QTAN0079 Datasheet (Atmel) - Buttons / Sliders and Wheels Sensor Design Guide

QTAN0079, Buttons / Sliders and Wheels Sensor Design Guide

QTAN0079 Buttons, Sliders and Wheels Sensor Design Guide  10752A AT42 08/11 Table of Contents Getting Started v Section 1 Introduction To Sensor Design 1 1.1 1.2 1.3 1.4 Introduction 1 Touch Sensors1 Self-capacitance and Mutual-capacitance Sensors 2 Some Important Theory 3 Section 2 General Advice 5 2.1 QTouch Acquisition Methods 5 2.1.1 2.1.2 2.1.3 2.2 2.2.1 2.2.2 2.2.3 2.2.4 2.3 2.3.1 2.3.2 2.3.3 2.3.4 2.4 2.5 Introduction 5 Charge Transfer5 QTouch-ADC 7 Cs Capacitor 8