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产品型号QT115-D的Datasheet PDF文件预览

QT11x VARIATIONS  
QT111  
Longer recalibration timeouts  
Faster response time  
Variable gain to 0.03pF  
See separate QT114 datasheet  
Variable gain, daisy-chaining  
QT112  
QT113  
QT114  
QT115  
3 April 2000  
Copyright QRG Ltd. (UK)  
3 August 1999  
QT111 QProx™ 8-pin Sensor  
See QT110 datasheet for primary information. This sheet only lists differences with the QT110.  
Description  
The QT111 is a touch sensor IC having recalibration timeouts (“max on-duration”) of 5 minutes and infinity.  
This allows the device to be used in situations where recalibration timeouts are not desired, for example in  
certain consumer, machine tool and process control applications where continuous touch over long periods is  
desired, like hand-on-joystick sensors, dead-man switches, etc. Although the primary application of the device  
is still as a ‘touch sensor’, longer timeouts also aknowledge alternate uses for the QT110 family, for example in  
process controls.  
Differences with QT110  
The QT111 sensor is exactly the same in all respects to the QT110 with the following exceptions shown in bold  
(refer to Table 2-1 in the QT110 datasheet):  
Table 2-1 Output Mode Strap Options  
Tie  
Pin 3 to:  
Tie  
Pin 4 to:  
Max On-  
Duration  
Vdd  
Vdd  
Gnd  
Gnd  
Vdd  
Gnd  
Gnd  
Vdd  
DC Out  
DC Out  
Toggle  
Pulse  
300s  
infinite  
300s  
300s  
All other operating modes, specifications, and wiring should be read from the QT110 data sheet.  
Cautionary Notes  
Care should be taken in infinite timeout mode that the Cs and Cx capacitances and the Vcc supply  
do not drift substantially over the course of a detection; if any of these parameters change  
sufficiently during the course of an active detection (remember: drift compensation is never  
performed during a detection event) the sensor can either ‘stick on’ after the detected object is  
removed, or, the QT110’s apparent sensitivity will be substantially reduced for a period of time until  
drift compensation can recover the proper reference level. If possible, uses the lowest gain setting  
when using with long timeouts.  
If the sensor ‘sticks on’ after the detected object or substance is removed from the sense element, the only way  
to clear the sensor may be to remove power momentarily in order to induce a full recalibration.  
Package Marking  
DIP Package: DIP devices are marked 'QT111'  
SO8 Package: Marked 'QT1' and also laserscribed '1'  
QT111 QProx™ 8-pin Sensor  
3 August 1999  
QT112 QProx™ 8-pin Sensor  
See QT110 datasheet for primary information. This sheet only lists differences with the QT110.  
Description  
The QT112 is a variant of the QT110 having a faster response time of 49ms worst case, and 25ms typical. It is  
designed for those touch sensing applications where faster speed is paramount, for example in games and toys  
where rapid reaction time is critical, or in machine tool controls where speed is important. It trades off power  
consumption for speed. Also, note that the device has a consensus filter count 2 instead of 4, and does not  
have an acoustic driver for a piezo 'beeper'.  
Differences with the QT110  
The QT112 sensor is exactly the same in all respects to the QT110 with the following exceptions (refer to  
Tables 4.3, 4.4, and 4.5 in the QT110 datasheet):  
Vdd = 3.0, Ta = recommended operating range  
4.3 AC SPECIFICATIONS  
Description  
Min  
Typ  
Max  
Units  
Parameter  
Notes  
TBS  
TR  
Burst spacing interval  
Response time  
24  
49  
ms  
ms  
4.4 SIGNAL PROCESSING  
Description  
Min  
Max  
Units  
Typ  
2
Notes  
Consensus filter length  
samples  
ms/level  
ms/level  
Positive drift compensation rate  
Negative drift compensation rate  
1,250  
24  
4.5 DC SPECIFICATIONS  
Vdd = 3.0V, Cs = 10nF, Cx = 5pF, Ta = recommended range, unless otherwise noted  
Parameter  
Notes  
Description  
Min  
Typ  
Max  
Units  
IDD  
Supply current  
60  
µA  
Piezo Driver Note: The piezo acoustic driver has been removed, as the duration required to operate the  
beeper would interfere with the sensing interval and slow down the device.  
