SAM D20 QTouch Robustness Demo [USER GUIDE]
Atmel-42324A-SAM-D20-QTouch-Robustness-Demo_UserGuide_102014
Table of Contents
1 Overview ..................................................................................................................... 3
2 Hardware Description ................................................................................................. 4
2.1 Block Diagram ....................................................................................................................................... 4
3 Pin Configuration ........................................................................................................ 5
3.1 Mutual Capacitance Sensors ................................................................................................................ 5
3.2 Self Capacitance Sensors ..................................................................................................................... 5
3.3 Indication ............................................................................................................................................... 6
3.4 Communication Interface ...................................................................................................................... 6
4 Unit Assembly ............................................................................................................. 7
5 Powering up the Kit ..................................................................................................... 8
5.1 USB Port ............................................................................................................................................... 8
5.2 External DC Power Supply .................................................................................................................... 8
6 Embedded Debugger (EDBG) ..................................................................................... 9
7 Connecting to QTouch Analyzer .............................................................................. 10
8 Switch Operation ....................................................................................................... 12
8.2 Noise Handling .................................................................................................................................... 12
8.3 Moisture Tolerance.............................................................................................................................. 12
9 Board Operation ........................................................................................................ 13
9.1 Product Layout .................................................................................................................................... 13
9.2 Button Description ............................................................................................................................... 13
9.2.1 Power Button .......................................................................................................................... 13
9.2.2 Lock Button ............................................................................................................................. 13
9.3 Operating Modes of the Kit .................................................................................................................. 14
9.3.1 Application Flow ..................................................................................................................... 14
9.3.2 Normal Mode .......................................................................................................................... 14
9.3.3 Mode Change ......................................................................................................................... 14
9.3.4 Settings Mode ......................................................................................................................... 15
9.3.4.1 LED Brightness Adjustment .................................................................................... 15
9.3.4.2 Buzzer Volume Adjustment .................................................................................... 15
10 Schematic .................................................................................................................. 17
10.1 MCU and Sensor Configuration Section.............................................................................................. 17
10.2 LED, Buzzer, and Switch Section ........................................................................................................ 18
10.3 Power Supply Section ......................................................................................................................... 19
10.4 Sensor Board ...................................................................................................................................... 19
11 PCB Design ................................................................................................................ 20
11.1 Main MCU PCB – Top Layer ............................................................................................................... 20
11.2 Main MCU PCB – Bottom Layer .......................................................................................................... 21
11.3 Sensor PCB – Top Layer .................................................................................................................... 22
11.4 Sensor PCB – Bottom Layer ............................................................................................................... 23
12 Bill of Materials .......................................................................................................... 24
13 References ................................................................................................................. 25
14 Revision History ........................................................................................................ 26