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产品型号BMA150的概述

BMA150芯片概述及详细参数 一、芯片概述 BMA150是一款由德国博世(Bosch)公司制造的三轴加速度传感器,主要用于移动设备、穿戴设备、智能家居等领域。该芯片能够实现高精度、低功耗的运动检测,广泛应用于手机、平板电脑、智能手表和其他便携设备。BMA150不仅具有优良的灵敏度和线性度,还支持多种工作模式,适合在不同的应用场景中实现有效的加速度测量。其主要特性包括小型化设计、宽电压范围和强劲的抗干扰能力,使得该芯片在市场上颇具竞争力。 二、BMA150的详细参数 BMA150的技术规格如下: - 型号:BMA150 - 工作电压:1.2V至3.6V - 量程:±2g、±4g、±8g(可配置) - 灵敏度:每个量程的灵敏度分别为: - ±2g:16384 LSB/g - ±4g:8192 LSB/g - ±8g:4096 LSB/g - 分辨率:12位 - 噪声密度:2...

产品型号BMA150的Datasheet PDF文件预览

BMA150  
Digital, triaxial acceleration sensor  
Data sheet  
BMA150 Data s heet  
Order code(s)  
Package type  
Data sheet version  
Release date  
0 273 141 028 (non-halogen-free) and 0 273 141 043 (halogen-free)  
12-pin LGA  
1.5  
29 May 2008  
Notes  
Product photos and pictures are for illustration purposes only and may differ  
Specifications are subject to change without notice.  
from the real product’s appearance.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
BMA150  
Digital, triaxial 2g/ 4g/ 8g acceleration sensor  
Key features  
Three-axis accelerometer  
Temperature output  
Small package  
LGA package  
Footprint 3mm x 3mm, height 0.90mm  
SPI (4-wire, 3-wire), I²C, interrupt pin  
Programmable functionality g-range ±2g/±4g/±8g, bandwidth 25-1500Hz, internal  
acceleration evaluation for interrupt trigger also enabling  
stand-alone capability (without use of microcontroller),  
self-test  
Digital interface  
Ultra-low power ASIC  
Low current consumption, short wake-up time,  
advanced features for system power management  
RoHS compliant, Lead(Pb)-free  
Eco-friendly  
Halogen-free (part number 0 273 141 043 only)  
Typical applications  
HDD protection  
Menu scrolling, tap sensing function  
Gaming  
Pedometer/step-counting  
Drop detection for warranty logging  
Display profile switching  
Advanced system power management for mobile applications  
Shock detection  
General des cription  
The BMA150 is a triaxial, low-g acceleration sensor IC with digital output for consumer market  
applications. It allows measurements of acceleration in perpendicular axes as well as absolute  
temperature measurement.  
An evaluation circuitry converts the output of a three-channel micromechanical acceleration-  
sensing structure that works according to the differential capacitance principle.  
Package and interface have been defined to match a multitude of hardware requirements. Since  
the sensor IC has small footprint and flat package it is attractive for mobile applications. The  
sensor IC can be programmed to optimize functionality, performance and power consumption in  
customer specific applications.  
The BMA150 senses tilt, motion and shock vibration in cell phones, handhelds, computer  
peripherals, man-machine interfaces, virtual reality features and game controllers.  
The BMA150 is the LGA package version of the SMB380 triaxial acceleration sensor which is  
available in a 3mm x 3mm x 0.9mm QFN package.  
Rev. 1.5  
Page 2  
30 May 2008  
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such  
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Index of Contents  
1. SPECIFICATION...................................................................................................................................... 5  
2. MAXIMUM RATINGS ............................................................................................................................... 7  
3. GLOBAL MEMORY MAP .........................................................................................................................8  
3.1 OPERATIONAL REGISTERS ................................................................................................................... 11  
3.1.1 SPI4............................................................................................................................................ 11  
3.1.2 Range ......................................................................................................................................... 11  
3.1.3 Bandwidth................................................................................................................................... 12  
3.1.4 Wake_up .................................................................................................................................... 12  
3.1.5 Wake_up_pause ........................................................................................................................ 13  
3.1.6 Shadow_dis ................................................................................................................................ 13  
3.2 INTERRUPT SETTINGS .......................................................................................................................... 14  
3.2.1 Enable_LG: ................................................................................................................................ 14  
3.2.2 Enable_HG:................................................................................................................................ 14  
3.2.3 Enable_adv_INT: ....................................................................................................................... 14  
3.2.4 Any_motion: ............................................................................................................................... 14  
3.2.5 Alert:........................................................................................................................................... 14  
3.2.6 Latch_INT:.................................................................................................................................. 15  
3.2.7 LG_thres, LG_hyst, LG_dur, counter_LG .................................................................................. 15  
3.2.8 HG_thres, HG_hyst, HG_dur, counter_HG ............................................................................... 16  
3.2.9 Any_motion_thres, any_motion_dur .......................................................................................... 17  
3.2.10 New_data_int ........................................................................................................................... 19  
3.3 CONTROL REGISTERS .......................................................................................................................... 20  
3.3.1 Reset_INT .................................................................................................................................. 20  
3.3.2 Update_image ............................................................................................................................ 20  
3.3.3 Ee_w .......................................................................................................................................... 20  
3.3.4 Selftest_0 ................................................................................................................................... 21  
3.3.5 Selftest_1 ................................................................................................................................... 21  
3.3.6 Soft_reset................................................................................................................................... 21  
3.3.7 Sleep .......................................................................................................................................... 21  
3.4 STATUS REGISTERS ............................................................................................................................. 22  
3.4.1 St_result ..................................................................................................................................... 22  
3.4.2 Alert_phase ................................................................................................................................ 22  
3.4.3 LG_latched, HG_latched............................................................................................................ 22  
3.4.4 Status_LG, status_HG ............................................................................................................... 22  
3.4.5 Customer_reserved 1, customer_reserved 2 ............................................................................ 22  
3.5 DATA REGISTERS ................................................................................................................................ 23  
3.5.1 Temp .......................................................................................................................................... 23  
3.5.2 Acc_x, acc_y, acc_z................................................................................................................... 23  
3.5.3 New_data_x, new_data_y, new_data_z .................................................................................... 24  
3.5.4 Al_version, ml_version, chip_id ................................................................................................. 24  
Rev. 1.5  
Page 3  
30 May 2008  
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such  
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
4. DIGITAL INTERFACE............................................................................................................................ 25  
4.1 SPI..................................................................................................................................................... 25  
4.1.1 Four-wire SPI interface .............................................................................................................. 25  
4.1.2 Three-wire SPI interface ............................................................................................................ 29  
4.2 I²C INTERFACE .................................................................................................................................... 32  
4.2.1 I²C protocol:................................................................................................................................ 36  
5. PACKAGE.............................................................................................................................................. 38  
5.1 OUTLINE DIMENSIONS .......................................................................................................................... 38  
5.2 AXES ORIENTATION ............................................................................................................................. 39  
5.3 LANDING PATTERN RECOMMENDATIONS ............................................................................................... 40  
5.4 MOISTURE SENSITIVITY LEVEL AND SOLDERING ..................................................................................... 41  
5.5 ROHS COMPLIANCY ............................................................................................................................ 41  
5.6 NOTE ON INTERNAL PACKAGE STRUCTURE ........................................................................................... 41  
6. PIN-OUT OUT AND CONNECTION DIAGRAMS ................................................................................. 42  
7. OPERATION MODES ............................................................................................................................ 45  
7.1 NORMAL OPERATIONAL MODE.............................................................................................................. 45  
7.2 SLEEP MODE ....................................................................................................................................... 45  
7.3 WAKE-UP MODE .................................................................................................................................. 45  
8. DATA CONVERSION ............................................................................................................................ 50  
8.1 ACCELERATION DATA .......................................................................................................................... 50  
8.2 TEMPERATURE MEASUREMENT ............................................................................................................ 50  
9. INTERNAL LOGIC FUNCTIONS ........................................................................................................... 51  
9.1 FREEFALL LOGIC ................................................................................................................................. 51  
9.2 HIGH-G LOGIC ..................................................................................................................................... 51  
9.3 ANY MOTION DETECTION...................................................................................................................... 52  
9.4 ALERT MODE ...................................................................................................................................... 52  
10. LEGAL DISCLAIMER .......................................................................................................................... 53  
10.1 ENGINEERING SAMPLES ..................................................................................................................... 53  
10.2 PRODUCT USE................................................................................................................................... 53  
10.3 APPLICATION EXAMPLES AND HINTS ................................................................................................... 53  
11. DOCUMENT HISTORY AND MODIFICATION ................................................................................... 54  
Rev. 1.5  
Page 4  
30 May 2008  
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such  
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
1. Specification  
If not stated otherwise, the given values are maximum values over lifetime and full performance  
temperature/voltage range in the normal operation mode.  
