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Atmel QTouch Library

QTouch Library Peripheral Touch Controller

USER GUIDE

Description

Atmel® 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

measurement 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.

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 (drive line) 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, sliders, and wheels

•Supports mutual capacitance and self-capacitance sensing

•Up to 32 buttons in self-capacitance mode

•Up to 256 buttons in mutual capacitance mode

•Supports lumped mode configuration

•One pin per electrode - no external components

•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 provided QTouch Library firmware and QTouch Composer tool

Atmel-42195M-Peripheral-Touch-Controller_User Guide-07/2016

Product Support

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

your local Atmel sales representative or log on to myAtmel Design Support portal to submit a support

request or access a comprehensive knowledge base.

If you do not have a myAtmel account, please visit http://www.atmel.com/design-support/ to create a new

account by clicking on in the myAtmel menu at the top of the page.Create Account

When logged in, you will be able to access the knowledge base, submit new support cases from the

myAtmel page or review status of your ongoing cases.

Atmel QTouch Library Peripheral Touch Controller [USER GUIDE]

Atmel-42195M-Peripheral-Touch-Controller_User Guide-07/2016

Table of Contents

Description.......................................................................................................................1

Features.......................................................................................................................... 1

1. Development Tools ................................................................................................... 5

2. Device Variants Supported........................................................................................ 6

3. Capacitive Touch Technology.................................................................................... 8

3.1. Capacitive Touch Sensors............................................................................................................8

3.2. Capacitance Measurement Methods............................................................................................8

3.3. Self-capacitance Measurement Method.......................................................................................8

3.4. Mutual Capacitance Measurement Method..................................................................................9

3.5. Capacitive Touch Lumped Sensors..............................................................................................9

3.6. Capacitive Touch Low Power Sensor......................................................................................... 11

3.7. PTC and its Benefits...................................................................................................................13

3.8. PTC Block Diagram for Self-capacitance and Mutual Capacitance Method.............................. 13

3.9. Design Approach with PTC........................................................................................................ 15

3.10. Capacitive Touch Development Cycle........................................................................................16

4. Touch Sensor Debug and Status Information.......................................................... 17

4.1. Signal..........................................................................................................................................17

4.2. Reference...................................................................................................................................17

4.3. Delta........................................................................................................................................... 18

4.4. Touch Status & Slider/Wheel Position........................................................................................ 19

5. QTouch Library........................................................................................................ 20

5.1. Overview.....................................................................................................................................20

5.2. Library Parameters.....................................................................................................................21

5.3. Moisture Tolerance..................................................................................................................... 42

5.4. Reading Sensor States...............................................................................................................44

5.5. Application Flow......................................................................................................................... 44

5.6. API Sequence.............................................................................................................................46

5.7. State Machine.............................................................................................................................47

5.8. Operation Modes........................................................................................................................50

5.9. Touch Library API Error.............................................................................................................. 52

6. Tuning for Noise Performance.................................................................................54

6.1. Noise Sources............................................................................................................................ 54

6.2. Noise Counter Measures............................................................................................................54

7. Application Design................................................................................................... 60

7.1. Touch Library and Associated Files............................................................................................60

7.2. Code and Data Memory Considerations.................................................................................... 60

8. Example Applications.............................................................................................. 63

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	ATSAMDA1E16B

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