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QT112 Datasheet(PDF) 3 Page - Quantum Research Group |
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QT112 Datasheet(HTML) 3 Page - Quantum Research Group |
3 / 6 page 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 ms 49 Response time TR ms 24 Burst spacing interval TBS Notes Units Max Typ Min Description Parameter 4.4 SIGNAL PROCESSING ms/level 24 Negative drift compensation rate ms/level 1,250 Positive drift compensation rate samples 2 Consensus filter length Notes Units Max Typ Min Description 4.5 DC SPECIFICATIONS Vdd = 3.0V, Cs = 10nF, Cx = 5pF, Ta = recommended range, unless otherwise noted µA 60 Supply current IDD Notes Units Max Typ Min Description Parameter 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' Quantum Research Group Ltd. 4 August 2004 QT112 QProx™ 8-pin Sensor © 1999 QRG Ltd. |
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