Table 1: Operating range, output signal and mechanical specifications of BMA150  
Parameter  
Symbol  
Condition  
Min  
Typ  
Max  
Units  
OPERATING RANGE  
gFS2g  
gFS4g  
gFS8g  
VDD  
-2  
-4  
2
4
g
g
g
V
Switchable via serial  
digital interface  
Acceleration range  
-8  
8
Supply voltage  
analogue  
2.4  
3.6  
Supply voltage for  
digital I/O  
VDDIO  
IDD  
IDDsbm  
TA  
1.62  
3.6  
290  
2
V
VDDIO VDD  
Supply current in  
normal mode  
Digital and analog  
Digital and analog  
200  
1
µA  
µA  
°C  
Supply current in  
stand-by mode *  
Operating  
-40  
+85  
temperature  
ACCELERATION OUTPUT SIGNAL  
Acceleration output  
resolution  
Format:  
2’s complement  
10  
Bit  
S2g  
g-range ±2g  
246  
122 **  
61 **  
-60  
256  
128  
64  
266  
134 **  
67 **  
60  
LSB/g  
LSB/g  
LSB/g  
mg  
Sensitivity  
S4g  
S8g  
Off  
Off  
g-range ±4g  
g-range ±8g  
Zero-g offset  
Zero-g offset  
TA=25°C, calibrated  
TA=25°C , over  
lifetime ***  
-150  
150  
mg  
Zero-g offset  
Over TA  
1
mg/K  
temperature drift  
Power supply  
rejection ratio  
PSRR  
Over VDD  
0.2  
LSB/V  
* For more details on the BMA150’s current consumption during wake-up mode, please refer to chapter 7.2 & 7.3  
** Values here are given as indications for reference only  
*** The offset can deviate from the original calibration mainly due to stress effects during soldering depending on the  
soldering process. For many applications it is beneficial to re-calibrate the offset after PCB assembly (see application  
note ANA016 “In-line offset re-calibration”).  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Parameter  
Symbol  
Condition  
2nd order analog  
filter  
Min  
Typ  
Max  
Units  
Bandwidth  
bw  
1500  
Hz  
Digital filter *  
25, 50, 100,  
190, 375, 750  
Hz  
Hz  
Acceleration data  
f_rate  
2700  
-0.5  
3000  
3300  
0.5  
refresh rate (all axes)  
Nonlinearity  
Output noise  
NL  
Best fit straight line  
Rms  
%FS  
nrms  
0.5  
0.5  
mg/Hz  
TEMPERATURE SENSOR IC  
Sensitivity  
ST  
TS  
Preliminary data  
0.475  
-30  
0.525  
97.5  
K/LSB  
°C  
Temperature  
measurement range  
Temperature offset  
OffT  
Calibrated at 30°C  
1
K
MECHANICAL CHARACTERISTICS  
Cross axis sensitivity  
Relative  
contribution  
between 3 axes  
2
%
S
POWERING UP CHARACTERISTICS  
Wake-up time  
Start-up time  
twu  
tsu  
From stand-by  
From power-off  
1
3
1.5  
ms  
ms  
* Please refer to chapter 3.1.3 for more detailed explanations  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
2. Maximum ratings  
Table 2: Maximum ratings specified for the BMA150  
Parameter  
Condition  
VDD and VDDIO  
Min  
Max  
Units  
Supply Voltage  
-0.3  
4.25  
V
Storage Temperature range  
EEPROM write cycles  
EEPROM retention  
-50  
1000  
10  
+150  
°C  
cycles  
years  
g
Same Byte  
At 55°C, after 1000 cycles  
Duration 100µs  
Duration 1.0ms  
Free fall onto hard surfaces  
HBM, at any pin  
CDM  
10,000  
2,000  
1.5  
Mechanical Shock  
ESD  
g
m
2
kV  
500  
V
Note:  
Stress above these limits may cause damage to the device. Exceeding the specified electrical  
limits may affect the device reliability or cause malfunction.  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3. Global memory map  
The global memory map of BMA150 has three levels of access:  
Memory Region  
Operational  
Registers  
Default Setting  
Registers  
Content  
Acces s Level  
Direct access via serial interface  
Data registers, control registers,  
status registers, interrupt settings  
Default values for operational  
registers, acceleration and  
temperature trimming values  
Access blocked by default;  
Access enabled by setting control  
bit in operational registers via  
serial interface  
Bosch Sensortec  
Internal trimming registers  
Protected  
Reserved Registers  
The memory of BMA150 is realized in diverse physical architectures. Basically BMA150 uses  
volatile memory registers to operate. The volatile part of the memory can be changed and read  
quickly. Part of the volatile memory (“image”) is a copy of the non-volatile memory (EEPROM).  
The EEPROM can be used to set default values for the operation of the sensor IC. The  
EEPROM is write only. The register values are copied to the image registers after power on or  
soft reset. The download of all EEPROM bytes to image registers is also done when the content  
of one EEPROM byte has been changed by a write command.  
All operational and default setting registers are accessible through serial interface with a  
standard protocol:  
Type of  
Regis ter  
Data  
Function of Regis ter  
Command  
Volatile / non-volatile  
Read  
Read  
Read / Write  
non-volatile (hard coded)  
volatile  
Chip identification, chip version  
Acceleration data, temperature  
Activating self test, soft reset,  
switch to sleep mode etc.  
Interrupt status and self test  
status  
Registers  
Control  
Registers  
Status  
volatile  
Read  
Volatile  
Registers  
Read / Write  
Read / Write  
volatile  
volatile  
Customer usable status bytes  
Functional settings (range,  
bandwidth)  
Setting  
Register  
Read / Write  
Write  
volatile  
non-volatile  
Interrupt settings  
EEPROM  
Default settings of functional  
and interrupt settings  
Trimming values  
Customer reserved data  
storage  
Write  
Write  
non-volatile  
non-volatile  
Write  
non-volatile  
Bosch Sensortec Reserved  
Memory  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Figure 1: Global memory map of BMA150  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Important notes :  
1) Bits 5, 6 and 7 of register addresses 14h and 34h do contain critical sensor individual  
calibration data which must not be changed or deleted by any means.  
In order to properly modify addresses 14h and/or 34h for range and/or bandwidth selection  
using bits 0, 1, 2, 3 and 4, it is highly recommended to read-out the complete byte, perform bit-  
slicing and write back the complete byte with unchanged bits 5, 6 and 7.  
Otherwise the reported acceleration data may show incorrect results.  
2) Bit 7 of register 0Ah should be left at a value of “0”.  
3) A minimum pause of 14msec. between two consecutive EEPROM write-cycles must be kept.  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.1 Operational regis ters  
3.1.1 SPI4  
The SPI4 bit ((address 15h, bit 7) is used to select the correct SPI protocol (three-wire or four-  
wire, SPI-mode 3). The default value stored in the non-volatile part of the memory is SPI4=1  
(four-wire SPI is default value !). After power on reset or soft reset or writing to EEPROM the  
SPI4 EEPROM setting (35h) is downloaded to the image register SPI4 and the corresponding  
SPI protocol is selected.  
If the desired SPI is three-wire, the microcontroller must first write SPI4 to 0 (in image register  
only or in EEPROM). This first writing is possible because only CSB, SCK and SDI are required  
for a write sequence and the 3 bit timing diagrams are identical in three-wire and four-wire  
configuration.  
Since EEPROM has limited write cycle lifetime (minimum 1000 cycles specified) it is  
recommended to use one of the following procedures.  
Procedure 1 (recommended): Set SPI4 in image to correct value (SPI4=0 for SPI three-wire,  
SPI4=1 for SPI four-wire (=default)) every time after power on reset, soft reset or  
EEPROM write command.  
Procedure 2: Verify chip-ID (address 00h) after every power on reset, soft reset or EEPROM  
write command to be chip_ID=02h. If chip_ID=FFh or chip_ID=00h unlock  
EEPROM (section 3.3.3) and set SPI4 to correct interface in EEPROM at 35h.  
Lock EEPROM. Optionally verify chip_ID after delay of >30ms.  
Procedure 3: Set SPI4 once to correct interface in the EEPROM at 35h during final test  
procedure at customer.  
3.1.2 Range  
These two bits (address 14h, bits 4 and 3) are used to select the full scale acceleration range.  
Directly after changing the full scale range it takes 1/(2*bandwidth) to overwrite the data  
registers with filtered data according to the selected bandwidth.  
Table 3: Settings of full scale range register  
range<1:0>  
Full s cale acceleration range  
00  
01  
10  
11  
+/- 2g  
+/- 4g  
+/- 8g  
Not authorised code  
Important note:  
Please refer to the comment in chapter 3 of how to protect bits 5, 6 and 7 when modifying other  
bits of register 14h.  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.1.3 Bandwidth  
These three bits (address 14h, bits 2-0) are used to setup the digital filtering of ADC output data  
to obtain the desired bandwidth. A second order analogue filter defines the max. bandwidth to  
1.5kHz. Digital filters can be activated to reduce the bandwidth down to 25Hz in order to reduce  
signal noise. The digital filters are moving average filters of various length with a refresh rate of  
3kHz.  
Since the bandwidth is reduced by a digital filter for the factor ½ , ¼, ... of the analogue filter  
frequency of 1.5kHz the mean values of the bandwidth are slightly deviating from the rounded  
nominal values. Table 4 shows the corresponding data:  
Table 4: Settings of bandwidth  
Nominal s elected bandwidth  
Mean  
bandwidth<2:0>  
[Hz]  
Min.  
bandwidth[Hz]  
Max.  
000  
001  
010  
011  
100  
101  
110  
111  
25  
50  
100  
190  
375  
750  
1500  
23  
47  
94  
188  
375  
750  
1500  
-
Not authorised code  
-
-
At wake-up from sleep mode to normal operation, the bandwidth is set to its maximum value  
and then reduced to bandwidth setting as soon as enough ADC samples are available to fill the  
whole digital filter.  
Important note:  
Please refer to the comment in chapter 3 of how to protect bits 5, 6 and 7 when modifying other  
bits of register 14h.  
