Atmel-42324-SAM-D20-QTouch-Robustness-Demo User-Guide AT08578

USER GUIDE
AT08578: SAM D20 QTouch Robustness Demo
Atmel QTouch
Description
®
®
The Atmel | SMART SAM D20 QTouch Robustness Demo demonstrates the
high performance capacitive touch support of the Peripheral Touch Controller
(PTC) while achieving best-in-class conducted immunity and moisture tolerance.
The demo implements a robustness solution that allows customers to easily
incorporate the Atmel QTouch technology into designs that require high levels of
noise immunity and moisture tolerance.
Features
 Six self-capacitance buttons with Philipp Spring
 Four mutual-capacitance buttons
 Individual LEDs for indicating button status
 One 8-channel mutual-capacitance slider
 Seven LEDs to indicate slider position
 Buzzer for audio feedback
 On-board Embedded Debugger module
 Connectivity with QTouch Analyzer
 On-board Embedded Debugger module for programming/debugging and
QDebug data streaming
Atmel-42324A-SAM-D20-QTouch-Robustness-Demo_UserGuide_102014
Ta bl e of Conte nts
1
Overview ..................................................................................................................... 3
2
Hardware Description ................................................................................................. 4
2.1
3
Block Diagram ....................................................................................................................................... 4
Pin Configuration ........................................................................................................ 5
3.1
3.2
3.3
3.4
Mutual Capacitance Sensors ................................................................................................................ 5
Self Capacitance Sensors ..................................................................................................................... 5
Indication ............................................................................................................................................... 6
Communication Interface ...................................................................................................................... 6
4
Unit Assembly ............................................................................................................. 7
5
Powering up the Kit ..................................................................................................... 8
5.1
5.2
USB Port ............................................................................................................................................... 8
External DC Power Supply .................................................................................................................... 8
6
Embedded Debugger (EDBG) ..................................................................................... 9
7
Connecting to QTouch Analyzer .............................................................................. 10
8
Switch Operation ....................................................................................................... 12
8.2
8.3
9
Noise Handling .................................................................................................................................... 12
Moisture Tolerance.............................................................................................................................. 12
Board Operation ........................................................................................................ 13
9.1
9.2
9.3
Product Layout .................................................................................................................................... 13
Button Description ............................................................................................................................... 13
9.2.1 Power Button .......................................................................................................................... 13
9.2.2 Lock Button............................................................................................................................. 13
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
10.2
10.3
10.4
MCU and Sensor Configuration Section.............................................................................................. 17
LED, Buzzer, and Switch Section ........................................................................................................ 18
Power Supply Section ......................................................................................................................... 19
Sensor Board ...................................................................................................................................... 19
11 PCB Design ................................................................................................................ 20
