Table of Contents
Description..................................................................................................................................................... 1
Features......................................................................................................................................................... 1
Product Support............................................................................................................................................. 1
1. Introduction............................................................................................................................................. 5
2. Capacitive Touch Measurement..............................................................................................................6
2.1. Self-Capacitance.......................................................................................................................... 6
2.2. Mutual Capacitance......................................................................................................................7
3. Touch Sensors...................................................................................................................................... 10
3.1. Buttons....................................................................................................................................... 10
3.2. Proximity Sensor........................................................................................................................ 10
3.3. Lumped Sensor.......................................................................................................................... 10
3.4. Interpolated Sensors.................................................................................................................. 11
3.5. 2D Position Sensors................................................................................................................... 11
3.6. Mix and Match............................................................................................................................ 11
4. PTC....................................................................................................................................................... 12
4.1. Overview.................................................................................................................................... 12
4.2. Self-Capacitance........................................................................................................................ 12
4.3. Mutual Capacitance....................................................................................................................12
5. QTouch
®
Modular Library......................................................................................................................14
5.1. Introduction.................................................................................................................................14
5.2. QTouch
®
Library Modules.......................................................................................................... 14
5.3. Module Naming Conventions..................................................................................................... 14
5.4. QTouch
®
Library Application Interface....................................................................................... 16
5.5. Application Flow......................................................................................................................... 17
5.6. MISRA Compliance.................................................................................................................... 17
6. Acquisition Module................................................................................................................................ 19
6.1. Overview.................................................................................................................................... 19
6.2. Interface..................................................................................................................................... 19
6.3. Functional Description................................................................................................................19
6.4. Configuration.............................................................................................................................. 20
7. Boost Mode........................................................................................................................................... 26
7.1. Introduction.................................................................................................................................26
7.2. Configuration.............................................................................................................................. 26
8. Frequency Hop Module.........................................................................................................................32
8.1. Overview.................................................................................................................................... 32
8.2. Interface..................................................................................................................................... 32
8.3. Functional Description................................................................................................................33
8.4. Configuration.............................................................................................................................. 33
User's Guide
© 2020 Microchip Technology Inc.
User Guide
DS40001986E-page 2