3.1.4 Wake_up  
This bit (address 15h, bit 0) makes BMA150 automatically switching from sleep mode to normal  
mode after the delay defined by wake_up_pause (section 3.1.5). When the sensor IC goes from  
sleep to normal mode, it starts acceleration acquisition and performs interrupt verification  
(section 3.2). The sensor IC automatically switches back from normal to sleep mode again if no  
fulfilment of programmed interrupt criteria has been detected. The IC wakes-up for a minimum  
duration which depends on the number of required valid acceleration data to determine if an  
interrupt should be generated.  
If a latched interrupt is generated, this can be used to wake-up a microprocessor. The sensor IC  
will wait for a reset_INT command and restart interrupt verification. BMA150 can not go back to  
sleep mode if reset_INT is not issued after a latched interrupt.  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
If a not-latched interrupt is generated, the device waits in the normal mode till the interrupt  
condition disappears. The minimum duration of interrupt activation is 330µs. If no interrupt is  
generated, the sensor IC goes to sleep mode for a defined time (wake_up_pause).  
For more details on the wake-up functionality, please refer to chapter 7.3  
3.1.5 Wake_up_pause  
These bits (address 15h, bit 2 and 1) define the sleep phase duration between each automatic  
wake-up.  
Table 5: Settings of wake_up_pause  
wake_up_paus e<1:0>  
Sleep phas e duration  
20 ms  
00  
01  
10  
11  
80 ms  
320 ms  
2560 ms  
Note: The accuracy of the wake-up timer is about ±30%.  
3.1.6 Shadow_dis  
BMA150 provides the possibility to block the update of data MSB while LSB are read out. This  
avoids a potential mixing of LSB and MSB of successive conversion cycles. When this bit  
(address 15h, bit 3) is at 1, the blocking procedure for MSB is not realized and MSB only  
reading is possible.  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.2 Interrupt s ettings  
Five different types of interrupts can be programmed. When the corresponding criterion  
becomes valid, the interrupt pin is triggered to a high level. All interrupt criteria are combined  
and drive the interrupt pad with an Boolean <OR> condition.  
Interrupt generations may be disturbed by changes of EEPROM, image or other control bits  
because some of these bits influence the interrupt calculation. As a consequence, no write  
sequence should occur when microprocessor is triggered by interrupt or the interrupt should be  
deactivated on the microprocessor side when write sequences are operated.  
Interrupt criteria are using digital code coming from digital filter output. As a consequence all  
thresholds are scaled with range selection (section 3.1.3.2). Timings used for high acceleration  
and low acceleration debouncing are absolute values (1 LSB of HG_dur and LG_dur registers  
corresponds to 1 millisecond, timiming accuracy is proportional to oscillator accuracy = +/-10%),  
thus it does not depend on selected bandwidth. Timings used for any motion interrupt and alert  
detection are proportional to bandwidth settings (section 3.1.3).  
3.2.1 Enable_LG:  
This bit (address 0Bh, bit 0) enables the LG_thres criteria to generate an interrupt.  
3.2.2 Enable_HG:  
This bit (address 0Bh, bit 1) enables the HG_thres criteria to generate an interrupt.  
3.2.3 Enable_adv_INT:  
This bit (address 15h, bit 6) is used to disable advanced interrupt control bits (any_motion,  
alert). If enable_adv_INT=0, writing to these bits has no effect on sensor IC function.  
3.2.4 Any_motion:  
This bit ((address 0Bh, bit 6)enables the any motion criteria to generate directly an interrupt. It  
can not be turned on simultaneously with alert. This bit can be masked by enable_ adv_INT, the  
value of this bit is ignored when enable_adv_INT=0 (section 3.2.3).  
3.2.5 Alert:  
If this bit (address 0Bh, bit 7) is at 1, the any_motion criterion will set BMA150 into alert mode  
(section 3.2.9). This bit can be masked by enable_adv_INT, the value of this bit is ignored when  
enable_adv_INT=0 (section 3.2.3).  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.2.6 Latch_INT:  
If this bit (address 15h, bit 4) is at 1, interrupts are latched. The INT pad stays high until  
microprocessor detects it and writes reset_INT control bit to 1 (section 3.3.1). When this bit is at  
0, interrupts are set and reset directly by BMA150 according to programmable criteria (sections  
3.2.7 and 3.2.8).  
3.2.7 LG_thres, LG_hyst, LG_dur, counter_LG  
LG_thres (address 0C, bits 7-0 / low-g threshold) and LG_hyst (address 11h, bits 2-0 / low-g  
threshold hysteresis) are used to detect a free fall. The threshold and duration codes define one  
criterion for interrupt generation when absolute value of acceleration is low for long enough  
duration.  
Data format is unsigned integer.  
LG_thres criterion_x is true if  
LG_thres interrupt is set if  
|acc_x | LG_thres / 255 * range  
(LG_thres criterion_x AND LG_thres criterion_y AND  
LG_thres criterion_z) AND interrupt counter = (LG_dur+1)  
LG_thres criterion_x is false if  
LG_thres interrupt is reset if  
|acc_x | > (LG_thres + 32*LG_hyst) / 255 * range  
NOT(LG_thres criterion_x AND LG_thres criterion_y AND  
LG_thres criterion_z)  
LG_thres and LG_hyst codes must be chosen to have (LG_thres + 32*LG_hyst) < 511.  
When LG_thres criterion becomes active, an interrupt counter is incremented by 1 LSB/ms.  
When the low-g interrupt counter value equals (LG_dur+1), an interrupt is generated.  
Depending on counter_LG (address 0Bh, bit 3 and 2) register, the counter could also be reset  
or count down when LG_thres criterion is false.  
Table 6: Description of debouncing counter counter_LG  
counter_LG<1:0> low acceleration interrupt counter s tatus when  
LG_thres criteria is fals e  
00  
01  
10  
11  
reset  
Count down by 1 LSB/ms  
Count down by 2 LSB/ms  
Count down by 3 LSB/ms  
If latch_INT=0, the interrupt is not a latched interrupt and then it is reset as soon as LG_thres  
criteria becomes false. When interrupt occurs, the interrupt counter is reset.  
The LG_thres criteria is set with an AND condition on all three axes to be used for free fall  
detection.  
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BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.2.8 HG_thres, HG_hyst, HG_dur, counter_HG  
HG_thres (address 0Eh, bits 7-0 / high-g threshold) and HG_hyst (address 11h, bits 5-3 / high-g  
threshold hysteresis) define the high-G level and its associated hysteresis. HG_dur (high-g  
threshold qualification duration) and counter_HG (address 0Bh, bits 5 and 4 / high-g counter  
down register) are used for debouncing the high-g criteria.  
Threshold and duration codes define a criterion for interrupt generation when absolute value of  
acceleration is high for long enough duration.  
The data format is unsigned integer.  
HG_threshold criterion_x is true if |acc_x | HG_thres / 255 * range  
HG_threshold interrupt is set if  
(HG_thres criterion_x OR HG_thres criterion_y OR  
HG_thres criterion_z) AND interrupt counter = (HG_dur+1)  
HG_threshold criterion_x is false if |acc_x | < (HG_thres - 32*HG_hyst) / 255 * range  
HG_threshold interrupt is reset if  
NOT(HG_thres criterion_x OR HG_thres criterion_y OR  
HG_thres criterion_z)  
HG_thres and HG_hyst codes must be chosen to have (HG_thres - 32*HG_hyst) > 0.  
When HG_thres criterion becomes active, a counter is incremented by 1 LSB/ms. When the  
high-g acceleration interrupt counter value equals (HG_dur+1), an interrupt is generated.  
Depending on counter_HG register value, the counter could also be reset or count down when  
HG_thres criterion is false.  
Table 7: Description of debouncing counter_HG  
counter_HG<1:0> High acceleration interrupt counter s tatus when  
HG_thres criterion is fals e  
00  
01  
10  
11  
reset  
Count down by 1 LSB/ms  
Count down by 2 LSB/ms  
Count down by 3 LSB/ms  
If latch_INT=0, the interrupt is not a latched interrupt and then it is reset as soon as HG_thres  
criterion becomes false. When interrupt occurs, the interrupt counter is reset.  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.2.9 Any_motion_thres, any_motion_dur  
For the evaluation using “any motion” criterion successive acceleration data from digital filter  
output are stored and moving differences for all axes are built. To calculate the difference the  
acceleration values of all axes at time t0 are compared to values at t0+3/(2*bandwidth). The  
difference of both values is equal to the difference of two successive moving averages (from  
three data points).  
The differential value is compared to a global critical threshold any_motion_thres (address 10h,  
bits 7-0). Interrupt can be generated when the absolute value of measured difference is higher  
than the programmed threshold for long enough duration defined by any_motion_dur (address  
11h, bits 7 and 6).  
Any_motion_thres and any_motion_dur data are unsigned integer. Any_motion_thres LSB size  
corresponds to 15.6mg for +/- 2g range and scales with range selection (section 3.1.2).  
Any motion criterion is valid if  
An interrupt is set if  
|acc(t0)-acc(t0+3/(2*bandwidth))| any_motion_thres.  
(any motion criterion_x OR any motion criterion_y OR any  
motion criterion_z) for any_motion_dur consecutive times.  
The any motion interrupt is reset if NOT(any_motion criterion_x OR any_motion criterion_y OR  
any_motion criterion_z) for any_motion_dur consecutive  
times.  