All other operating modes, specifications, and wiring should be taken from the QT110 data sheet.  
Package Marking  
DIP Package: DIP devices are marked 'QT112'  
SO8 Package: Marked 'QT1' and also laserscribed '2'  
QT112 QProx™ 8-pin Sensor  
3 August 1999  
QT113 QProx™ 8-pin Sensor  
See QT110 datasheet for primary information. This sheet only lists differences with the QT110.  
Description  
The QT113 is a variant of the QT110 having variable sensitivity and faster response time in most cases. Unlike  
the QT110, it has a variable threshold which can be modified by simply altering the value of the sample  
capacitor Cs, which acts to modify gain. In addition, it also includes an 'infinite' max on-duration timeout, so that  
it is possible to prevent a recalibration during prolonged detections.  
The QT113 is designed for contact sensing applications where faster speed and high sensitivity are paramount,  
for example when sensing through thick panels or windows in machine tool applications or certain types of  
security monitoring. The QT113 trades off power consumption for speed and sensing range. Also, note that the  
device has a consensus filter count of 3 instead of 4, and does not have the drive capability for a piezo 'beeper'.  
Differences with the QT110  
The QT113 IC is exactly the same in all respects to the QT110 with the following exceptions (refer to Tables  
4.2, 4.3, 4.4, and 4.5 in the QT110 datasheet).  
4.2 RECOMMENDED OPERATING CONDITIONS  
Cx Load Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 100pF  
Cs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10nF to 500nF  
4.3 AC SPECIFICATIONS VDD = 3.0, TA = RECOMMENDED OPERATING RANGE  
Description  
Min  
Typ  
Max  
Units  
Parameter  
Notes  
Cs = 10nf to 500nf, Cx = 0  
Cs = 10nf to 500nf, Cx = 0  
Note 1  
TBS  
TBL  
TR  
Burst spacing interval  
Burst length  
2.1  
0.5  
8
80  
75  
ms  
ms  
ms  
Response time  
300  
Note 1: Lengthens with increasing Cs but decreases with increasing Cx; see Chart 3.  
4.4 SIGNAL PROCESSING  
Description  
Min  
Max  
Units  
Typ  
Notes  
Threshold differential, high gain  
Threshold differential, medium gain  
Threshold differential, low gain  
Threshold differential, fixed  
Hysteresis  
-
-
-
%
%
Note 1  
Note 1  
Note 1  
Note 1  
%
6
12  
counts  
%
17  
3
w.r.t. threshold cts.  
Consensus filter length  
samples  
ms/level  
ms/level  
Positive drift compensation rate  
Negative drift compensation rate  
1,000  
100  
Note 1: All percentage thresholds have been eliminated and replaced with fixed thresholds (high, low gains) w.r.t. the reference level  
4.5 DC SPECIFICATIONS VDD = 3.0V, CS = 10NF, CX = 10PF, TA = RECOMMENDED RANGE  
Parameter  
Notes  
Description  
Min  
Typ  
Max  
Units  
IDD  
S[1]  
S[2]  
S[3]  
S
Supply current  
700  
µA  
pF  
pF  
pF  
fF  
Cs = 10nF to 100nF  
Sensitivity - high gain  
Sensitivity - medium gain  
Sensitivity - low gain  
Sensitivity range  
-
-
-
-
Note 1  
Note 1  
Note 1  
1,000  
28  
Typical, see figs 1, 2; Note 1, 2  
Note 1: All percentage thresholds have been eliminated and replaced with a fixed threshold w.r.t. reference level  
Note 2: Sensitivity depends on value of Cx and Cs. Refer to Charts 1, 2.  
QT115 QProx™ 8-pin Sensor  
3 August 1999  
Piezo Driver Note  
The piezo acoustic driver has been removed, as the duration required to operate the beeper would interfere with  
the sensing interval and slow down the device.  
Sensitivity Adjustment  
The gain pin adjustment is via fixed thresholds slaved to the reference level. Likewise, gain strapping is  
different from the QT110: instead of connecting the Gain pin to SNS1 or SNS2, Gain must be connected to  
either Vdd (+) or Gnd as shown in Table 1-1 below. The E110 board does not directly support this and a wire  
should be run from the centerpost of the Gain jumper strip to either switched-Vdd or Gnd, as desired.  
