ATSAMC20-QTRDEMO [MICROCHIP]
EVAL KIT FOR SAMC20 QTOUCH;
| 型号： | ATSAMC20-QTRDEMO |
| 厂家： | 
MICROCHIP |
| 描述： | EVAL KIT FOR SAMC20 QTOUCH |
| 文件： | 总27页 (文件大小：17228K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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. Self Capacitance.......................................................................................................................... 6
3.2. Indication......................................................................................................................................6
3.3. 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. Noise Handling...........................................................................................................................14
8.2. Moisture Tolerance.....................................................................................................................14
9. Board Operation...................................................................................................... 15
9.1. Product Layout........................................................................................................................... 15
9.2. Lock Button.................................................................................................................................15
9.3. Button Description......................................................................................................................15
9.3.1.
9.3.2.
9.3.3.
9.3.4.
Minus Button................................................................................................................15
Plus Button.................................................................................................................. 15
Power Button............................................................................................................... 16
Slider Sensors............................................................................................................. 16
10. Operating Modes of the Kit......................................................................................17
10.1. Application Flow......................................................................................................................... 17
10.2. Normal Mode..............................................................................................................................17
10.3. Mode Change.............................................................................................................................18
10.4. Settings Mode.............................................................................................................................18
10.4.1. Buzzer Volume Adjustment..........................................................................................18
11. Schematic................................................................................................................20
12. PCB Design.............................................................................................................22
13. Bill of Materials........................................................................................................ 23
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14. Reference................................................................................................................25
15. Revision History.......................................................................................................26
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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 1-1ꢀ Internal View of the Demo Kit
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2.
Hardware Description
2.1.
Block Diagram
Figure 2-1ꢀ Block Diagram of SAM C20 QTouch Robustness Demo Kit
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3.
Pin Configuration
3.1.
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 3-1ꢀPin Configuration of the Self Capacitance Sensors
FUNCTIONALITY
MCU PIN
MCU PIN NAME
PA03
Y1
4
Y14
Y15
Y2
7
PB08
8
PB09
9
PA04
Y3
10
12
13
14
47
48
PA05
Y5
PA07
Y16
Y17
Y8
PA08
PA09
PB02
Y9
PB03
3.2.
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 3-2ꢀPin Configuration of LEDs and Buzzer
FUNCTIONALITY
LEDSEG1
LEDSEG2
LEDSEG3
LEDSEG4
LEDSEG5
LEDSEG6
LEDSEG7
LEDSEG8
LEDQT1
MCU PIN
MCU PIN NAME
PA16
25
26
27
28
29
30
31
32
33
PA17
PA18
PA19
PA20
PA21
PA22
PA23
PA24
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FUNCTIONALITY
LEDQT2
MCU PIN
MCU PIN NAME
PA25
34
20
BUZZ-TC01
PB11
3.3.
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 3-3ꢀPin Configuration for Bit Bang SPI Commnunication Interface
FUNCTIONALITY
DBG_MOSI
DBG_SCK
MCU PIN
MCU PIN NAME
PA12
21
22
23
24
PA13
DBG_SS
PA14
DBG_MISO
PA15
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4.
Unit Assembly
There are two separate units for the demo kit:
•
•
Acrylic Front Panel
Base PCB
Figure 4-1ꢀ Board Stack-up
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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.
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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 6-1ꢀ 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.
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Figure 6-2ꢀ Connecting with EDBG for Programming using Atmel Studio
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7.
Connecting to QTouch Analyzer
Follow the steps below to connect the QTouch Anayzer to view touch data.
1. Connect the kit to PC using an mini USB cable.
2. Open QTouch Analyzer in Atmel Studio 6.
3. Select QDEBUG_DGI from the drop down menu and click on Connect.
Figure 7-1ꢀSelect QDEBUG_DGI
4. Click OK when the DGI settings screen pops up.
Figure 7-2ꢀDGI Settings Screen Pops Up
5. Click Start Reading.
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Figure 7-3ꢀCapturing Touch Signal
6. View the touch signal in the QTouch Analyzer.
Figure 7-4ꢀTouch Signal View in QTouch Analyzer
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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 8-1ꢀ Switch Position in the Kit
8.1.
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 noisy power supply.
There is a beep sound when the switch is moved from ON to OFF or vice versa.
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.
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9.
Board Operation
9.1.