Table 8: any_motion_dur settings  
any_motion_dur<1:0>  
Number of required cons ecutive conditions  
to s et or res et the any motion interrupt  
00  
01  
10  
11  
1
3
5
7
Any_motion_dur is used to filter the motion profile and also to define a minimum interrupt  
duration because the reset condition is also filtered.  
Any_motion_thres can be used to generate an any_motion interrupt or to put BMA150 in alert  
mode to preload the low-g or high-g threshold logic (enables reduction of reaction time in  
tumbling mode); this is selected by alert bit (section 3.2.5). These two modes (any_motion and  
alert) can not be turned on simultaneously.  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Figure 2: Any motion criterion (middle graph) is determined from digital filter output (upper  
graph) and depends on bandwidth settings: for example for any_motion_dur=01b and  
bandwidth=110b (1.5kHz), we have 2*bandwidth=3ksamples/s which leads to reaction for  
interrupt activation of 3*333µs = 1ms and a minimum any motion interrupt duration of 3*333us =  
1ms (see lower graph).  
If lower bandwidth is selected i) the digitally filtered values (lower noise) are taken for the  
verification of the any motion criterion and ii) the time scale to evaluate the criterion is stretched.  
Thus adjusting the bandwidth, the any motion threshold, the any motion duration as well as the  
full scale range enables to tailor the sensitivity of the any motion algorithm.  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.2.10 New_data_int  
If this bit (address 15h, bit 5) is set to 1, an interrupt will be generated when all three axes  
acceleration values are new, i.e. BMA150 updated all acceleration values after latest serial  
read-out. Interrupt generated from new data detection is a latched one; microcontroller has to  
write reset_INT at 1 after interrupt has been detected high (section 3.3.1). This interrupt is also  
reset by any acceleration byte read procedure (read access to address 02h to 07h).  
New data interrupt always occurs at the end of the Z-axis value update in the output register  
(3kHz rate). Following figure shows two examples of X-axis read out and the corresponding  
interrupt generation.  
Figure 3: Explanation of new data interrupt.  
left side - read out command of x-axis prior to next x-axis conversion  
new data interrupt after completion of current conversion cycle after z-axis  
conversion  
right side - read out of x-axis send after x-axis conversion  
new data interrupt at the end of next period when x axis has been updated  
T
X
Y
Z
T
X
Y
Z
T
X
Y
X
Y
Z
T
X
Y
Z
T
X
Y
Z
X-axis value read out  
X-axis value read out  
New data interrupt  
New data interrupt  
Please refer to chapter 8.1 for more details.  
Note: When using the I2C interface for data transfer, the data read out phase can be longer than  
330µs (depending on I2C clock frequency and the amount of data transmitted). Starting a new  
data read out sequence may lead to the situation that the new_data_int may not be cleared right  
in time. This must be considered and taken care of properly.  
Rev. 1.5  
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as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.3 Control regis ters  
All single control bits are active at 1.  
3.3.1 Reset_INT  
This interrupt (address 0Ah, bit 6) is reset (interrupt pad goes to low) each time this bit is written  
to 1.  
3.3.2 Update_image  
When this bit (address 0Ah, bit 5) is set at 1, an image update procedure is started: all  
EEPROM content is copied to image registers. The bit update_image is turned at 0 when the  
procedure is finished. No write or read to image registers and EEPROM write is allowed during  
their update from EEPROM. An automatic update image procedure also occurs after power on  
reset and after soft_reset has been written to 1.  
The update_image procedure may overwrite the SPI4 setting (section 3.1.1). Thus the correct  
interface configuration may have to be updated.  
3.3.3 Ee_w  
ee_w (address 0Ah, bit 4) is used to enable/disable the access to default setting registers.  
This bit must first be written to 1 to enable write access to 16h to 3D and to enable read access  
to 16h to 22h. When this bit is at 0, any access to addresses from 16h to 7Fh has no effect; any  
read to these addresses set SDO to tri-state (4-wire SPI) or SDI to tri-state (3-wire SPI and I²C).  
This is valid for all serial interface (I²C, SPI 3-wire or SPI 4-wire).  
I²C acknowledgement procedure for access to non-protected or blocked memory regions:  
- I²C slave address:  
- I²C register address (I²C write):  
if correct, the BMA150 sets acknowledge.  
The BMA150 sets acknowledge for both unprotected and  
protected registers.  
- I²C write data (I²C write):  
- I²C read data (I²C read):  
The BMA150 sets acknowledge for both unprotected and  
protected resisters; no write is done for protected register.  
acknowledge is set by master; no error detection is  
possible; SDI is set to Hi-Z for protected register (0xFF is  
sent)  
After power on reset ee_w=0. So EEPROM and all addresses from 16h to 7Fh can not be  
directly written or read.  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.3.4 Selftest_0  
The self-test command (address 0Ah, bit 2) uses electrostatic forces to move the MEMS  
common electrode. The result from selftest can be verified by reading st_result (section 3.4.1).  
During selftest procedurno external change of the acceleration should be generated.  
3.3.5 Selftest_1  
This self test bit (address 0Ah, bit3) does not generate any electrostatic force in the MEMS  
element but is used to verify the interrupt function is working correctly and that microprocessor  
is able to react to the interrupts.  
0g acceleration is emulated at ADC input and the user can detect the whole logic path for  
interrupt, including the PCB path integrity. The LG_thres register must be set to about 0.4g  
while LG_dur = 0 to generate a low-g interrupt  
3.3.6 Soft_reset  
BMA150 is reset each time this bit (address 0Ah, bit 1) is written to 1. The effect is identical to  
power-on reset. Control, status and image registers are reset to values stored in the EEPROM.  
After soft_reset or power-on reset BMA150 comes up in normal mode or wake-up mode. It is  
not possible to boot BMA150 to sleep mode.  
No serial transaction should occur within 10us after soft_reset command.  
The soft_reset procedure may overwrite the SPI4 setting (section 3.1.1). Thus the correct  
interface configuration may have to be updated.  
3.3.7 Sleep  
This bit (address 0Ah, bit 0) turns the sensor IC in sleep mode. Control and image registers are  
not cleared.  
When BMA150 is in sleep mode no operation can be performed but wake-up the sensor IC by  
setting sleep=0 or soft_reset. As a consequence all write and read operations are forbidden  
when the sensor IC is in sleep mode except command used to wake up the device or soft_reset  
command. After sleep mode removal, it takes 1ms to obtain stable acceleration values (>99%  
data integrity). User must wait for 10ms before first EEPROM write. For the same reason,  
BMA150 must not be turned in sleep mode when any update_image, self_test or EEPROM  
write procedure is on going.  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.4 Status regis ters  
3.4.1 St_result  
This is the self test result bit (address 09h, bit 7). It can be used together with selftest_0 control  
bit (section 3.3.4). After selftest_0 has been set, self-test procedure starts. At the end selftest_0  
is written to 0 and microcontroller can react by reading st_result bit. When st_result=1 the self  
test passed successfully.  
The result of the st_result can be taken into account to evaluate the basic function of the sensor.  
Note: Evaluation of the st_result bit should only be understood as one part of a wider  
functionality test. It should not be taken into consideration as the only criterion.  
3.4.2 Alert_phase  
This status bit (address 09h, bit 4) is set when BMA150 has been set to alert mode (section  
3.2.5) and an any motion criterion has been detected. During alert phase, HG_dur and LG_dur  
variables are decreased to have a smaller reaction time when HG_thres and LG_thres  
thresholds are crossed; the decrease rate is by 1 ms per ms.  
The alert mode is reset when an interrupt generated due to a high threshold or a low threshold  
event or when both HG_dur and LG_dur variables are at 0. When alert is reset, HG_dur and  
LG_dur variables come back to their original values stored in image registers.  
3.4.3 LG_latched, HG_latched  
These status bits (address 09h, bit 3 and address 09h, bit 2) are set when the corresponding  
criteria have been issued. They are latched and thus only the microcontroller can reset them.  
When both high acceleration and low acceleration thresholds are enabled, these bits can be  
used by microprocessor to detect which criteria generated the interrupt.  
3.4.4 Status_LG, status_HG  
These status bits (address 09h, bit 1 and address 09h, bit 2) are set when the corresponding  
criteria have been issued; they are automatically reset by BMA150 when the criteria disappear.  
3.4.5 Customer_reserved 1, customer_reserved 2  
Both bytes (address 12h, bit 7-0 and address 13h, bit 7-0) can be used by customer. Writing or  
reading of these registers has no effect on the sensor IC functionality.  
If information has to be stored in a non-volatile memory addresses 32h and 33h have to be  
used. The write access to EEPROM takes ca. 30ms. Since EEPROM has limited write cycle  
lifetime special care has to be taken to this issue.  
Rev. 1.5  
Page 22  
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as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
3.5 Data regis ters  
3.5.1 Temp  
A thermometer (address 08h, bit 7-0) is embedded in BMA150. Temperature resolution is  
0.5°C/LSB. Code 00h stands for lowest temperature which is -30°C. This minimum value can be  
corrected by trimming of the offset of the temperature sensor IC (not described in this  
datasheet).  
3.5.2 Acc_x, acc_y, acc_z  
Acceleration values are stored in the following registers to be read out through serial interface.  
acc_x (02h, 7-6; 03h, 7-0)  
acc_y (04h, 7-6; 05h, 7-0)  
acc_z (06h, 7-6; 07h, 7-0)  
The description of the digital signals acc_x, acc_y and acc_z is “2’s complement”.  
From negative to positive accelerations, the following sequence for the 2g measurement range  
can be observed ( 4g and 8g correspondingly):  
-2.000g  
-1.996g  
...  
