Atmel QTouch
QT3 Xplained Pro
USER GUIDE
Preface
The Atmel® QT3 Xplained Pro is an extension board, which enables the
evaluation of a capacitive touch 12 key numpad in mutual capacitance
configuration. The board is designed to use the Peripheral Touch Controller
(PTC) in Atmel microcontrollers. The board shows how easy it is to design a
capacitive touch solution for the PTC without the need for any external
components. The kit includes one board with a 3 by 4 touch key matrix and a
4 by 4 LED matrix for a visual feedback of the touch.
Atmel-42404A-QT3-Xplained-Pro_User Guide-08/2015
Table of Contents
Preface............................................................................................................................ 1
1. Introduction................................................................................................................3
1.1. Features....................................................................................................................................... 3
1.2. Kit Overview................................................................................................................................. 3
2. Getting Started...........................................................................................................4
2.1. Xplained Pro Quick Start.............................................................................................................. 4
2.2. Design Documentation and Relevant Links................................................................................. 4
3. Xplained Pro.............................................................................................................. 5
3.1. Hardware Identification System....................................................................................................5
3.2. Xplained Pro Headers and Connectors........................................................................................5
3.2.1. Xplained Pro Standard Extension Header..................................................................... 5
4. Hardware Users Guide.............................................................................................. 7
4.1. Headers and Connectors..............................................................................................................7
4.1.1. QT3 Xplained Pro Extension Headers...........................................................................7
4.2. Peripherals................................................................................................................................... 8
4.2.1. LEDs.............................................................................................................................. 8
4.2.2. QTouch Buttons........................................................................................................... 10
5. Hardware Revision History and Known Issues........................................................ 11
5.1. Identifying Product ID and Revision............................................................................................11
5.2. Revision 2...................................................................................................................................11
6. Document Revision History..................................................................................... 12
7. Evaluation Board/kit Important Notice..................................................................... 13
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1. Introduction
1.1. Features
• 3x4 Mutual Capacitance QTouch® keypad matrix
• 17 LEDs
– One LED for each key
– Two LEDs for logo
– Three status LEDs
• Xplained Pro hardware identification system
1.2. Kit Overview
The Atmel QT3 Xplained Pro extension board is designed specifically for Xplained Pro MCU boards
featuring a microcontroller with a built-in peripheral touch controller. The extension board can be used to
explore the touch functions on the PTC module in mutual capacitance mode.
Figure 1-1 QT3 Xplained Pro Extension Board
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2. Getting Started
2.1. Xplained Pro Quick Start
Three steps to start exploring the Atmel Xplained Pro platform:
1. Download Atmel Studio.
2. Launch Atmel Studio.
3. Connect QT3 Xplained Pro to an Xplained Pro MCU board and connect a USB cable to the DEBUG
USB port on the Xplained Pro MCU board.
When the Atmel QT3 Xplained Pro is connected to your computer for the first time, the operating system
will perform a driver software installation. The driver file supports both 32- and 64-bit versions of
Microsoft® Windows® XP, Windows Vista®, Windows 7, and Windows 8.
Once the Xplained Pro MCU board is powered the green power LED will be lit and Atmel Studio will auto
detect which Xplained Pro MCU- and extension board(s) are connected. Atmel Studio will present
relevant information like datasheets and kit documentation. The kit landing page in Atmel Studio also has
the option to launch Atmel Software Framework (ASF) example applications for the kit. The target device
is programmed and debugged by the on-board Embedded Debugger and therefore no external
programmer or debugger tool is needed.
2.2. Design Documentation and Relevant Links
The following list contains links to the most relevant documents and software for QT3 Xplained Pro:
• Xplained Pro products - Atmel Xplained Pro is a series of small-sized and easy-to-use evaluation
kits for Atmel microcontrollers and other Atmel products. It consists of a series of low cost MCU
boards for evaluation and demonstration of features and capabilities of different MCU families.
• Atmel Studio - Free Atmel IDE for development of C/C++ and assembler code for Atmel
microcontrollers.
• EDBG User Guide - User guide containing more information about the on-board Embedded
Debugger.
• Atmel QTouch Library - QTouch Library for Atmel AVR® and ARM® - based microcontrollers.
• Atmel QTouch Composer - Tool for developing capacitive buttons, sliders, and wheels
applications.
• Atmel Data Visualizer - Atmel Data Visualizer is a program used for processing and visualizing
data. Data Visualizer can receive data from various sources such as the Embedded Debugger Data
Gateway Interface found on Xplained Pro boards, and COM ports.
