Microchip ATSAMC21N18A Manual

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User's Guide

QTouch® Modular Library Peripheral Touch Controller

User's Guide

Description

The Microchip QTouch® Peripheral Touch Controller (PTC) offers built-in hardware for capacitive touch measurement

on sensors that function as buttons, sliders, and wheels. The PTC supports both mutual and self-capacitance

measurements without the need for any external component. It offers superb sensitivity and noise tolerance, as well

as self-calibration, and minimizes the sensitivity tuning effort by the user. It also extends the support for capacitive

touch surface and gesture functionality.

The PTC is intended for autonomously performing capacitive touch sensor measurements. The external capacitive

touch sensor is typically formed on a PCB, and the sensor electrodes are connected to the analog charge integrator

of the PTC using the device I/O pins. The PTC supports mutual capacitance sensors organized as capacitive touch

matrices in different X-Y configurations, including Indium Tin Oxide (ITO) sensor grids. In Mutual Capacitance mode,

the PTC requires one pin per X-line (driveline) and one pin per Y-line (sense line). In Self-Capacitance mode, the

PTC requires only one pin with a Y-line driver for each self-capacitance sensor.

Features

• Implements Low-Power, High-Sensitivity, Environmentally Robust Capacitive Touch Buttons

• Supports Mutual Capacitance and Self-Capacitance Sensing

• Up to 46 Buttons in Self-Capacitance mode

• Up to 529 Buttons in Mutual Capacitance mode

• Supports Lumped Mode Configuration

• One Pin Per Electrode

• Load Compensating Charge Sensing

• Parasitic Capacitance Compensation for Mutual Capacitance mode

• Adjustable Gain for Superior Sensitivity

• Zero Drift Over the Temperature and VDD Range

• No Need for Temperature or VDD Compensation

• Hardware Noise Filtering and Noise Signal De-Synchronization for High Conducted Immunity

• Atmel Start QTouch Configurator Support – Wizard Guided Touch Project Creation

Product Support

For assistance related to QTouch capacitive touch sensing software libraries and related issues, contact your local

Microchip sales representative or visit https://www.microchip.com/support/.

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