11.1
11.2
11.3
11.4
Main MCU PCB – Top Layer ............................................................................................................... 20
Main MCU PCB – Bottom Layer .......................................................................................................... 21
Sensor PCB – Top Layer .................................................................................................................... 22
Sensor PCB – Bottom Layer ............................................................................................................... 23
12 Bill of Materials .......................................................................................................... 24
13 References ................................................................................................................. 25
14 Revision History ........................................................................................................ 26
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Overview
This document describes the SAM D20 QTouch Robustness demo kit. The demo kit showcases both
self-capacitance (with springs) sensors and mutual-capacitance sensors running on the same Atmel SAM D20
microcontroller. The associated package for SAM D20 QTouch Robustness Demo contains the schematic,
Gerber, BoM, and firmware.
The demo kit consists of two different PCBs. The mutual capacitance sensors and LEDs are kept on the top PCB.
The self capacitance sensors and other electronics are kept on the bottom PCB. The PCBs are electrically
connected to each other by means of a flex cable. The PCBs are mechanically held by hex screw mount
standoffs. The front panel is pasted over the top sensor PCB.
The demo kit is designed to be used as a standalone unit with its own on-board microcontroller to evaluate the
noise immunity and moisture tolerance performance. The SAM D20 QTouch Robustness demo kit running its
associated firmware can pass Test Level 3 (10VRMS) of IEC/EN 61000-4-6 specifications for conducted immunity.
Figure 1-1.
Internal View of the Demo Kit
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2
Hardware Description
2.1
Block Diagram
Figure 2-1 shows the various modules of the SAM D20 QTouch Robustness Demo Kit.
Figure 2-1.
4
Block Diagram of SAM D20 QTouch Robustness Demo Kit
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D20 QTouch Robustness Demo [USER GUIDE]
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Pin Configuration
3.1
Mutual Capacitance Sensors
The demo kit has one slider and four buttons which are based on mutual-capacitance sensing technology. The
slider is composed of eight channels. There are eight X-lines and two Y-lines.
Table 3-1.
Pin Configuration of the Mutual Capacitance Sensors
FUNCTIONALITY
3.2
MCU PIN #
MCU PIN NAME
X0
17
PA08
X1
18
PA09
X2
19
PA10
X3
20
PA11
X12
25
PB12
X13
26
PB13
X14
27
PB14
X15
28
PB15
Y4
15
PA06
Y15
16
PA07
Self Capacitance Sensors
The demo kit has six buttons which are based on self capacitance sensing technology. Philipp Spring is used to
bridge the air gap between the PCB and front panel. The Philipp Spring design is patented by Atmel. The design
specification of the Philipp Spring can be obtained from Atmel.
Table 3-2.
Pin Configuration of the Self Capacitance Sensors
FUNCTIONALITY
MCU PIN #
MCU PIN NAME
Y1
4
PA03
Y10
5
PB04
Y11
6
PB05
Y12
9
PB06
Y13
10
PB07
Y14
11
PB08
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3.3
Indication
This demo kit has seventeen LEDs and a buzzer for audio visual indication of touch detection. Each button has
its corresponding LED that glows as long as the button is in detect. The slider has seven LEDs to indicate the
touch position on the slider.
The buzzer beeps when there is a valid touch detect.
Table 3-3.
Pin Configuration for LEDs and Buzzer
FUNCTIONALITY
3.4
MCU PIN #
MCU PIN NAME
LED BUTTON MC 0
36
PA17
LED BUTTON MC 1
35
PA16
LED BUTTON MC 2
38
PA19
LED BUTTON MC 3
37
PA18
LED SLIDER 0
45
PA24
LED SLIDER 1
44
PA23
LED SLIDER 2
43
PA22
LED SLIDER 3
42
PA21
LED SLIDER 4
41
PA20
LED SLIDER 5
40
PB17
LED SLIDER 6
39
PB16
LED BUTTON SC 0
2
PA01
LED BUTTON SC 1
1
PA00
LED BUTTON SC 2
64
PB03
LED BUTTON SC 3
63
PB02
LED BUTTON SC 4
62
PB01
LED BUTTON SC 5
61
PB00
BUZZER
60
PB31
Communication Interface
The communication pins of the Touch MCU are connected to the Data Gateway Interface (DGI) of the Embedded
Debugger (EDBG) module that acts as a bridge between PC and SAM D20 MCU. Touch data is sent using Bit
Bang SPI mode.
Table 3-4.
Pin Configuration for Bit Bang SPI Communication Interface
FUNCTIONALITY
6
MCU PIN #
MCU PIN NAME
BB-SS
31
PA14
BB-SCK
30
PA13
BB-MOSI
29
PA12
BB-MISO
32
PA15
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Unit Assembly
There are three separate units for the demo kit:

