Atmel QTouch Library User Guide

Device Specific LibrariesIntroductionThis section provides an overview of the usage of Device specific QTouch Libraries. DeviceSpecific Libraries have been provided for special devices, which are not covered as part ofGeneric Libraries.Devices supportedThe following devices are covered by the Device Specific QTouch Libraries.1. AT32UC3L family devices.2. ATtiny20 and ATtiny40 device.QTouch Library for AT32UC3L devicesATMEL QTouch Library for UC3L can be used for embedding capacitive touch buttons, slidersand wheels functionality into UC3L application. The QTouch Library for UC3L uses the CapacitiveTouch Module (CAT) that senses touch on external capacitive touch sensors.This Section describes the QTouch Library Application Programming Interface (API) for QMatrixand QTouch method acquisition using the AT32UC3L devices.Salient Features of QTouch Library for UC3LQMatrix method sensor• N Touch Channels formed by an X by Y matrix require (X+2Y+1) physical pins (whenusing internal discharge mode), N=X*Y. Please refer Figure 37 for pin requirements indifferent modes.• 1 to 136 Touch Channels can be configured.• Max X Lines = 17, Max Y Lines = 8.• Button is formed using 1 Touch Channel.• Slider is formed using 3 to 8 Touch Channels.• Wheel is formed using 3 to 8 Touch Channels.QTouch method sensor• 2 Physical pins per Touch Channel.• QTouch Sensors can be divided into two groups Group A and Group B.• Each QTouch group can be configured with different properties.• 1 to 17 Touch Channels can be configured.• Button is formed using 1 Touch Channel.• Slider is formed using 3 Touch Channels.• Wheel is formed using 3 Touch Channels.1148207K-AT42-09/11