Table 1-1 Gain Setting Strap Options  
Gain  
Tie Pin 5 to:  
Gnd  
Low (12 counts)  
High (6 counts)  
Vdd  
The sensitivity of the circuit is governed also by the relative sizes of Cs and Cx. A detection is made if the  
signal rises by 6 or 12 counts from the reference level depending on gain pin strapping; this amount, unlike the  
QT110, is not ratiometric to the signal level and therefore the sensitivity can be altered by simply changing Cs  
(and by changing gain strapping). To provide a consistent level of sensitivity, only stable types of capacitors are  
recommended for Cs, such as NPO, C0G, PPS film, and certain types of polycarbonate when used over normal  
room temperature ranges.  
Larger values of Cs will make the sensor more sensitive, while larger amounts of Cx will desensitize it (see  
Charts 1, 2). Minimizing stray Cx is crucial if high levels of sensitivity are desired. By using values of Cs around  
0.47uF (470nF), proximity distances of several centimeters can easily be obtained from small electrodes.  
NOTE: It is extremely important to maintain stable levels of Vdd, as the supply is used as a  
reference. Minor fluctuations in Vdd WILL cause false triggers or rapid swings in gain. DO NOT use  
bench power supplies or supply circuits shared with other digital functions. Ordinary 78L05 class  
regulators are fine in almost all cases. The QT113 is an extremely sensitive device. Do not take  
power supply issues lightly.  
Output Mode and Timing Changes  
The QT113 has different output mode strap options from the QT110 as shown:  
Table 2-1 Output Mode Strap Options  
Tie  
Pin 3 to:  
Tie  
Pin 4 to:  
Max On-  
Duration  
Vdd  
Vdd  
Gnd  
Gnd  
Vdd  
Gnd  
Gnd  
Vdd  
10s  
60s  
DC Out  
DC Out  
Toggle  
DC Out  
10s  
infinite  
The only change is that 'Pulse Mode' has been replaced by a DC Out mode having no recalibration timeout  
(max on-duration set to infinite).  
All other operating modes, specifications, and wiring should be taken from the QT110 data sheet.  
Calibration and Drift Compensation  
Calibration and drift compensation operate in the same manner as in the QT110. With large values of Cs and  
small values of Cx, drift compensation will appear to operate more slowly than with the converse. Note that the  
positive and negative drift compensation rates are different.  
QT115 QProx™ 8-pin Sensor  
3 August 1999  
Chart 1 - Typical Threshold Sensitivity vs. Cx,  
High Gain, at Selected Values of Cs; Vdd = 3.0  
Chart 2 - Typical Threshold Sensitivity vs. Cx,  
Low Gain, at Selected Values of Cs; Vdd = 3.0  
10.00  
1.00  
0.10  
0.01  
10.00  
1.00  
0.10  
0.01  
10nF  
20nF  
50nF  
100nF  
200nF  
500nF  
10nF  
20nF  
50nF  
100nF  
200nF  
500nF  
0
10  
20  
30  
40  
0
10  
20  
30  
40  
Cx Load  
Cx Load  
Response Time  
Chart 3 - Typical Response Time vs. Cx; Vdd = 3.0  
The QT113's response time is highly dependent  
on burst length, which in turn is dependent on Cs  
and Cx (see Charts 1, 2). With increasing Cs,  
response time slows, while increasing levels of  
Cs reduce response time. Chart 3 shows the  
typical effects of Cs and Cx on response time.  
1000.00  
100.00  
10.00  
1.00  
10nF  
HeartBeat™ Signal  
20nF  
50nF  
The QT113's HeartBeat pulse works exactly the  
same as in the QT110 except that the HeartBeat  
rate is the same as the burst rate, which can vary  
from 2ms to 100ms depending on Cs and Cx.  
Detection methods for this health indicator  
should take this into account. As with the QT110,  
the HB signal can be suppressed if not wanted  
by a variety of simple methods.  
100nF  
200nF  
500nF  
0
10  
20  
30  
40  
Package Marking  
Cx Load  
DIP Package: DIP devices are marked  
'QT113'  
SO8 Package: Marked 'QT1' and also laserscribed '3'  
QT115 QProx™ 8-pin Sensor  
3 April 2000  
QT115 QProx™ 8-pin Sensor  
See QT110 datasheet for primary information.  
