AT42QTAN0040 Datasheet - ATMEL Corporation

AT42QTAN0040 Driving the AT42QT2160 QMatrix Sensor IC

Driving the AT42QT2160 QMatrix Sensor IC 1. Introduction This application note shows how the AT42QT2160-MMU (QT2160) 16-key QMatrix™ Sensor IC can be connected to a microprocessor to provide touch input functionality. Example code is provided to demonstrate how easily the QT2160 can be incorporated into a design. The code can be run “as is” or used as a starting point for QT2160based projects. The example compiles to under 1 Kbyte of code including all necessary I2C-compatible driver functions. .

AT42QTAN0040 Features

* a CHANGE pin, which can be used either to wake the host in a battery-powered application or as an interrupt signal to inform the host when the QT2160 status has changed. The CHANGE pin can be left unconnected in systems where the QT2160 is polled via the I2C-compatible bus on a regular basis. 2.3

AT42QTAN0040-ATMELCorporation.pdf