SMART ARM-based Microcontrollers
SAM C20 QTouch Robustness Demo
USER GUIDE
Description
®
®
The Atmel | SMART SAM C20 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 robust solution that allows
customers to easily incorporate the Atmel QTouch technology into designs
that require a high level of noise immunity and moisture tolerance.
Features
•
Four self-capacitance buttons with Philipp Spring
•
One self-capacitance slider using six Philipp Spring
•
One seven segment LED to display slider position
•
Buzzer for audio feedback
•
On-board Embedded Debugger module for programming/debugging
and QDebug data streaming
•
Connectivity with the Atmel QTouch Analyzer
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
Table of Contents
Description.......................................................................................................................1
Features.......................................................................................................................... 1
1. Overview....................................................................................................................4
2. Hardware Description................................................................................................ 5
2.1.
Block Diagram ............................................................................................................................. 5
3. Pin Configuration....................................................................................................... 6
3.1.
3.2.
3.3.
Self Capacitance.......................................................................................................................... 6
Indication...................................................................................................................................... 6
Communication Interface..............................................................................................................7
4. Unit Assembly............................................................................................................8
5. Powering Up the Kit................................................................................................... 9
6. Embedded Debugger (EDBG)................................................................................. 10
7. Connecting to QTouch Analyzer.............................................................................. 12
8. Switch Operation..................................................................................................... 14
8.1.
8.2.
Noise Handling........................................................................................................................... 14
Moisture Tolerance..................................................................................................................... 14
9. Board Operation...................................................................................................... 15
9.1.
9.2.
9.3.
Product Layout........................................................................................................................... 15
Lock Button.................................................................................................................................15
Button Description...................................................................................................................... 15
9.3.1.
Minus Button................................................................................................................15
9.3.2.
9.3.3.
9.3.4.
Plus Button.................................................................................................................. 15
Power Button............................................................................................................... 16
Slider Sensors............................................................................................................. 16
10. Operating Modes of the Kit......................................................................................17
10.1.
10.2.
10.3.
10.4.
Application Flow......................................................................................................................... 17
Normal Mode..............................................................................................................................17
Mode Change.............................................................................................................................18
Settings Mode.............................................................................................................................18
10.4.1. Buzzer Volume Adjustment..........................................................................................18
11. Schematic................................................................................................................ 20
12. PCB Design............................................................................................................. 22
13. Bill of Materials........................................................................................................ 23
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
2
14. Reference................................................................................................................ 25
15. Revision History.......................................................................................................26
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
3
1.
Overview
This document describes the SAM C20 QTouch Robustness demo kit. The demo kit demonstrates self
capacitance button and slider implemented using Philipp springs. The associated package for SAM C20
QTouch Robustness Demo contains schematics, Gerber, BoM, and firmware.
The demo kit consists of a base board and a front panel. The front panel is mechanically fixed on the
base board by using plastic spacers.
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 C20 QTouch Robustness
demo kit running its associated firmware can pass Test Level 3 (10Vrms) of IEC/EN 61000-4-6
specification for conducted immunity.
Figure 1-1 Internal View of the Demo Kit
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
4
2.
Hardware Description
2.1.
Block Diagram
Figure 2-1 Block Diagram of SAM C20 QTouch Robustness Demo Kit
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
5
3.
3.1.
Pin Configuration
Self Capacitance
The demo kit has one slider and four touch buttons, which are based on self-capacitance technology.
There are ten Y-lines used. The slider is composed of six channels. Six individual buttons are arranged in
the format of slider. Philipp Spring is used to bridge the air gap between the PCB and front panel. The
Philipp Spring design is patented by Atmel and design specifications of the Philipp Springs can be
obtained from Atmel.
Table 3-1 Pin Configuration of the Self Capacitance Sensors
3.2.
FUNCTIONALITY
MCU PIN
MCU PIN NAME
Y1
4
PA03
Y14
7
PB08
Y15
8
PB09
Y2
9
PA04
Y3
10
PA05
Y5
12
PA07
Y16
13
PA08
Y17
14
PA09
Y8
47
PB02
Y9
48
PB03
Indication
This demo kit has one seven segment LED display, one buzzer for touch detection, and two LEDs to
indicate ON/OFF status of Power and Lock buttons.
