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Atmel QTouch

SAM C20 Safety Library

USER GUIDE

Introduction

Atmel® QTouch® Peripheral Touch Controller (PTC) offers built-in hardware

for buttons, sliders, and wheels. 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 acquiring capacitive touch sensor signals. 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/Opins. 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.

The PTC supports two sets of libraries, the QTouch Library and the QTouch

Safety Library. The QTouch Library supports both mutual and self

capacitance methods. The QTouch Safety Library is available for both GCC

and IAR. The QTouch Safety Library also supports both the mutual

capacitance method and self capacitance method along with the additional

safety features.

Features

•Implements low-power, high-sensitivity, environmentally robust

capacitive touch buttons, sliders, and wheels

•Supports mutual capacitance and self capacitance sensing

•Upto 256 channels in mutual-capacitance mode

•Upto 32 channels in self-capacitance mode

•Two pin per electrode in mutual capacitance mode - with no external

components

•One pin per electrode in self capacitance mode - with no external

components

•Load compensating charge sensing

Atmel-42679C-SAM-C20-QTouch-Safety-Library_User Guide-07/2016

•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 desynchronization for high conducted immunity

•Supports moisture tolerance

•Atmel provided QTouch Safety Library firmware

•Supports Sensor Enable and Disable at Runtime

•Supports Quick Reburst Feature for Faster Response Time

•Low Power Sensor Support

The following features are available only in the QTouch Safety Library:

•CRC protection

•Logical program flow sequence

•Memory protection using double inverse mechanism

•Library RAM relocation and

•Compile-time and Run-time check

For more information about the capacitance related technological concepts, Refer Chapter 4 in Atmel

QTouch LibraryPeripheral Touch Controller User Guide [42195] available at www.atmel.com.

Product Support

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

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

request or access acomprehensive knowledge base. If you don’t have a myAtmel account, please visit

http://www.atmel.com/design-support/ to create a new account byclicking on “Create Account” in the

myAtmel menu at the top of the page. Once logged in, you will be able to access the knowledge base,

submit new support cases from the myAtmel page orreview status of your ongoing cases.

Atmel SAM C20 Safety Library [USER GUIDE]

Atmel-42679C-SAM-C20-QTouch-Safety-Library_User Guide-07/2016

Table of Contents

Introduction......................................................................................................................1

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

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

1.1. Device Variants Supported........................................................................................................... 5

2. QTouch Safety Library .............................................................................................. 6

2.1. API Overview................................................................................................................................6

2.2. Sequence of Operation................................................................................................................ 8

2.3. Program Flow .............................................................................................................................. 9

2.4. Configuration Parameters...........................................................................................................10

2.5. Touch Library Error Reporting Mechanism.................................................................................25

2.6. Touch Library Program Counter Test..........................................................................................25

2.7. CRC on Touch Input Configuration.............................................................................................27

2.8. Double Inverse Memory Check.................................................................................................. 30

2.9. Application Burst Again Mechanism...........................................................................................35

2.10. Memory Requirement.................................................................................................................35

2.11. API Execution Time.................................................................................................................... 37

2.12. Error Intepretation.......................................................................................................................41

2.13. Data and Function Protection.....................................................................................................44

2.14. Moisture Tolerance..................................................................................................................... 45

2.15. Quick Re-burst............................................................................................................................47

2.16. Reading Sensor States...............................................................................................................47

2.17. Touch Library Suspend Resume Operation............................................................................... 48

2.18. Drifting On Disabled Sensors..................................................................................................... 50

2.19. Capacitive Touch Low Power Sensor.........................................................................................51

3. QTouch Safety Library API...................................................................................... 57

3.1. Typedefs.....................................................................................................................................57

3.2. Macros........................................................................................................................................57

3.3. Enumerations............................................................................................................................. 58

3.4. Data Structures...........................................................................................................................66

3.5. Global Variables......................................................................................................................... 74

3.6. Functions....................................................................................................................................76

4. FMEA.......................................................................................................................86

4.1. Double Inverse Memory Check.................................................................................................. 86

4.2. Memory Requirement.................................................................................................................86

4.3. API Execution Time.................................................................................................................... 87

4.4. Error Interpretation..................................................................................................................... 89

4.5. Data and Function Protection.....................................................................................................89

4.6. FMEA Considerations.................................................................................................................90

5. FMEA API................................................................................................................91

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	ATSAMC20J16A

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