:
:
10 0000 0000  
10 0000 0001  
-0.004g  
0.000g  
+0.004g  
...  
:
:
11 1111 1111  
:00 0000 0000  
00 0000 0001  
+1.992g  
+1.996g  
:
:
01 1111 1110  
01 1111 1111  
Data is periodically updated (rate 3kHz) with values from the digital filter output. LSB  
acceleration bytes must be read first. After an acceleration LSB byte read access, the  
corresponding MSB byte update can optionally be blocked until it is also accessed for read.  
Thus, MSB / LSB mix from different samples can be avoided (section 3.1.6).  
It is not possible to read-out only MSB bytes if shadow_dis=0, an LSB byte must first be read  
out. To be able to read out only MSB byte, shadow_dis must be written to 1.  
new_data_* flags on bits 0 of acc_x (LSB), acc_y (LSB) and acc_z (LSB) can be used to detect  
if acceleration values have already been read out (section 3.5.3).  
If systematic acceleration values read out is planned (for signal processing by the  
microcontroller), the interrupt pad can be programmed to flag the new data (section 3.2.10).  
Every time all temperature plus three axes values have been updated, the interrupt goes high  
and microcontroller can read out data. With this method, microcontroller accesses are  
synchronized with internal sensor IC updates.  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Synchronization of read-out sequence has several advantages:  
it enables a constant phase shift between acceleration conversion and its corresponding  
digital value read by microprocessor  
it reduces interface communication by avoiding over-sampling.  
potential noise due to serial interface activity perturbation would always be generated  
during a less critical phase of the conversion cycle. The maximum delay advised to start  
read out acceleration data is 20µs after INT high (window 0 - 80µs).  
3.5.3 New_data_x, new_data_y, new_data_z  
These bits (New_data_x (02h, 0), new_data_y (04h, 0), new_data_z (06h, 0)) are flags which  
are turned at 1 when acceleration registers have been updated. Reading acceleration data MSB  
or LSB registers turns the flags at 0. The flag value can be read by microprocessor.  
3.5.4 Al_version, ml_version, chip_id  
al_version (address 01h, bit 7-4) and ml_version (address 01h, bit 3-0) are used to identify the  
chip revision. These codes are programmed with metal layer.  
chip_id (address 00h, bit 2-0) is used by customer to be able to recognize BMA150. This code is  
fixed to 010b.  
Rev. 1.5  
Page 24  
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as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
4. Digital interface  
BMA150 is capable to be adjusted to customer’s specific hardware requirements. It provides  
three different digital interfaces (SPI 4-wire, SPI 3-wire, I²C) and an interrupt output pin.  
The digital interface is used for regular reading of data registers (acceleration and temperature).  
For a complete read out of acceleration data two successive read cycles are required. The 10  
bit coded data word is split into 8 MSB and 2 LSB. The most significant bit (MSB) is transferred  
first during address and data phases.  
The serial interface is also used for verifying status registers or writing to control registers or  
customized EEPROM programming.  
4.1 SPI  
The SPI interfaces using three wire or four wire bus provide 16-bit protocols. Multiple read out is  
possible.  
The communication is opened with a read/write control bit (R/W=0 for writing, R/W=1 for  
reading) followed by 7 address bits and at least 8 data bits (see figure 6 and figure 7). For a  
complete readout of 10 bit acceleration data from all axes the sensor IC provides the option to  
use an automatic incremented read command to read more than one byte (multiple read). This  
is activated when the serial enable pin CSB (chip select) stays active low after the read out of a  
data register. Thus, read out of data LSB will also cause read out of MSB if the CSB stays low  
for further 8 cycles of system clock.  
The customer has the possibility to communicate with operational registers at addresses 00h-  
15h via SPI interface (chip identification Bytes, data Bytes, status and control registers with  
setting parameters). Access to the residual part of the memory map is locked (section 3.3.3). If  
the master addresses outside the range 00h-15h then SDI will go to tri-state enabling the  
communication of a second device on the same CSB and SDI line.  
The CSB input has an internal 120kpull-up resistor to VDDIO  
.
4.1.1 Four-wire SPI interface  
The 4-wire SPI is the default serial interface. The customer can easily activate the 3-wire SPI by  
writing a control bit (SPI4=0). The 4-wire SPI interface uses SCK (serial clock), CSB (chip  
select), SDI (serial data in) and SDO (serial data out).  
CSB is active low. Data on SDI is latched by BMA150 at SCK rising edge and SDO is changed  
at SCK falling edge (SPI mode 3). Communication starts when CSB goes to low and stops  
when CSB goes to high; during these transitions on CSB, SCK must be high. While CSB=1, no  
SDI change is allowed when SCK=1.  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Figure 4: Timing diagram for four-wire SPI interface  
T_setup_csb_4  
T_hold_csb_4  
CSB  
SCK  
SDI  
T_low_sck_4 T_high_sck_4  
T_setup_sdi_4  
T_hold_sdi_4  
SDO  
T_delay_sdo_4  
Figure 5: Four wire SPI bit transfer  
CSB  
SCK  
SDI  
RW AD6 AD5 AD4 AD3 AD2 AD1 AD0 DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0  
SDO  
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0  
tri-state  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Table 9: Specification of four-wire SPI serial interface  
Interface parameters :  
Conditions  
Min.  
0.7*VDDIO  
1.4  
Typ.  
Max.  
unit  
V
Input - low level  
Input - high level  
Vil_si  
Vih_si  
VDDIO=1.62V to 3.6V  
VDDIO=1.62V to 3.6V  
VDDIO=1.8V, iol=3 mA  
VDDIO=1.8V, ioh=1mA  
For 10MHz SPI transfer  
0.3*VDDIO  
V
Output – low level Vol_SDI  
Output – high level Voh_SDI  
0.4  
V
V
Load capacitor  
Csdo_spi  
25  
pF  
kΩ  
(on SDO)  
CSB  
pull-up resistor  
Internal pull-up  
resistance to VDDIO  
CSB_pull_up  
70  
120  
190  
4-wire SPI timings :  
SPI clock  
input frequency  
Fspi_4  
10  
MHz  
ns  
SCK low pulse  
SCK high pulse  
SDI setup time  
SDI hold time  
Tlow_sck_4  
Thigh_sck_4  
Tsetup_sdi_4  
Thold_sdi_4  
5
5
5
5
ns  
ns  
ns  
SDO output delay Tdelay_sdo_4  
25  
ns  
CSB setup time  
CSB hold time  
Tsetup_csb_4  
Thold_csb_4  
5
5
ns  
ns  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Figure 6: When write is required, sequences of 2 bytes are necessary: 1 control byte to define  
the address to be written and the data byte.  
Control byte  
Data byte  
Control byte  
Data byte  
Register adress (16h)  
Data register - adress 1Eh  
Register adress (0Bh)  
Data register - adress 02h  
RW  
0
RW  
0
Stop  
Start  
CSB  
=
CSB  
=
0
0
1
0
1
1
0
X
X
X
X
X
X
X
X
0
0
0
1
0
1
1
X
X
X
X
X
X
X
X
0
1
Figure 7: When read access is required, the sequence consists of 1 control byte to define first  
address to be read followed by data bytes. Addresses are automatically incremented as long as  
CSB stays active low.  
Control byte  
Data byte  
Data byte  
Data byte  
Register adress (02h)  
Data register - adress 02h  
Data register - adress 03h  
Data register - adress 04h  
Start RW  
CSB  
Stop  
CSB  
=
=
0
1
0
0
0
0
0
1
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
4.1.2 Three-wire SPI interface  
3-wire SPI is not the default serial interface. The customer can easily activate the 3-wire SPI by  
setting a control bit (SPI4=0). The 3-wire SPI interface uses SCK (serial clock), CSB (chip  
select, active low) and SDA (serial data in/out). A maximum clock frequency up to 70MHz can  
be handled.  
The protocol data acquisition by the sensor IC occurs at the rising edge of SCK. The output data  
provided by the sensor IC is synchronized also on the rising edges of SCK. The 3-wire read  
protocol needs one extra clock cycle between address byte and data output byte.  
Figure 8: Timing diagram for three-wire SPI interface (SDI = SDA)  
T_setup_csb_3  
T_hold_csb_3  
CSB  
T_hold_sdi_3  
T_delay_sdi_3  
0
T_low_sck_3  
T_high_sck_3  
6
T_setup_sdi_3  
7
Xtra  
5
4
3
7
2
1
6
5
4
3
2
1
0
SCK  
SDI  
r
A6  
A5  
A4  
A3  
A2  
A1  
A0  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
T_delay_sdi_3  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Table 10: Specification of three-wire SPI serial interface  
Conditions  
Min.  
Typ.  