Description  
The QT115 is a variant of the QT110 having variable sensitivity and the ability to daisy-chain, allowing multiple  
QT115's to be used in immediate proximity to each other to create a small touch panel of up to 10 keys. Like  
the QT113, it has a variable threshold which can be modified by simply altering the value of the sample  
capacitor Cs, which acts to modify gain. It does not include any of the option jumpers found on the QT110 or  
QT113; instead it has a single option jumper for 'Master' or 'Slave' mode operation.  
The QT115 includes 'Sync Out' and 'Sync In' pins for daisy-chaining. The first IC in the chain is the Master while  
the remaining devices in the chain are slaves. Daisy-chaining lets each device take its turn in generating a  
burst, free from interference by the other QT devices. In Master mode the IC operates autonomously, and  
generates a 20us negative Sync Out pulse on pin 3 after each burst. In Slave mode the IC issues a detection  
burst only after it receives a negative Sync pulse on pin 4 from a prior device in the chain, which could be  
another Slave or a Master. Slave devices in turn issue a 20us Sync pulse after each burst on pin 3.  
The QT115 is designed for contact and prox sensing applications where high sensitivity is paramount, for  
example when sensing through thick panels or windows or for security monitoring. The QT115 trades off power  
consumption for speed and sensing range. Also, note that the device has a consensus filter count of 3 instead  
of 4, and does not have the drive capability for a piezo 'beeper'.  
If desired, the Master device can be eliminated and the chain of Slave devices can be mastered from an  
external pulse source of 20us negative pulses at the desired repetition rate. This potentially allows for faster  
operation.  
Differences with the QT110  
The QT115 IC is exactly the same in all respects to the QT110 with the following exceptions (refer to Tables  
5.2, 5.3, 5.4, and 5.5 in the QT110 datasheet).  
5.2 RECOMMENDED OPERATING CONDITIONS  
Cx Load Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 100pF  
Cs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10nF to 500nF  
5.3 AC SPECIFICATIONS VDD = 3.0, TA = RECOMMENDED OPERATING RANGE  
Description  
Min  
Typ  
Max  
Units  
Parameter  
Notes  
Cs = 10nf to 500nf, Cx = 0  
Cs = 10nf, Cx = 0  
T
BS1  
Burst spacing interval, master  
Burst spacing interval, slave  
Burst length  
30  
2
40  
ms  
ms  
ms  
ms  
TBS2  
TBL  
TR  
0.5  
8
75  
Cs = 10nf to 500nf, Cx = 0  
Note 1  
Response time  
300  
Note 1: Lengthens with increasing Cs but decreases with increasing Cx; see Chart 3.  
5.4 SIGNAL PROCESSING  
Description  
Min  
Max  
Units  
Typ  
6
Notes  
Threshold differential, fixed  
Hysteresis  
counts  
%
Note 1  
w.r.t. threshold cts.  
17  
Consensus filter length  
3
samples  
ms/level  
ms/level  
secs  
Positive drift compensation rate  
Negative drift compensation rate  
Post-detection recalibration timer duration  
1,800  
40  
10  
Note 1: All percentage thresholds have been eliminated and replaced with a fixed threshold w.r.t. the reference level  
3 April 2000  
5.5 DC SPECIFICATIONS VDD = 3.0V, CS = 10NF, CX = 10PF, TA = RECOMMENDED RANGE  
Parameter  
Notes  
Description  
Min  
Typ  
Max  
Units  
IDD  
IDD  
S
Supply current, master mode  
Supply current, slave mode  
Sensitivity range  
60  
700  
-
µA  
µA  
fF  
Cs = 10nF to 100nF  
Cs = 10nF to 100nF  
Typical, see figs 1, 2; Note 1, 2  
1,000  
28  
Note 1: All percentage thresholds have been eliminated and replaced with a fixed threshold w.r.t. reference level  
Note 2: Sensitivity depends on value of Cx and Cs. Refer to Charts 1, 2.  
Piezo Driver Note  
The piezo acoustic driver has been removed, as the duration required to operate the beeper would interfere with  
the sensing interval and slow down the device.  