• Design Documentation - Package containing CAD source, schematics, BOM, assembly drawings,
3D plots, layer plots etc.
• Hardware Users Guide in PDF format - PDF version of this User Guide.
• QT3 Xplained Pro in the Atmel store - Atmel Store link.
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3. Xplained Pro
Xplained Pro is an evaluation platform that provides the full Atmel microcontroller experience. The
platform consists of a series of Microcontroller (MCU) boards and extension boards which are integrated
with Atmel Studio, have Atmel Software Framework (ASF) drivers and demo code, support data
streaming, and more. Xplained Pro MCU boards support a wide range of Xplained Pro extension boards
which are connected through a set of standardized headers and connectors. Each extension board has
an identification (ID) chip to uniquely identify which boards are connected to an Xplained Pro MCU board.
This information is used to present relevant user guides, application notes, datasheets, and example
code through Atmel Studio.
3.1. Hardware Identification System
All Xplained Pro compatible extension boards have an Atmel ATSHA204 CryptoAuthentication™ chip
mounted. This chip contains information that identifies the extension with its name and some extra data.
When an Xplained Pro extension is connected to an Xplained Pro MCU board the information is read and
sent to Atmel Studio. The Atmel Kits extension, installed with Atmel Studio, will give relevant information,
code examples, and links to relevant documents. Table 3-1 Xplained Pro ID Chip Content on page 5
shows the data fields stored in the ID chip with example content.
Table 3-1 Xplained Pro ID Chip Content
Data field Data type Example content
Manufacturer ASCII string Atmel'\0'
Product Name ASCII string Segment LCD1 Xplained Pro'\0'
Product Revision ASCII string 02'\0'
Product Serial Number ASCII string 1774020200000010’\0’
Minimum Voltage [mV] uint16_t 3000
Maximum Voltage [mV] uint16_t 3600
Maximum Current [mA] uint16_t 30
3.2. Xplained Pro Headers and Connectors
3.2.1. Xplained Pro Standard Extension Header
All Xplained Pro kits have one or more dual row, 20-pin, 100mil extension header. Xplained Pro MCU
boards have male headers, while Xplained Pro extensions have their female counterparts. Note that all
pins are not always connected. All connected pins follow the defined pin-out description in Table 3-2
Xplained Pro Standard Extension Header on page 6.
The extension headers can be used to connect a variety of Xplained Pro extensions to Xplained Pro MCU
boards or to access the pins of the target MCU on Xplained Pro MCU boards directly.
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Table 3-2 Xplained Pro Standard Extension Header
Pin number Name Description
1 ID Communication line to the ID chip on an extension board
2 GND Ground
3 ADC(+) Analog to digital converter, alternatively positive part of differential
ADC
4 ADC(-) Analog to digital converter, alternatively negative part of differential
ADC
5 GPIO1 General purpose I/O
6 GPIO2 General purpose I/O
7 PWM(+) Pulse width modulation, alternatively positive part of differential
PWM
8 PWM(-) Pulse width modulation, alternatively negative part of differential
PWM
9 IRQ/GPIO Interrupt request line and/or general purpose I/O
10 SPI_SS_B/
Slave select for SPI and/or general purpose I/O
GPIO
11 I2C_SDA Data line for I2C interface. Always implemented, bus type.
12 I2C_SCL Clock line for I2C interface. Always implemented, bus type.
13 UART_RX Receiver line of target device UART
14 UART_TX Transmitter line of target device UART
15 SPI_SS_A Slave select for SPI. Should preferably be unique.
16 SPI_MOSI Master out slave in line of serial peripheral interface. Always
implemented, bus type.
17 SPI_MISO Master in slave out line of serial peripheral interface. Always
implemented, bus type.
18 SPI_SCK Clock for serial peripheral interface. Always implemented, bus type.
19 GND Ground
20 VCC Power for extension board
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4. Hardware Users Guide
4.1. Headers and Connectors
4.1.1. QT3 Xplained Pro Extension Headers
QT3 Xplained Pro implements two Xplained Pro Standard Extension Header on page 5 marked with
EXT1 and EXT2 in silkscreen. These headers make it possible to connect the board to an Xplained Pro
MCU board with an MCU featuring a PTC module. The pin-out definition for the extension headers can be
seen in Table 4-1 QT3 Xplained Pro Extension Header EXT1 on page 7 and Table 4-2 QT3 Xplained
Pro Extension Header EXT2 on page 8.
The X-sensors of the touch pad are available on both EXT1 and EXT2 header on the kit for supporting
Xplained Pro MCU kits with and without the EXT2 header. Driving the LEDs require both headers to be
connected.