Acrylic Front Panel

Sensor PCB

Main MCU PCB
Figure 4-1.
Board Stack-up
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5
Powering up the Kit
There are multiple components in the kit which can handle different voltage ratings. The LEDs are driven at
+3.3V by default to ensure optimum brightness. The maximum safe operating voltage of the SAM D20 is +3.6V.
There is an on-board regulator in the kit to provide +3.3V supply to the SAM D20 MCU. There is provision in the
board to bypass the on-board regulator.
LED brightness can be increased by moving the PWR-LED jumper from 3.3V LED to 5V LED.
There are two ways to provide power to the kit. There is a set of jumpers in the Main MCU PCB to allow use of
different powering options.
5.1
USB Port
This is the default power option for the kit. The USB is connected to the EDBG module, which in turn connects to
the SAM D20 MCU. The +5V USB VBUS is fed to the on-board regulator of the Main MCU PCB which converts
it to +3.3V for the SAM D20 MCU.
Figure 5-1.
5.2
Default Jumper Configuration for USB as Power Supply
External DC Power Supply
There are two ways in which power can be provided to the kit externally:


8
[Configuration – I] The user can choose to use the on-board regulator and provide voltage from +5V to
+12V
[Configuration – II] The user can choose to bypass the regulator and provide +3.3V directly to the chip
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D20 QTouch Robustness Demo [USER GUIDE]
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Embedded Debugger (EDBG)
The demo kit features an on board Embedded Debugger (EDBG) module. This can be used for programming
and debugging the firmware using Atmel Studio. Additionally, it allows to stream touch data between the Host PC
and the kit using the Data Gateway Interface (DGI).
Figure 6-1.
EDBG Board on SAM D20 QTouch Robustness Demo Kit
The EDBG is mounted on the kit as a separate module. Using the EDBG the user can connect to QTouch
Analyzer and view the touch data. The EDBG has been pre-configured to support SAMD20J18 device using
SWD interface for programming and debugging.
For streaming data to QTouch Analyzer it uses DGI which connects to SAM D20 over Bit Bang SPI.
Figure 6-2.
Connecting with EDBG for Programming using Atmel Studio
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Connecting to QTouch Analyzer
The kit can be connected to the QTouch Analyzer to view touch data.
10
A.
Connect the kit to PC using a mini USB cable.
B.
Open QTouch Analyzer in Atmel Studio 6.
C.
Select QDEBUG_DGI from the drop down menu and click on Connect.
D.
Click OK when the DGI Settings screen pops up.
E.
Click Start Reading.
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F.
View touch signals in QTouch Analyzer.
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Switch Operation
There are two slide switches available on the board that can be used to enable or disable the countermeasures in
the firmware. These switches are present in the top left corner of the board.
Figure 8-1.
Switch Position in the Kit
Slide Up for OFF and Slide Down for ON
8.2
Noise Handling
The NOISE HANDLING switch is used to enable or disable the noise countermeasures in the firmware. The
position of the switch should be kept at ON when the demo kit is subjected to Conducted Immunity noise testing
or powered from a noisy power supply.
There is a beep sound whenever the switch is moved from ON to OFF or vice versa.
8.3
Moisture Tolerance
The MOISTURE TOLERANCE switch is provided to enable or disable the moisture tolerance countermeasures
in the firmware. The firmware is designed to detect the presence of moisture and lock the sensors so as to
prevent false detects.
There is a beep sound whenever the switch is moved from ON to OFF or vice versa.
Note:
12
Touch on multiple sensors simultaneously is not supported when this switch is in ON position.
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Board Operation
9.1
Product Layout
Figure 9-1 shows the product layout of the demo kit and the placement of both self capacitance and mutual
capacitance sensors.
Figure 9-1.
Layout of Sensors on the Kit
9.2
Button Description
9.2.1
Power Button
The power button is used to turn the panel ON or OFF.
The LED for power button will remain glowing to indicate the ON state of the touch panel. Touching the power
button again, the touch panel will be put to OFF state, and the LED will stop glowing.
There is a long beep when the button in OFF state comes into detect and the touch panel is activated. A short
beep is made when the button comes into detect in ON state and the touch panel is deactivated.
9.2.2
Lock Button
The Lock button is used to Enable or Disable all other touch sensors in the kit. While lock is enabled, the other
sensors will not respond to touch.
The LED for the Lock button will remain glowing to indicate the locked state of the touch panel. Touching the Lock
button in lock state will release the lock and the LED will turn OFF.
Every valid touch to the button is accompanied by a beep.
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9.3
Operating Modes of the Kit
9.3.1
Application Flow
Figure 9-2.
9.3.2
Top Level Application Flowchart of the SAM D20 QTouch Robustness Demo Firmware
Normal Mode
In this mode all sensors are operational. Detect state of button and slider position is provided by the
corresponding LEDs. For every valid touch there is a short beep.
This is the default mode of the touch panel.
9.3.3
Mode Change
To change the application mode, press and hold program buttons P3 and P4 for one second. This will change the
mode to Settings mode if the current mode is Normal mode and vice versa.
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Note:
If the kit is left in Settings mode for more than ten seconds, it will automatically switch to Normal mode.
There is a buzzer beep and LED activity for buttons P3 and P4 to indicate mode change. If Moisture
Tolerance is enabled, it will appear that both LEDs blink for a moment along with the buzzer beep. If
Moisture Tolerance is disabled, it will appear that both LEDs turn off after the buzzer beep.
9.3.4
Settings Mode
The Settings Mode allows adjustment of the audio visual impact of the kit. The kit provides feedback in form of
LED glow and buzzer beep for a valid touch. This mode can be used for the following:

