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QT112-I

型号：

QT112-I

描述：

QT 11X系列的变化[ QT 11x Series Variations ]

品牌：

QUANTUM[ QUANTUM RESEARCH GROUP ]

页数：

6 页

PDF大小：

109 K

下载PDF手册
QT11x VARIATIONS  
QT111  
Longer recalibration timeouts  
Faster response time  
QT112  
QT115  
Variable gain, daisy-chaining  
4 August 2004  
Copyright QRG Ltd. (UK)  
Quantum Research Group Ltd.  
4 August 2004  
QT111-I / QT111H-I QProx™ 8-pin Sensor  
See QT110 datasheet for primary information. This sheet only lists differences with the QT110.  
This part is only available in -I suffix (-40..+85C)  
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  
Tie  
Max On-  
Pin 3 to:  
Pin 4 to:  
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.  
QT111H Version  
The QT111H version is the same as the QT111 except has an active-high output.  
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 - QT111-I  
DIP Package: DIP devices are marked 'QT111'  
SO8 Package: Marked 'QT1 Y'  
Package Marking - QT111H-I  
DIP Package: Not offered  
SO8 Package: Marked 'QT1 C'  
QT111 QProx™ 8-pin Sensor  
© 1999 QRG Ltd.  
Quantum Research Group Ltd.  
4 August 2004  
QT112-I / QT112H-I QProx™ 8-pin Sensor  
See QT110 datasheet for primary information. This sheet only lists differences with the QT110.  
This part is only available in -I suffix (-40..+85C)  
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):  
4.3 AC SPECIFICATIONS Vdd = 3.0, Ta = recommended operating range  
Description  
Min  
Typ  
Max  
Units  
Parameter  
Notes  
T
BS  
Burst spacing interval  
Response time  
24  
49  
ms  
ms  
T
R
4.4 SIGNAL PROCESSING  
Description  
Min  
Max  
Units  
Typ  
2
1,250  
24  
Notes  
Consensus filter length  
samples  
ms/level  
ms/level  
Positive drift compensation rate  
Negative drift compensation rate  
4.5 DC SPECIFICATIONS  
Vdd = 3.0V, Cs = 10nF, Cx = 5pF, Ta = recommended range, unless otherwise noted  
Parameter  
Notes  
Description  
Supply current  
Min  
Typ  
Max  
Units  
I
DD  
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.  
QT112H Version  
The QT112H version is the same as the QT112 except with an active-high output.  
All other operating modes, specifications, and wiring should be taken from the QT110 data sheet.  
Package Marking - QT112-I  
DIP Package: DIP devices are marked 'QT112'  
SO8 Package: Marked 'QT1 2I'  
Package Marking - QT112H-I  
DIP Package: DIP devices are marked 'QT112H'  
SO8 Package: Marked 'QT1 M'  
QT112 QProx™ 8-pin Sensor  
© 1999 QRG Ltd.  
Quantum Research Group Ltd.  
4 August 2004  
QT115-I / QT115H-I QProx™ 8-pin Sensor  
See QT110 datasheet for primary information. This sheet only lists differences with the QT110.  
This part is only available in -I suffix (-40..+85C)  
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  
30  
2
Typ  
40  
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  
ms  
ms  
ms  
ms  
T
BS2  
T
BL  
0.5  
8
75  
Cs = 10nf to 500nf, Cx = 0  
Note 1  
T
R
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  
counts  
%
Typ  
6
17  
Notes  
Threshold differential, fixed  
Hysteresis  
Note 1  
w.r.t. threshold cts.  
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  
QT113 QProx™ 8-pin Sensor  
© 1999 QRG Ltd.  
Quantum Research Group Ltd.  
4 August 2004  
5.5 DC SPECIFICATIONS VDD = 3.0V, CS = 10NF, CX = 10PF, TA = RECOMMENDED RANGE  
Parameter  
Notes  
Description  
Min  
Typ  
Max  
Units  
I
I
DD  
DD  
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  
1
2
3
4
Out  
Active-low output  
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  
QT113 QProx™ 8-pin Sensor  
© 1999 QRG Ltd.  
Quantum Research Group Ltd.  
4 August 2004  
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 QT115 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.  
QT115H Version  
The QT115H version is the same as the QT115 except with an active-high output.  
Package Marking - QT115  
DIP Package: DIP devices are marked 'QT115'  
SO8 Package: Marked 'QT1 H' or ‘QT115 I’  
Package Marking - QT115H  
DIP Package: DIP devices are marked 'QT115H'  
SO8 Package: Marked 'QT1 L'  
QT113 QProx™ 8-pin Sensor  
© 1999 QRG Ltd.  
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