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Details, datasheet, quote on part number:QT111-IS
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Datasheet text preview:
QT11x VARIATIONS
QT111 QT112 QT113 QT114 QT115 Longer recalibration timeouts Faster response time Variable gain to 0.03pF See separate QT114 datasheet Variable gain, daisy-chaining
3 April 2000
Copyright QRG Ltd. (UK)
QT111 QProxTM 8-pin Sensor
3 August 1999
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: DC Out DC Out Toggle Pulse Vdd Vdd Gnd Gnd Tie Pin 4 to: Vdd Gnd Gnd Vdd Max OnDuration 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 QProxTM 8-pin Sensor
QT112 QProxTM 8-pin Sensor
3 August 1999
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):
4.3 AC SPECIFICATIONS
Parameter
TBS TR
Vdd = 3.0, Ta = recommended operating range
Min Typ
24 49
Description
Burst spacing interval Response time
Max
Units
ms ms
Notes
4.4 SIGNAL PROCESSING
Description
Consensus filter length Positive drift compensation rate Negative drift compensation rate
Min
Typ
2 1,250 24
Max
Units
samples ms/level ms/level
Notes
4.5 DC SPECIFICATIONS
Vdd = 3.0V, Cs = 10nF, Cx = 5pF, Ta = recommended range, unless otherwise noted
Parameter IDD
Description
Supply current
Min
Typ
60
Max
Units
ľA
Notes
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 QProxTM 8-pin Sensor
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