Adjust the brightness of the LEDs for the mutual capacitance sensors

Adjust the volume of the buzzer
9.3.4.1 LED Brightness Adjustment
Following are the steps to adjust the brightness of the LEDs for mutual-capacitance sensors.
Ensure that you are in Settings Mode

Select the mutual capacitance button for which LED brightness is to be adjusted

Adjust the required brightness level using the slider

Save the LED brightness level by double tapping corresponding program button (P1 ~ P4)

Press and hold program buttons P1 and P2 for one second. This restores LEDs to default brightness
Note:
The LED brightness settings are saved temporarily in the RAM. A power cycle to the kit will restore the
LED brightness to default settings.
9.3.4.2 Buzzer Volume Adjustment
Following are the steps to adjust the volume of the buzzer.
Ensure that you are in Settings Mode

Press and hold program buttons P2 and P3 for one second. A beep will indicate that you have entered into
volume settings mode.

The number of LEDs glowing on the slider indicates the current volume setting. Adjust the volume level
using the slider. The buzzer sound is audible as long as the slider is touched.

Press and hold program buttons P2 and P3 for one second. This will save the buzzer volume level.
Note:
The buzzer volume is saved into the NVM. The volume setting is retained in the memory even after
power cycle. Buzzer volume is to be manually set; there is no provision for automatic reset of buzzer
volume.
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Figure 9-3.
16
Application Flow for the Settings Mode
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Schematic
10.1
MCU and Sensor Configuration Section
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10.2
LED, Buzzer, and Switch Section
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10.3
Power Supply Section
10.4
Sensor Board
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11
PCB Design
11.1
Main MCU PCB – Top Layer
1
2
4
6
8
10
1
3
5
7
9
1
3
1
50
2
49
3
48
4
47
5
46
6
45
7
44
8
43
2
2
1
1
9
42
10
41
11
40
12
39
13
38
14
37
15
36
16
35
17
34
18
33
19
32
20
31
3
1
2
3
1
2
3
1
1
2
1
1
2
2
1
1
2
1
2
2
2
1
1
2
1
2
2
3
2
1
2
1
1
2
1
1
3
2
2
1
1
2
3
1
2
1
2
1
4
2
3
1
2
3
3
1
2
1
2
1
0
1
0
1
2
1
2
2
3
1
2
2
21
22
23
24
25
26
27
28
29
30
3
1
2
1
2
1
2
1
2
3
1
1
1
1
1
2
2
2
2
1
1
1
1
1
2
2
2
2
2
2
1
2
2
3
1
6
1
3
7
2
5
4
3
1
2
1
2
1
2
2
1
2
1
2
1
2
1
2
1
2
1
2
1
1
2
1
2
3
1
2
1
1
2
2
3
2
1
1
2
1
10
9
8
7
6
5
4
3
2
1
2
1
1
2
2
2
1
3
1
2
1
1
2
1
2
1
2
1
2
1
2
1
1
1
1
2
3
2
1
2
1
2
3
1
2
2
1
1
1
2
1
2
1
2
2
3
1
1
1
1
1
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1
2
2
2
3
1
1
2
1
1
2
2
1
2
1
2
1
2
2
1
2
1
2
1
1
1
3
1
1
1
2
2
20
2
2
3
2
1
1
1
Main MCU PCB – Bottom Layer
11.2
1
1
3
1
2
1
1
1
3
1
1
50
2
49
3
48
4
47
5
46
6
45
7
44
8
43
9
42
10
41
11
40
12
39
13
38
14
37
15
36
16
35
17
34
18
33
19
32
20
31
1
1
2
21
22
23
24
25
26
27
28
29
30
1
1
1
6
7
1
1
1
2
1
2
1
2
1
10
9
8
7
6
5
4
3
2
1
1
1
2
1
1
1
2
1
1
1
1
2
2
2
2
1
2
1
1
1
1
1
1
1
1
1
1
1
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1
11.3
Sensor PCB – Top Layer
1
3
1
0
2
1
1
1
0
1
0
1
2
1
2
0
2
1
0
2
1
4
3
0
2
1
