Data Sheet
FEATURES
Ultralow power (scales automatically with data rate)
As low as 30 µA in measurement mode (V
S
= 3.3 V)
As low as 0.1 µA in standby mode (V
S
= 3.3 V)
Low noise performance
150 μg/√Hz typical for X- and Y-axes
250 μg/√Hz typical for the Z-axis
Embedded, patent pending FIFO technology minimizes host
processor load
User-selectable resolution
Fixed 10-bit resolution for any
g
range
Fixed 1024 LSB/g sensitivity for any
g
range
Resolution scales from 10-bit at ±0.5
g
to 13-bit at ±4
g
Built-in motion detection functions for activity/inactivity
monitoring
Supply and I/O voltage range: 2.0 V to 3.6 V
SPI (3-wire and 4-wire) and I
2
C digital interfaces
Flexible interrupt modes mappable to two interrupt pins
Measurement range selectable via serial command
Bandwidth selectable via serial command
Wide temperature range (−40°C to +105°C)
10,000
g
shock survival
Pb free/RoHS compliant
Small and thin: 5 mm × 5 mm × 1.45 mm LFCSP package
Qualified for automotive applications
3-Axis, ±0.5
g/±1 g/±2 g/±4 g
Digital Accelerometer
GENERAL DESCRIPTION
The
is a small, thin, low power, 3-axis accelerometer
with high resolution (13-bit) measurement up to ±4
g.
Digital
output data is formatted as 16-bit twos complement and is
accessible through either a serial port interface (SPI) (3-wire or
4-wire) or I
2
C digital interface.
The
is well suited for car alarm or black box applications.
It measures the static acceleration of gravity in tilt-sensing applica-
tions, as well as dynamic acceleration resulting from motion or
shock. Its high resolution (1024 LSB/g) and low noise (150 μg/√Hz)
enable resolution of inclination changes of as little as 0.1°. A built-
in FIFO facilitates using oversampling techniques to improve
resolution to as little as 0.025° of inclination.
Several built-in sensing functions are provided. Activity and
inactivity sensing detects the presence or absence of motion and
whether the acceleration on any axis exceeds a user-set level.
These functions can be mapped to interrupt output pins. An
integrated 32-level FIFO can be used to store data to minimize
host processor intervention, resulting in reduced system power
consumption.
Low power modes enable intelligent motion-based power
management with threshold sensing and active acceleration
measurement at extremely low power dissipation.
The
is supplied in a small, thin 5 mm × 5 mm ×
1.45 mm, 32-lead LFCSP package and is pin compatible with
the
accelerometer device.
APPLICATIONS
Car alarms
Hill start aid (HSA) systems
Electronic parking brakes
Data recorders (black boxes)
FUNCTIONAL BLOCK DIAGRAM
V
S
V
DD I/O
ADXL313
POWER
MANAGEMENT
SENSE
ELECTRONICS
3-AXIS
SENSOR
ADC
DIGITAL
FILTER
CONTROL
AND
INTERRUPT
LOGIC
INT1
INT2
32-LEVEL
FIFO
SDA/SDI/SDIO
SERIAL I/O
SDO/ALT
ADDRESS
11469-001
SCL/SCLK
GND
CS
Figure 1.
Rev. 0
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