Max.  
unit  
V
Input - low level  
Input - high level  
Output – low level  
Output – high level  
Vil_si  
VDDIO=1.62V to 3.6V  
0.3*VDDIO  
Vih_si  
VDDIO=1.62V to 3.6V 0.7*VDDIO  
DDIO=1.8V,  
V
V
Vol_SDI  
Voh_SDI  
0.4  
V
iol=3 mA  
VDDIO=1.8V, ioh=1mA  
1.4  
70  
V
Internal pull-up  
resistance to VDDIO  
for 70MHz  
CSB pull-up resistor CSB_pull_up  
120  
190  
10  
kΩ  
pF  
Load capacitor  
Csdo_spi  
(on SDO)  
SPI transfer  
3-wire SPI timings :  
SPI clock  
input frequency  
Fspi_3  
70  
MHz  
ns  
SCK low pulse  
SCK high pulse  
SDI setup time  
SDI hold time  
Tlow_sck_3  
Thigh_sck_3  
Tsetup_sdi_3  
Thold_sdi_3  
Tdelay_sdi_3  
Tsetup_csb_3  
Thold_csb_3  
5
5
ns  
3.8  
2
ns  
ns  
when SDI  
is an output for read  
SDI output delay  
CSB setup time  
CSB hold time  
10.5  
ns  
5
5
ns  
ns  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Figure 9: The three wire SPI write protocol is identical to four wire bus  
CSB  
SCK  
SDI  
RW AD6 AD5 AD4 AD3 AD2 AD1 AD0 DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0  
Figure 10: For three wire read protocol one extra clock between address byte and data out byte  
is required. Output data are changed on SDI (SDI=SDA) by SCK rising edge and should be  
latched by microprocessor during next SCK rising edge.  
CSB  
extra clock  
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
*
SCK  
SDI  
RW AD6 AD5 AD4 AD3 AD2 AD1 AD0  
DO7  
DO6 DO5 DO4 DO3 DO2 DO1 DO0  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
4.2 I²C interface  
The I²C bus uses SCK (serial clock) and SDA (=SDI, serial data input/output). SDA is bi-  
directional with open drain; it must be connected externally to VDDIO via a pull-up resistor. CSB is  
not used and must be connected to VDDIO  
.
Figure 11: Timing diagram for I²C interface (SDI=SDA)  
SDI  
tBUF  
tf  
tLOW  
SCK  
tHIGH  
tHDSTA  
tr  
tHDDAT  
tSUDAT  
SDI  
tSUSTA  
tSUSTO  
Rev. 1.5  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Table 11: Specification of I²C serial interface (SDI=SDA)  
Interface parameters :  
Input - low level  
Conditions  
Min.  
0.7*VDDIO  
1.4  
Typ.  
Max.  
unit  
V
Vil_si  
VDDIO=1.62V to 3.6V  
VDDIO=1.62V to 3.6V  
0.3*VDDIO  
Input - high level  
Vih_si  
V
Output – low level  
Output – high level  
Vol_SDI VDDIO=1.8V, iol=3 mA  
Voh_SDI VDDIO=1.8V, ioh=1mA  
0.4  
100  
3.4  
V
V
I²C bus load capacitor Cb  
On SDI and SCK  
pF  
I²C timings :  
SCK frequency  
SCK low period  
SCK high period  
SDI setup time  
SDI hold time  
FI²C  
MHz  
ns  
Tlow  
160  
60  
Thigh  
Tsudat  
Thddat  
ns  
10  
ns  
10  
70  
ns  
Setup time  
for a repeated  
start condition  
Tsusta  
160  
ns  
Hold time for a  
start condition  
Thdsta  
Tsusto  
Tbuf  
160  
160  
100  
ns  
ns  
ns  
Setup time for a  
stop condition  
Time before a new  
transmission can start  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Start and stop conditions:  
Data transfer begins by a falling edge on SDA when SCK is high (start condition (S) indicated by  
I²C bus master). Stop condition (P) is a rising edge on SDA when SCK is high (see figure 12).  
Bit transfer:  
One data bit is transferred during each SCK pulse. Data on SDA line must remain stable during  
high period of SCK pulse (see figure 13).  
Acknowledge:  
After start condition each byte of data transfer is followed by an acknowledge bit. The  
transmitter let the SDA line high (no pull down) and generates a high SCK pulse. If BMA150 has  
been addressed and data transfer has performed correctly it generates a low SDA level (active  
pull down). Then SDA line is let free enabling the next transfer (see figure 14).  
Figure 12: Timing diagram for I²C start and stop condition (SDI=SDA)  
SDI  
SCK  
S
P
Start condition  
Stop condition  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Figure 13: Timing diagram for one bit transfer with I²C interface (SDI=SDA)  
SDI  
SCK  
Data line  
stable, data  
valid  
Change of  
data allowed  
Figure 14: Timing diagram for I²C acknowledgement on SDI (SDI=SDA)  
SDI  
By transmitter  
Not Acknowledge  
SDI  
By receiver  
Acknowledge  
SCK  
1
2
8
9
S
Start condition  
Clock pulse for  
acknowledgement  
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
4.2.1 I²C protocol:  
The BMA150 I²C slave address is coded on 7 bits (0111000b=38h) fixed by a metal option.  
Thus I²C write address is 01110000b (=70h), read address is 01110001b (=71h).  
After a start condition, the slave address + RW bit must be send. If the slave address does not  
match with BMA150 there is no acknowledgement and the following data transfer will not affect  
the chip. If the slave address corresponds to BMA150 it will acknowledge (pull SDA down during  
9th clock pulse) and data transfer is enabled. The 8th bit RW sets the chip in read or write  
mode, RW=1 for reading, RW=0 for writing.  
After slave address and RW bit, the master sends 1 control byte: the 7-bit register address and  
one dummy bit.  
When BMA150 is accessed in write mode, sequences of 2 bytes (= 1 control byte to define  
which address will be written and 1 data byte) must be sent:  
Figure 15: I²C multiple write protocol  
Control byte  
Data byte  
Slave Adress  
Register adress (09h)  
Register data - adress 09h  
Start  
S
RW ACK  
0
ACK  
ACK  
ACK  
0
1
1
1
0
0
0
X
X
0
0
0
0
0
1
0
0
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
Control byte  
Register adress (0Fh)  
Data byte  
Register data - adress 0Fh  
ACK Stop  
P
0
1
1
X
X
X
X
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
To be able to access registers in read mode, first address has to be send in write mode. Then a  
stop and a start conditions are issued and data bytes are transferred with automatic address  
increment:  
Figure 16: I²C multiple read protocol. Address register is first written to BMA150, the RW=0  
(lowest acceleration data located at address 02h). I²C transfer is stopped and restarted with  
RW=1, address is automatically incremented and the 6 bytes can be sequentially read out.  
Control byte  
Slave Adress  
Register adress (02h)  
Start  
S
Stop  
P
RW ACK  
0
ACK  
0
1
1
1
0
0
0
X
0
0
0
0
0
1
0
Data byte  
Register data - adress 02h  
Data byte  
Slave Adress  
Register data - adress 03h  
Start  
S
RW ACK  
1
ACK  
ACK  
ACK  
ACK  
ACK  
NACK  
0
1
1
1
0
0
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Data byte  
Register data - adress 04h  
Data byte  
Register data - adress 05h  
X
X
X
X
X
X
X
X
Data byte  
Register data - adress 06h  
Data byte  
Register data - adress 07h  
Stop  
P
X
X
X
X
X
X
X
X
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Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
5. Package  
5.1 Outline dimens ions  
The BMA150 is packaged in a 3mm x 3mm x 0.9mm LGA package following JEDEC MO-229.  
Basic outline geometry is based on:  
Mold package footprint  
Height  
No. of leads  
3mm x 3mm (tolerance ±0.1mm)  
0.9mm  
12  
- 8 used for electrical connection  
- 2 not used / reserved  
- 2 additional metal features on front edges without  
electrical functionality (not available on first engineering  
samples)  
Lead pitch  
0.5mm  
Please note: In addition to the LGA package, the BMA150 is also available in a QFN-type  
package, codenamed “SMB380”. The QFN and LGA packages are 100% pin compatible.  
Figure 17: Top, bottom and side views of the 3mm x 3mm x 0.9mm LGA package  
outline drawing (dimensions in mm)  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Notes related to figure 17:  
1) The vertical bar on the left-hand side of the marking on top of the package is just  
optional.  
2) For the halogen-free version of BMA150 (order code 0 273 141 043) the number on  
top of the package marking is “043” instead of “028”.  
5.2 Axes orientation  
The following diagram describes the orientation of the package with respect to the axes of  
acceleration measurement.  
Figure 18: Axes orientation of the BMA150  
+z  
5
+y  
1
+x  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
5.3 Landing pattern recommendations  
As for the design of the landing patterns, the following recommendations can be given:  
Note: this information is valid for QFN (SMB380) as well as for LGA packages (BMA150).  
Figure 19: Landing patterns for the BMA150 relative to the device pins, dimensions are in mm  
Figure 20: Perspective view of the BMA150 relative to the PCB landing pattern.  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
5.4 Mois ture s ens itivity level and s oldering  
The moisture sensitivity level (MSL) of the BMA150 sensor IC corresponds to JEDEC Level 1,  
see also  
-
IPC/JEDEC J-STD-020C  
"Joint Industry Standard: Moisture/Reflow Sensitivity  
Classification for Non-hermetic Solid State Surface Mount Devices"  
-
IPC/JEDEC J-STD-033A "Joint Industry Standard: Handling, Packing, Shipping and Use of  
Moisture/Reflow Sensitive Surface Mount Devices".  
The sensor IC fulfils the lead-free soldering requirements of the above-mentioned IPC/JEDEC  
standard, i.e. reflow soldering with a peak temperature up to 260°C.  
5.5 RoHS compliancy  
The BMA150 sensor IC meets the requirements of the EC restriction of hazardous substances  
(RoHS) directive, see also  
"Directive 2002/95/EC of the European Parliament and of the Council of 27 January 2003 on the  
restriction of the use of certain hazardous substances in electrical and electronic equipment".  
The BMA150 with the part number (order code) 0 273 141 043 is also halogen free.  