Product Layout
Figure 9-1ꢀ 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”.
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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.
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10.
Operating Modes of the Kit
10.1. Application Flow
Figure 10-1ꢀ 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.
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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.
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Figure 10-2ꢀ Application Flow for the Settings Mode
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11.
Schematic
Figure 11-1ꢀMCU and Sensor Configuration Section
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Figure 11-2ꢀLED Segment, Buzzer, and Switch Section
Figure 11-3ꢀEDBG Headers and Connectors
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12.
PCB Design
Figure 12-1ꢀTop Layer
Figure 12-2ꢀBottom Layer
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13.
Bill of Materials
Table 13-1ꢀTop Level Bill of Materials
COMPONENT
QUANTITY
Acrylic Front Panel
1
1
1
4
6
6
SAM C20 QTouch Robustness Demo Base Board - PCBA
Atmel EDBG-PCBA
(Rubber Feet) Bump-on
Plastic Spacers 11.8mm
Nylon Screw 4.3mm
Table 13-2ꢀBill of Material for the Base Board
Designator
Quantity Value
Description
C107, C109, C112, C113
C108, C110
4
2
7
1μF
SMD Capacitor 0603
SMD Capacitor 0603
SMD Capacitor 0603
4.7μF
100nF
C111, C121, C302, C303,
C304, C305, C307
C114, C116, C117, C119
C115, C118
4
100nF
1μF
SMD Capacitor 0402
SMD Capacitor 0402
SMD Capacitor 0603
SMD Capacitor 0603
2
C120, C301
2
10μF
10nF
C201, C202, C203, C204,
C205, C206, C207, C208,
C209, C210
10
D101
1
2
4
1
1
1
1
1
2
EL17-21UYC/A3
C513A-WSS-CV0Y0151
SJ-5303
Yellow LED SMD 0805
5mm White LED_TH
D205, D206
E1, E2, E3, E4
J101
Adhesive feet, diam. 11.1mm
Atmel Generic EDBG module
Right Angle Header 2x5
Right Angle Header 2x5
Right Angle Header 1x3
Right Angle Header 1x2
EDBG module
J102
RT Pin Header 2X5
RT Pin Header 2X5
RT Pin Header 1X3
Pin header 1x2 right angle
SNT-100-BK-G
J103
J105
J300
JS2, JS301
Jumper cap for 2.54mm
pinheader
KEY101, KEY102, KEY103, 10
KEY104, KEY105, KEY106,
KEY107, KEY109, KEY110,
KEY114
Philipp Spring
Spring for touch applications
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Designator
L1, L101
LED201
Quantity Value
Description
2
1
BLM18PG471SN1
SMD RF inductor 0603
HDSP-H151
LED 7-SEG, Red, Common
Anode
LS1
1
1
ABT-402-RC
Buzzer
PCB1
SAMC20 QTR Demo Base SAMC20 QTR Demo Base
Board PCB Documentation Board PCB Documentation
Q18, Q211, Q212
3
BC847W
2N7002DW
1kΩ
NPN SMD BJT transistor
Dual N-Channel MOSFET
SMD Resistor 0603
Q200, Q201, Q202, Q203
4
R101, R102, R219, R301,
R302, R303, R304, R305,
R306, R307, R309, R310,
R314
13
R103
1
4.7kΩ
330Ω
0Ω
SMD Resistor 0603
SMD Resistor 0603
SMD Resistor 0402
R104, R105, R221, R222
4
R106, R108, R225, R226,
R227, R228, R229, R230,
R231, R232
10
R107, R109
2
8
100kΩ
1MΩ
SMD Resistor 0402
SMD Resistor 0402
R200, R201, R202, R203,
R204, R205, R206, R207
R208, R209, R214, R215,
R216, R217, R223, R224
8
330Ω
SMD Resistor 0402
R210, R211, R218
R212, R213, R220
SW1, SW2
3
3
2
1
2
1
510Ω
SMD Resistor 0402
SMD Resistor 0603
Slide Switch
10kΩ
SPDT
SW101
KMS223GPLFG
TXS0104ERGYR
SAMC20G18A-AN
SMT Side Actuator
Voltage Level Translator
MCU
U101, U102
U300
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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-QTouch-
General-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
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15.
Revision History
Doc Rev.
Date
Comments
42525A
09/2015
Initial document release.
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