Table 3-2 Pin Configuration of LEDs and Buzzer
FUNCTIONALITY
MCU PIN
MCU PIN NAME
LEDSEG1
25
PA16
LEDSEG2
26
PA17
LEDSEG3
27
PA18
LEDSEG4
28
PA19
LEDSEG5
29
PA20
LEDSEG6
30
PA21
LEDSEG7
31
PA22
LEDSEG8
32
PA23
LEDQT1
33
PA24
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
6
3.3.
FUNCTIONALITY
MCU PIN
MCU PIN NAME
LEDQT2
34
PA25
BUZZ-TC01
20
PB11
Communication Interface
The communication pins of the Touch MCU are connected to the Data Gateway Interface (DGI) of the
Embedded Debugger (EDBG) module through the level converter that acts as a bridge between PC and
SAM C20 MCU. Touch data is sent by using the Bit Bang SPI mode.
Table 3-3 Pin Configuration for Bit Bang SPI Commnunication Interface
FUNCTIONALITY
MCU PIN
MCU PIN NAME
DBG_MOSI
21
PA12
DBG_SCK
22
PA13
DBG_SS
23
PA14
DBG_MISO
24
PA15
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
7
4.
Unit Assembly
There are two separate units for the demo kit:
•
•
Acrylic Front Panel
Base PCB
Figure 4-1 Board Stack-up
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
8
5.
Powering Up the Kit
The demo kit can be powered either by using USB connected to the EDBG module or by using an
external +5V supply. There are multiple components in the kit which can handle different voltage ratings.
The SAM C20 is working in +5V for better noise immunity. The maximum safe operating rate of the SAM
C20 is +5.5V. The LEDs are driven at +3.3V by default to ensure optimum brightness. +3.3V for LEDs
and other components are supplied from the regulator on the EDBG module. LED also has an option for
+5V operation by using jumper selection.
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
9
6.
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 on SAM C20 QTouch Robustness Demo Kit
The EDBG is mounted on the kit as a separate module. Using the EDBG the user can connect to a
QTouch Analyzer and view the touch data. The EDBG has been pre-configured to support a SAMC20G18
device using SWD interface for programming and debugging. For streaming data to the QTouch Analyzer
it uses DGI, which connects to SAM C20 over Bit Bang SPI.
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
10
Figure 6-2 Connecting with EDBG for Programming using Atmel Studio
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
11
7.
Connecting to QTouch Analyzer
Follow the steps below to connect the QTouch Anayzer to view touch data.
1.
2.
3.
Connect the kit to PC using an mini USB cable.
Open QTouch Analyzer in Atmel Studio 6.
Select QDEBUG_DGI from the drop down menu and click on Connect.
Figure 7-1 Select QDEBUG_DGI
4.
Click OK when the DGI settings screen pops up.
Figure 7-2 DGI Settings Screen Pops Up
5.
Click Start Reading.
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
12
Figure 7-3 Capturing Touch Signal
6.
View the touch signal in the QTouch Analyzer.
Figure 7-4 Touch Signal View in QTouch Analyzer
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
13
8.
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 on the top side of the board.
Figure 8-1 Switch Position in the Kit
8.1.
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 noisy power supply.
There is a beep sound when the switch is moved from ON to OFF or vice versa.
8.2.
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 to prevent false detects.
There is a beep sound when the switch is moved from ON to OFF or vice versa.
Note: Touch on multiple sensors simultaneously is not supported when this switch is in ON position.
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
14
9.
Board Operation
9.1.
Product Layout
Figure 9-1 Layout of Sensors on the Kit
9.2.
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 lock the 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.
There is a long beep when the button detection put the panel in locked state and there will be a short
beep when the panel is released from the lock state.
9.3.
Button Description
9.3.1.
Minus Button
This minus button is used to decrement the slider position and the value will be displayed on the seven
segment LED display. A single tap on the button decrements the displayed position value by one count.
Continuous touch on the minus button will decrement the position value one by one until it reaches the
minimum value as “0”.
9.3.2.