0
2
1
2
1
0
2
1
1
0
0
2
1
0
2
1
6
5
0
2
7
8
0
2
4
5
6
7
8
0
0
0
0
0
0
0
0
0
0
2
22
3
2
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11.4
Sensor PCB – Bottom Layer
1
3
1
1
2
1
25
1
0
2
2
2
1
1
0
26
1
2
1
1
2
0
2
2
1
1
0
1
2
2
1
2
1
0
1
2
2
1
2
1
0
1
0
1
2
2
2
1
1
0
1
2
2
2
1
1
2
2
1
2
1
0
1
0
1
2
2
1
2
1
0
2
2
1
2
2
2
1
1
2
0
2
0
0
0
0
0
0
0
0
0
0
0
2
2
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Bill of Materials
Table 12-1.
Top Level Bill of Materials
COMPONENT
Acrylic Front Panel
1
SAM D20 QTouch Robustness Demo Main MCU Board – PCBA
1
SAM D20 QTouch Robustness Demo Main Sensor Board – PCBA
1
Atmel EDBG – PCBA
1
Flex Cable
1
Hex Standoff - 5mm M3
4
Screw M3
4
Washer
4
(Rubber Feet) Bump-on
4
3M Adhesive Sheet (3M767/768)
1
Table 12-2.
Bill of Materials for the Sensor PCB
COMPONENT
VALUE
QUANTITY
DESIGNATOR
FCC Connector
Molex 52435-2471
1
Flex-Connector
SMD LED White
LTW-C230DS
(703-1174)
11
D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11
SMD Resistor 0603
330R
11
R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11
SMD Capacitor 0603
10nF
11
C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11
Broaching Sockets
KFE-M3-4ET
4
Table 12-3.
24
QUANTITY
Bill of Materials for the Main MCU PCB
COMPONENT
VALUE
QUANTITY
ROBUSTNESS DEMO
SPRING
AIREDALE(15020-B)
6
KEY 101, KEY 102, KEY 103, KEY 104, KEY 105,
KEY 106
Jumper
SNT-100-BK-G
3
JS1, JS2, JS3
FCC Connector
Molex 52435-2471
1
J301
Right Angle Header 1x3
STL1-1470ATT-003
3
J104, J105, J106
Right Angle Header 2x5
TSW-105-08-F-D-NA
1
J102
Voltage Regulator
LMS8117AMP-3.3/NOPB
1
U101
SMT Side Actuator
KMS223GPLFG
1
SW101
Slide Switch
EAO 09.10201.02
2
SW1, SW2
MCU
SAMD20J18A-AU
1
U301
Buzzer
ABT-402-RC
1
LS1
SMD Inductor
BLM18PG471SN1
1
L1
SAM
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DESIGNATOR
13
COMPONENT
VALUE
QUANTITY
DESIGNATOR
SMD BJT Transistor
BC847
18
Q18, Q201, Q202, Q203, Q204, Q205, Q206,
Q207, Q208, Q209, Q210, Q211, Q212, Q213,
Q214, Q215, Q216, Q218
SMD Capacitor 0603
100nF
7
C111, C302, C303, C304, C305, C306, C307
SMD Capacitor 0603
10nF
6
C201, C202, C203, C204, C205, C206
SMD Capacitor 0805
4.7µF
2
C101, C102
SMD Capacitor 0603
10µF
1
C301
SMD Resistor 0603
1k
12
R101, R102, R307, R308, R309, R310, R311,
R312, R313, R314, R315, R316
SMD Resistor 1206
1k
1
R219
SMD Resistor 0603
10k
18
R201, R202, R203, R204, R205, R206, R207,
R208, R209, R210, R211, R212, R213, R214,
R215, R216, R217, R220
SMD Resistor 0603
4.7k
1
R103
SMD Resistor 0603
220k
6
R301, R302, R303, R304, R305, R306
SMD Resistor 0603
330R
8
R104, R105, R221, R222, R223, R224, R225,
R226
5mm White LED_TH
C513A-WSS-CV0Y0151
6
D201, D202, D203, D204, D205, D206
Yellow SMD LED_0805
EL17-21UYC/A3
1
D101
References
The following documents can be used as reference for better understanding of the technology:
[1] Peripheral Touch Controller - User Guide.
[2] Atmel Embedded Debugger – User Guide.
[3] QTAN0079 – Buttons, Sliders, and Wheels Sensor Design Guide.
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Revision History
Doc Rev.
Date
42324A
10/2014
Comments
Initial document release.
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