5.6 Note on internal package s tructures  
Within the scope of Bosch Sensortec’s ambition to improve its products and secure the product  
supply while in mass production, Bosch Sensortec qualifies additional sources for the LGA  
package of the BMA150.  
While Bosch Sensortec took care that all of the technical package parameters as described  
above are 100% identical for both sources, there can be differences in the chemical analysis  
and internal structural between the different package sources.  
However, as secured by the extensive product qualification processes of Bosch Sensortec, this  
has no impact to the usage or to the quality of the BMA150 product.  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
6. Pin-out out and connection diagrams  
Figure 21: Pin-out of the BMA150 (bottom view);  
Note: The pin-out schemes of the BMA150 and the SMB380 in QFN package are identical.  
Table 12: Pin-out description of the BMA150  
Pin  
No  
Connect to  
(in SPI 4w)  
Connect to  
(in SPI 3w)  
Connect to  
(in I²C)  
Stand alone  
(without µC)  
Name  
reserved  
VDD  
Type  
Description  
1
2
Do not connect  
NC  
VDD  
NC  
VDD  
NC  
VDD  
NC  
VDD  
Analogue power  
supply  
Power  
Power  
Output  
Input  
GND  
3
Ground  
Interrupt  
GND  
INT / NC  
CSB  
SCK  
SDO  
SDI  
GND  
INT / NC  
CSB  
SCK  
GND  
SDA  
VDDIO  
NC  
GND  
INT / NC  
VDDIO  
SCK  
GND  
SDA  
VDDIO  
NC  
GND  
INT  
INT  
4
CSB  
5
Chip select  
VDD  
SCK  
6
Input  
Serial clock  
GND  
GND  
GND  
VDD  
SDO  
7
Output  
Serial data out  
Serial data in / out  
Input /  
Output  
SDI  
8
Digital interface  
power supply  
VDDIO  
9
Power  
VDDIO  
NC  
reserved  
reserved  
reserved  
10  
11  
12  
Do not connect  
Do not connect  
Do not connect  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
Recommendation for decoupling: between GND and VDD (pin 1 or 2) a 22nF capacitor and between  
GND and IOVDD (pin 9) a 100nF capacitor should be connected.  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Figure 22: Connection diagram for use with 4-wire SPI interface  
BMA150  
Figure 23: Connection diagram for use with 3-wire SPI interface  
BMA150  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Figure 24: Connection diagram for use with I²C interface  
BMA150  
Figure 25: Connection diagram for stand alone use without microcontroller  
BMA150  
Rev. 1.5  
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BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
7. Operation modes  
7.1 Normal operational mode  
In normal operational mode the sensor IC can be addressed via digital interface. Data and  
status registers can be read out and control registers and EEPROM values can be read and  
changed. In parallel to normal operation the user has the option to activate several internal logic  
paths and set criteria to trigger the interrupt pin. BMA150 is designed to enable low current  
consumption of 200µA in operational mode.  
A self-test procedure can be started in operational mode for testing of the complete signal  
evaluation path including the micro-machined sensor IC structure, the evaluation ASIC and the  
physical connection to the host system.  
7.2 Sleep mode  
Sleep mode is activated by setting a control bit. In sleep mode no communication with the  
sensor IC is possible – all read and write commands are forbidden. The recommended  
command to switch to operational mode is the wake-up call.  
Wake-up time from sleep to operational mode is 1ms.  
In case of a soft-reset, it is recommended to do this reset after having switched from sleep to  
operational mode. In this case the total typical wake-up and reset time at maximum bandwidth is  
"switching to operational mode = 1ms" and "time after soft reset until acceleration data is  
available = 1.3ms", i.e. 2.3ms in total.  
In case a soft-reset is activated during sleep mode it can take up to 30ms until normal operation  
has resumed.  
The current consumption in sleep mode is 1µA.  
7.3 Wake-up mode  
In general BMA150 is attributed to low power applications and can contribute to the system  
power management.  
Current consumption 200µA operational  
Current consumption 1µA sleep mode  
Wake-up time 1ms  
Start-up time 3ms  
Data ready indicator to reduce unnecessary interface communication  
Wake-up mode to trigger  
when motion detected  
a
system wake-up (interrupt output to master)  
Low current consumption in wake-up mode  
The BMA150 provides the possibility to wake up a system master when specific acceleration  
values are detected. Therefore the BMA150 stays in an ultra low power mode and periodically  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
evaluates the acceleration data with respect to interrupt criteria defined by the user. An interrupt  
output can be generated and trigger the system master. The wake-up mode is used for ultra-low  
power applications where inertial factors can be an indicator to change the activity mode of the  
system.  
The following table shows values calculated for the average current consumption during the  
wake-up mode of the BMA150. The power consumption in wake-up mode is dependent on the  
duration of the interrupt algorithm (number of data acquisitions) and the bandwidth (for more  
details on setting of the bandwidth please refer to chapter 3.1.3).  
Table 13: Average current consumption in self wake-up mode using high-g or low-g interrupt  
Current cons umption during BMA150 wake-up mode [µA]  
(depending on bandwidth, calculated using typical values)  
(@ 1,500Hz)  
16.3  
5.1  
(@ 750Hz)  
21,8  
6.6  
(@375Hz)  
31.8  
9.7  
(@190Hz)  
48.4  
15.4  
4.4  
(@100Hz)  
71.6  
25.0  
6.9  
(@50Hz)  
102.9  
42.3  
(@25Hz)  
134.7  
68.4  
Paus e [ms ]  
20  
80  
360  
2,560  
1.9  
2.3  
3.0  
12.0  
21.3  
1.1  
1.2  
1.3  
1.5  
1.9  
2.6  
4.1  
Durations of the pause values can vary for about ±30% due to the accuracy of the ultra-low-  
power oscillator implemented within the sensor.  
For estimating the typical current consumption in wake-up mode the following formula can be  
applied:  
i_self_wake_up = (i_DD · t_active + i_DDsbm · wake-up-pause) / (t_active + wake-up-pause)  
With the approximation:  
t_active = 1ms + 0.333ms · (4 750 / bandwidth) + 0.333ms · (1500 / bandwidth) · n  
With the following parameters:  
i_DD  
Current in normal mode  
i_DDsm  
Current in sleep mode  
wake_up_pause  
n
Setting of wake-up pause  
number of data points in any-motion logic  
(n=0 for high-g threshold and low-g threshold interrupt,  
n=3 for any-motion logic)  
Bandwidth  
Setting of bandwidth (750-25 Hz),  
for 1500Hz t_active = 1ms + 0.333ms · (1500/bandwidth) · n  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
So, the relevant parameters for power consumption in self-wake up mode are:  
- the current consumption in normal mode  
- the current consumption in sleep mode  
- the self-wake up pause duration  
- the bandwidth (ie. length of digital filter to be filled for one data point)  
- the interrupt criteria (determines the duration of normal operation):  
high-g and low-g criteria (ie. acquisition of one data point)  
any-motion criterion (ie. four data points)  
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BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
As some of these parameters have certain deviations from the typical value results of various  
example Monte Carlo Simulations on the current consumption are shown in figures 26, 27 and  
28.  
The graphs provide an indication on the expected current consumption for different settings.  
Figure 26: Estimation of current consumption using Monte Carlo simulation,  
example #1: Bandwidth 750Hz, 2560ms wake-up setting, any-motion interrupt  
CurrentSelfWakeUp  
800  
700  
600  
500  
400  
300  
200  
100  
0
MW 1.41 µA  
3s 0.174 µA  
1.1  
1.2  
1.3  
1.4  
1.5  
1.6  
1.7  
1.8  
i_self_w ake_up [µA]  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Figure 27: Estimation of current consumption using Monte Carlo simulation,  
example #2: Bandwidth 47Hz, 2560ms wake-up setting, any-motion interrupt  
CurrentSelf WakeUp  
700  
600  
500  
MW 5.63 µA  
3s  
1.19 µA  
400  
300  
200  
100  
0
4.5  
5
5.5  
6
6.5  
7
7.5  
i_self_w ake_up [µA]  
Figure 28: Estimation of current consumption using Monte Carlo simulation,  
example #3: Bandwidth 23Hz, 2560ms wake-up setting, any-motion interrupt  
CurrentSelfWakeUp  
700  
600  
500  
MW 10.1 µA  
400  
300  
200  
100  
0
3s  
2.29 µA  
7
8
9
10  
11  
12  
13  
14  
i_self_w ake_up [µA]  
Rev. 1.5  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
8. Data convers ion  
8.1 Acceleration data  
Acceleration data are converted by a 10bit ADC. The description of the digital signal is "2’s  
complement". The 10 bit data are available as LSB (at lower register address) and MSB. It is  
possible to read out MSB only (8 bit) and LSB/MSB (16 bits with 10 data bits and 1 data ready  
bit) while LSB- and MSB-data are closely linked to avoid unintentional LSB/MSB mixing when  
read out and data conversion overlap accidentally (section 3.5.2).  
The update rate of data registers is 3 kHz, independent of the digital filter. The acceleration data  
is filtered by a second order analog filter at 1.5 kHz. Additionally the data can be processed by  
digital averaging filters (moving average) to reduce the noise level (750Hz – 25Hz).  
The transfer function of the mechanical element is designed to avoid resonance effects at  
frequencies below the bandwidth of the ASIC.  
The availability of new data can be checked in two ways:  
Bit 0 from the LSB data registers is an indicator whether the data have already been  
read out or the data are new (Bit0=1) (section 3.5.3).  