Plus Button
This plus button is used to increment the slider position and the value will be displayed on the seven
segment LED display. A single tap on the button increments the displayed position value by one count.
Continuous touch on the plus button will increment the position value one by one until reach of the
maximum value as “b”.
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
15
9.3.3.
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. The seven
segment LED display shows zero when the power button is in ON state. 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 in to detect in ON state and the touch panel is deactivated.
9.3.4.
Slider Sensors
The slider is made of six individual self-capacitance button sensors and is interpreted as a low resolution
slider in the application. The number of positions reported is 11; from 0 to 9, and b. The reported position
in the application will be displayed on the seven segment LED display.
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
16
10.
Operating Modes of the Kit
10.1.
Application Flow
Figure 10-1 Top Level Application Flowchart of SAM C20 QTouch Robustness Demo Firmware
10.2.
Normal Mode
In this mode all sensors are operational. For every valid touch there is a short beep. If you touch the slider
the corresponding position will display on the seven segment LED display. The slider position can also be
changed by touching the plus or minus button.
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
17
10.3.
Mode Change
To change the application mode, press and hold both the plus and the minus buttons for one second. This
will change the mode to Settings mode if the current mode is Normal and vice versa.
Note: If the kit is left in Settings mode for more than ten seconds, it will automatically switch to Normal
mode.
10.4.
Settings Mode
10.4.1.
Buzzer Volume Adjustment
Following are the steps to adjust the volume of the buzzer. Ensure that you are in Settings mode.
•
•
•
Press and hold both the plus and the minus button for one second. A beep will indicate that you
have entered into Settings mode.
The LED segment display will indicate the corresponding digit of the current volume setting. Adjust
the volume level by using the slider. The buzzer sound is audible as long as the slider is touched.
Press and hold the plus and the minus button 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. The buzzer volume is to be manually set; there is no provision for automatic reset of
buzzer volume.
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
18
Figure 10-2 Application Flow for the Settings Mode
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
19
11.
Schematic
Figure 11-1 MCU and Sensor Configuration Section
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
20
Figure 11-2 LED Segment, Buzzer, and Switch Section
Figure 11-3 EDBG Headers and Connectors
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
21
12.
PCB Design
Figure 12-1 Top Layer
Figure 12-2 Bottom Layer
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
22
13.
Bill of Materials
Table 13-1 Top Level Bill of Materials
COMPONENT
QUANTITY
Acrylic Front Panel
1
SAM C20 QTouch Robustness Demo Base Board - PCBA
1
Atmel EDBG-PCBA
1
(Rubber Feet) Bump-on
4
Plastic Spacers 11.8mm
6
Nylon Screw 4.3mm
6
Table 13-2 Bill of Material for the Base Board
Designator
Quantity Value
Description
C107, C109, C112, C113
4
1μF
SMD Capacitor 0603
C108, C110
2
4.7μF
SMD Capacitor 0603
C111, C121, C302, C303,
C304, C305, C307
7
100nF
SMD Capacitor 0603
C114, C116, C117, C119
4
100nF
SMD Capacitor 0402
C115, C118
2
1μF
SMD Capacitor 0402
C120, C301
2
10μF
SMD Capacitor 0603
C201, C202, C203, C204,
C205, C206, C207, C208,
C209, C210
10
10nF
SMD Capacitor 0603
D101
1
EL17-21UYC/A3
Yellow LED SMD 0805
D205, D206
2
C513A-WSS-CV0Y0151
5mm White LED_TH
E1, E2, E3, E4
4
SJ-5303
Adhesive feet, diam. 11.1mm
J101
1
EDBG module
Atmel Generic EDBG module
J102
1
RT Pin Header 2X5
Right Angle Header 2x5
J103
1
RT Pin Header 2X5
Right Angle Header 2x5
J105
1
RT Pin Header 1X3
Right Angle Header 1x3
J300
1
Pin header 1x2 right angle
Right Angle Header 1x2
JS2, JS301