Sensitivity Adjustment Note  
The device has a fixed threshold point of 6 counts of deviation. Gain pin adjustment (pin 5) has been eliminated  
and replaced with a strap option for Master / Slave mode:  
Table 1-1 Master/Slave Strap Options  
Mode  
Master  
Slave  
Tie Pin 5 to:  
Vdd  
Gnd  
The sensitivity of the circuit is governed by the relative sizes of Cs and Cx. A detection is made if the signal  
rises by 6 counts from the reference level; this amount, unlike the QT110, is not ratiometric to the signal level  
and therefore the sensitivity can be altered by simply changing Cs. To provide a consistent level of sensitivity,  
only stable types of capacitors are recommended for Cs, such as NPO, C0G, PPS film, and certain types of  
polycarbonate when used over normal room temperature ranges.  
Larger values of Cs will make the sensor more sensitive, while larger amounts of Cx will desensitize it (see  
Charts 1, 2). Minimizing stray Cx is crucial if high levels of sensitivity are desired. By using values of Cs around  
0.47uF (470nF), proximity distances of several centimeters can easily be obtained from small electrodes.  
NOTE:  
It is extremely important to maintain stable levels of Vdd, as the supply is used as a  
reference. Minor fluctuations in Vdd WILL cause false triggers or rapid swings in gain. DO NOT use  
bench power supplies or supply circuits shared with other digital functions. Ordinary 78L05 class  
regulators are fine in almost all cases. The QT115 is an extremely sensitive device... do not take  
power supply issues lightly.  
Pin Functions  
The QT115 pins are defined as shown:  
Table 2-1 QT115 Pin Functions  
PIN  
Function  
Vdd  
Description  
Power, +3V to +5V  
Active-low output  
1
2
3
4
Out  
Sync Pulse Out (master or slave mode)  
Sync Pulse In (slave mode only)  
20us nominal negative sync pulse  
>10us, <50us negative pulse input to trigger in slave mode  
In Master Mode: Connect to either Gnd or Vcc.  
5
6
7
8
Master/Slave select  
Vdd = Master mode, Gnd = Slave mode (strap option)  
SNS1  
SNS2  
Gnd  
QT Sense pin 1  
QT Sense pin 2  
Ground, 0V  
3 April 2000  
Calibration and Drift Compensation  
Calibration and drift compensation operate similarly to the QT110. With large values of Cs and small values of  
Cx, drift compensation will appear to operate more slowly than with the reverse. Note that the positive and  
negative drift compensation rates are different; the sensor will compensate more quickly for the removal of an  
object than it will to the introduction of an object.  
The QT1115 uses a fixed recalibration timeout of 10 seconds.  
Response Time  
The QT115's response time is entirely dependent on the burst rate. In Master mode the nominal burst rate is  
40ms, and 3 successive bursts are required to confirm a detection, giving a nominal 120ms response time.  
In slave mode, the burst rate and hence response time are dependent on the input sync pulse rate. Faster sync  
pulse rates will lead to faster response times.  
HeartBeat™ Signal  
The QT115's HeartBeat pulse works exactly the same as in the QT110 except that the HeartBeat rate is the  
same as the burst rate. In Master mode, the HeartBeat signal occurs just before the acquisition burst. In slave  
mode, it occurs just after receipt of the slave pulse on pin 4. As with the QT110, the HB signal can be  
suppressed if not wanted by a variety of simple methods.  
Notes on Daisy Chaining QT115's  
The QT115 is intended to be daisy-chained for the purpose of allowing each of the sensors to operate without  
interference from other devices in the chain. This allows electrodes from each device to be placed immediately  
adjacent the other electrodes with only the barest of gaps.  
Individual devices in the chain can have unique sensitivities. QT113-style sensing allow for very high sensitivity  
levels if required. One device can be used with a large metal area to create a prox detector capable of many  
centimeters range, for example to activate the panel, equipment, or a light upon a mere hand-wave. The other  
devices in the chain can be used to implement low-gain touch switches that must be contacted by a fingertip for  
activation. The net effect of this configuration can be quite dramatic.  
The only limitation is that the sum of the burst lengths, which depends on load Cx and the Cs capacitor, must  
not be so long that burst of the last device in the chain overlaps the burst of the first device. Should this occur,  
the first and last devices may interfere with each other if the electrodes and wiring are adjacent to each other.  
One simple solution to this problem is to physically separate the traces and electrodes from devices that have  
overlapping bursts.  
Package Marking  
DIP Package: DIP devices are marked 'QT115'  
SO8 Package: Marked 'QT1' and also laserscribed '5'  
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