The interrupt pin can be configured to indicate new data availability (not possible in  
parallel to internal interrupt logic). The synchronization of data acquisition and data read  
out enables the customer to avoid unnecessary interface traffic in order to reduce the  
system power consumption and the crosstalk between interface communication and data  
conversion. For a detailed explanation see Figure 23. (section 3.2.10)  
Figure 29: Explanation of data ready interrupt: For a bandwidth of e.g. 1.5 kHz the data refresh  
cycle takes 330µs to update all data registers. After the final conversion of z-axis the INT pad  
will be set high. New data can be read out via interface (recommendation: read out within 20µs  
after interrupt is high during the conversion of the next temperature value). The interrupt resets  
automatically after read out.  
330µs at bw=1.5kHz  
T
X
Y
Z
T
X
Y
Z
INT  
8.2 Temperature meas urement  
Temperature data are converted to an 8bit data register. The temperature output range can be  
adapted to customer’s requirements by offset correction.  
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Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
9. Internal logic functions  
The sensor IC can inform the host system about specific conditions (e.g. new data ready flag or  
acceleration thresholds passed) by setting an interrupt pin high even if interface communication  
is not taking place. This feature can be used as “freefall indicator”, “wake-up” or “data ready  
flag” for instance.  
The interrupt performance can be programmed by means of control bits. Thus the criteria to  
identify a special event can be tailored to a customer’s application and the sensor IC output can  
be defined specifically.  
9.1 Freefall logic  
For freefall detection the absolute value of the acceleration data of all axes are investigated  
(global criteria). A freefall situation is likely to occur when all axes fall below a lower threshold  
value (“LG_thres”). The interrupt pin will be raised high if the threshold is passed for a minimum  
duration. The duration time can be programmed in units of ms (max. 255ms).  
The function “Freefall Interrupt” can be switched on/off by a control bit which is located within  
the image of the non-volatile memory. Thus this functionality can be stored as default setting of  
the sensor IC (EEPROM) but can also rapidly be changed within the image.  
The reset of the freefall interrupt can be accomplished by means of a master reset of the  
interrupt flag (latched interrupt) or the reset can be triggered by the acceleration signal itself  
(validation of a programmable “hysteresis”).  
See also section 3.2.7.  
9.2 High-g logic  
For indicating high-g events an upper threshold can be programmed. This logic can also be  
activated by a control bit. Threshold, duration and reset behaviour can be programmed. The  
high-g and freefall criteria can be logically combined with an <OR>.  
See also section 3.2.8.  
Rev. 1.5  
Page 51  
30 May 2008  
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such  
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
Figure 30: Explanation of freefall and high-g detection. Please see explanation within the text.  
|a|  
High-g threshold  
acceleration  
Hysteresis  
Freefall threshold  
Evaluation duration  
time  
INT  
high  
Latched INT  
Reset INT  
low  
9.3 Any motion detection  
The “any motion algorithm” can be used to detect changes of the acceleration. Thus it provides  
a relative evaluation of the acceleration signals. The criterion is kind of a gradient threshold of  
the acceleration over time. Thus one can distinguish between fast events with strong inertial  
dynamic (e.g. shock), instant changes of force balance (e.g. drop, tumbling) and even slight  
changes (e.g. touch of a mobile device).  
Due to a high bandwidth and a fast response MEMS device the BMA150 is capable to detect  
shock situations. The “any motion interrupt” or a high-g criterion setting can be used to give a  
shock alert. The phase shift between onset of mechanical shock and interrupt output is defined  
by the mechanical transfer function of the chassis and internal mounting interfaces (e.g. PDA  
shell) and the data output rate of the sensor IC (currently 330µsec, 100µsec under  
consideration).  
See also section 3.2.9.  
9.4 Alert Mode  
Using the BMA150 it is possible to combine the “any motion criterion” with low-g and high-g  
interrupt logic to improve the reaction time for e.g. free-fall identification.  
See also sections 3.2.9 and 3.4.2.  
Rev. 1.5  
Page 52  
30 May 2008  
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such  
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
10. Legal dis claimer  
10.1 Engineering s amples  
Engineering Samples are marked with an asterisk (*) or (e). Samples may vary from the valid  
technical specifications of the product series contained in this data sheet. They are therefore not  
intended or fit for resale to third parties or for use in end products. Their sole purpose is internal  
client testing. The testing of an engineering sample may in no way replace the testing of a  
product series. Bosch Sensortec assumes no liability for the use of engineering samples. The  
Purchaser shall indemnify Bosch Sensortec from all claims arising from the use of engineering  
samples.  
10.2 Product us e  
Bosch Sensortec products are developed for the consumer goods industry. They may only be  
used within the parameters of this product data sheet. They are not fit for use in life-sustaining  
or security sensitive systems. Security sensitive systems are those for which a malfunction is  
expected to lead to bodily harm or significant property damage. In addition, they are not fit for  
use in products which interact with motor vehicle systems.  
The resale and/or use of products are at the purchaser’s own risk and his own responsibility.  
The examination of fitness for the intended use is the sole responsibility of the Purchaser.  
The purchaser shall indemnify Bosch Sensortec from all third party claims arising from any  
product use not covered by the parameters of this product data sheet or not approved by Bosch  
Sensortec and reimburse Bosch Sensortec for all costs in connection with such claims.  
The purchaser must monitor the market for the purchased products, particularly with regard to  
product safety, and inform Bosch Sensortec without delay of all security relevant incidents.  
10.3 Application examples and hints  
With respect to any examples or hints given herein, any typical values stated herein and/or any  
information regarding the application of the device, Bosch Sensortec hereby disclaims any and  
all warranties and liabilities of any kind, including without limitation warranties of non-  
infringement of intellectual property rights or copyrights of any third party. The information given  
in this document shall in no event be regarded as a guarantee of conditions or characteristics.  
They are provided for illustrative purposes only and no evaluation regarding infringement of  
intellectual property rights or copyrights or regarding functionality, performance or error has  
been made.  
Rev. 1.5  
Page 53  
30 May 2008  
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such  
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
11. Document his tory and modification  
Please note that the document history refers to the SMB380 sensor device which is the previously  
developed QFN-packaged version of the BMA150.  
Rev. No Chapter  
Des cription of modification/changes  
Date  
1.0  
Document creation  
29-Dec-06  
1, 4.1.1,  
4.1.2, 4.2  
1.1  
Min. VDDIO = 1.62V  
14-May-07  
New package diagram, axes vs. package  
orientation  
Added “e” as marker for engineering samples  
5.1, 5.2, 5.3  
14-May-07  
14-May-07  
10  
3
Added warning about overwriting calibration data 14-May-07  
3.1.2  
1
4.2.1  
1
Corrected typo (correct address 14h)  
Added wake-up and start-up time  
Corrected slave address in figures 15 and 16  
Zero-g Offset updated to ±60mg  
BMA150 version  
14-May-07  
14-May-07  
14-May-07  
21-May-07  
17-July-07  
1.2  
1.3  
1
5.1, 5.3  
1
7.3  
LGA package (versus QFN package of SMB380) 17-July-07  
Inserted reference to ANA016 application note  
Added current consumption values during wake-  
up mode  
19-Oct-07  
19-Oct-07  
2
5.5  
3
Mechanical shock (10,000g duration)  
Halogen content of BMA150  
Extension of global memory map (figure 1)  
Table 12: Do not connect pin 1 and pin 10  
19-Oct-07  
19-Oct-07  
19-Oct-07  
19-Oct-07  
19-Oct-07  
19-Oct-07  
19-Oct-07  
19-Oct-07  
19-Oct-07  
14-Jan-08  
6
4.1.1, 4.1.2 Default SPI interface is 4-wire  
3
3.4.1  
5.6  
6
Added new note related to register 0Ah  
Use of self-test result bit  
Note on internal package structures  
Added description of pins 11 and 12  
Updated current consumption values and added  
timing data during wake-up mode  
1.4  
1.5  
7.3  
Title page  
Included second, halogen-free part number/order 30-May-08  
code 0 273 141 043  
5.1  
1
New package outline drawing with correct product 30-May-08  
code “028”  
Re-categorized sensitivity min./max. values as  
indications for reference (±4g/±8g range)  
Inserted max. indication for wake-up time  
Added comment on digital filter  
30-May-08  
1
1
3
30-May-08  
30-May-08  
30-May-08  
30-May-08  
30-May-08  
30-May-08  
30-May-08  
Minimum pause between EEPROM write cycles  
Added additional information and data  
Modified chapter on wake_up  
3.1.3  
3.1.4  
3.1.5  
3.2.10  
Added comment on accuracy of wake-up timer  
Added comments for “new_data_int”; re-worked  
Rev. 1.5  
Page 54  
30 May 2008  
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such  
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
Data sheet  
BMA150  
Bosch Sensortec  
Triaxial, digital acceleration sensor  
figure 3  
4.2  
7.2  
7.3  
Modified wording  
Modified chapter on sleep mode  
Re-worked complete chapter  
30-May-08  
30-May-08  
30-May-08  
Bosch Sensortec GmbH  
Gerhard-Kindler-Strasse 8  
72770 Reutlingen / Germany  
contact@bosch-sensortec.com  
www.bosch-sensortec.com  
Modifications reserved | Printed in Germany  
Specifications subject to change without notice  
Version_1.5_052008  
Rev. 1.5  
Page 55  
30 May 2008  
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such  
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.  
Note: Specifications within this document are subject to change without notice.  
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