2
SNT-100-BK-G
Jumper cap for 2.54mm
pinheader
KEY101, KEY102, KEY103,
KEY104, KEY105, KEY106,
KEY107, KEY109, KEY110,
KEY114
10
Philipp Spring
Spring for touch applications
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
23
Designator
Quantity Value
Description
L1, L101
2
BLM18PG471SN1
SMD RF inductor 0603
LED201
1
HDSP-H151
LED 7-SEG, Red, Common
Anode
LS1
1
ABT-402-RC
Buzzer
PCB1
1
SAMC20 QTR Demo Base
Board PCB Documentation
SAMC20 QTR Demo Base
Board PCB Documentation
Q18, Q211, Q212
3
BC847W
NPN SMD BJT transistor
Q200, Q201, Q202, Q203
4
2N7002DW
Dual N-Channel MOSFET
R101, R102, R219, R301,
R302, R303, R304, R305,
R306, R307, R309, R310,
R314
13
1kΩ
SMD Resistor 0603
R103
1
4.7kΩ
SMD Resistor 0603
R104, R105, R221, R222
4
330Ω
SMD Resistor 0603
R106, R108, R225, R226,
R227, R228, R229, R230,
R231, R232
10
0Ω
SMD Resistor 0402
R107, R109
2
100kΩ
SMD Resistor 0402
R200, R201, R202, R203,
R204, R205, R206, R207
8
1MΩ
SMD Resistor 0402
R208, R209, R214, R215,
R216, R217, R223, R224
8
330Ω
SMD Resistor 0402
R210, R211, R218
3
510Ω
SMD Resistor 0402
R212, R213, R220
3
10kΩ
SMD Resistor 0603
SW1, SW2
2
SPDT
Slide Switch
SW101
1
KMS223GPLFG
SMT Side Actuator
U101, U102
2
TXS0104ERGYR
Voltage Level Translator
U300
1
SAMC20G18A-AN
MCU
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
24
14.
Reference
[1]. QTAN0079: Buttons, Sliders and Wheels, Touch Sensor Design Guide - http://www.atmel.com/
Images/doc10752.pdf
[2]. SAM D Peripheral Touch Controller User Guide - http://www.atmel.com/Images/Atmel-42195-QTouchGeneral-Library-Peripheral-Touch-Controller_User-Guide.pdf
[3]. AT09363: PTC Robustness Design Guide, application note - http://www.atmel.com/images/
atmel-42360-ptc-robustness-design-guide_applicationnote_at09363.pdf
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
25
15.
Revision History
Doc Rev.
Date
Comments
42525A
09/2015
Initial document release.
Atmel SAM C20 QTouch Robustness Demo [USER GUIDE]
Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
26
Atmel Corporation
©
1600 Technology Drive, San Jose, CA 95110 USA
T: (+1)(408) 441.0311
F: (+1)(408) 436.4200
|
www.atmel.com
2015 Atmel Corporation. / Rev.: Atmel-42525A-SAM-C20-QTouch-Robustness-Demo_User Guide-09/2015
®
®
®
Atmel , Atmel logo and combinations thereof, Enabling Unlimited Possibilities , QTouch and others are registered trademarks or trademarks of Atmel Corporation in
®
®
U.S. and other countries. ARM , ARM Connected logo, and others are the registered trademarks or trademarks of ARM Ltd. Other terms and product names may
be trademarks of others.
DISCLAIMER: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any
intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN THE ATMEL TERMS AND
CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED
OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS AND PROFITS, BUSINESS
INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED
OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this
document and reserves the right to make changes to specifications and products descriptions at any time without notice. Atmel does not make any commitment to
update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive
applications. Atmel products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.
SAFETY-CRITICAL, MILITARY, AND AUTOMOTIVE APPLICATIONS DISCLAIMER: Atmel products are not designed for and will not be used in connection with any
applications where the failure of such products would reasonably be expected to result in significant personal injury or death (“Safety-Critical Applications”) without
an Atmel officer's specific written consent. Safety-Critical Applications include, without limitation, life support devices and systems, equipment or systems for the
operation of nuclear facilities and weapons systems. Atmel products are not designed nor intended for use in military or aerospace applications or environments
unless specifically designated by Atmel as military-grade. Atmel products are not designed nor intended for use in automotive applications unless specifically
designated by Atmel as automotive-grade.
工商网监
湘ICP备2023018690号
