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):

ms

49

Response time

ms

24

Burst spacing interval

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

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.