Table 4-1 QT3 Xplained Pro Extension Header EXT1
Pin on EXT1 Function Description
1 ID Communication line to the ID chip
2 GND Ground
3 Y LINE 1 For keypad: "1", "2", and "3"
4 Y LINE 2 For keypad: "4", "5", and "6"
5 Y LINE 3 For keypad: "7", "8", and "9"
6 Y LINE 4 For keypad: "C", "0", and "#"
7 X LINE 1 X-line 1 (For use with MCU kits without EXT2 header)
8 X LINE 2 X-line 2 (For use with MCU kits without EXT2 header)
9 X LINE 3 X-line 3 (For use with MCU kits without EXT2 header)
10 Not Connected
11 Not Connected
12 Not Connected
13 Not Connected
14 Not Connected
15 LED COL1 LED driver for column 1
16 LED COL2 LED driver for column 2
17 LED COL3 LED driver for column 3
18 LED COL4 LED driver for column 4
19 GND Ground
20 VCC Target supply voltage
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Table 4-2 QT3 Xplained Pro Extension Header EXT2
Pin on EXT1 Function Description
1 ID Communication line to the ID chip
2 GND Ground
3 X LINE 1 For keypad: "1", "4", "7", and "C"
4 X LINE 2 For keypad: "2", "5", "8", and "0"
5 X LINE 3 For keypad: "3", "6"," 9", and "#"
6 Not Connected
7 LED ROW1
8 LED ROW2
9 LED ROW3
10 LED ROW4
11 Not Connected
12 Not Connected
13 Not Connected
14 Not Connected
15 Not Connected
16 Not Connected
17 Not Connected
18 Not Connected
19 GND Ground
20 Not Connected
4.2. Peripherals
4.2.1. LEDs
There are 17 white LEDs arranged in a 4x4 matrix on the QT3 Xplained Pro extension board which can
be used to visualize a touch in the QTouch sensor. All LEDs on the boards must be driven by the I/O of
the target controller on an MCU board.
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Figure 4-1 LED Connection Diagram
COL1 COL2 COL3 COL4
VCC
ROW1
ROW2
ROW3
ROW4
1
4
7
C
2
5
8
0
3
6
9
#
Status LED1
Status LED2
Status LED3
Logo’s
COL1
COL2
COL3
COL4
ROW1
ROW2
ROW3
ROW4
COL1:XX COL2:XX COL3:XX COL4:XX COL1:XX
COL1:XX COL2:XX COL3:XX COL4:XX COL1:XX
COL1:XX COL2:XX COL3:XX COL4:XX COL1:XX
COL1:XX COL2:XX COL3:XX COL4:XX COL1:XX
The LEDs must be driven with multiplexing techniques. Drive only one colum at the time by pulling the
respective COL line low and keep the other COL lines high. The columns are driven with a FET gate and
can therefore deliver current to all the LEDs in that column. The LED rows are connected directly to the
MCU and can only sink one LED at the time. See Figure 4-2 LED Driving Waveform on page 9 for an
illustration of the driving waveform.
Figure 4-2 LED Driving Waveform
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Table 4-3 LED Connection on EXT1
Pin on EXT1 Function Description
15 LED COL1 Column 1, driving LEDs backlight for keypad: "1", "4", "7", and
"C"
16 LED COL2 Column 2, driving LEDs backlight for keypad: "2", "5", "8", and
"0"
17 LED COL3 Column 3, driving LEDs backlight for keypad: "3", "6", "9", and
"#"
18 LED COL4 Column 4, driving status LED1, 2, and 3, and Logo's backlight
Table 4-4 LED Connection on EXT2
Pin on EXT2 Function Description
7 LED ROW1 Row 1, driving LEDs backlight for keypad: "1", "2", "3", and
one status LED1
8 LED ROW2 Row 2, driving LEDs backlight for keypad: "4", "5", "6", and
one status LED2
9 LED ROW3 Row 3, driving LEDs backlight for keypad: "7", "8", "9", and
one status LED3
10 LED ROW4 Row 4, driving LEDs backlight for keypad: "C", "0", "#", and
4.2.2. QTouch Buttons
QT3 Xplained Pro has one 3x4 mutual capacitance touch button sensor array, which requires seven
touch lines for the 12 keys in the numberic keypad.
The Y-lines are only available on EXT1 on the kit, while the X-lines are available on both header. This
makes the touch buttons compatible with MCU kits without the EXT2 header.
Info: To get started with QTouch, refer to Atmel QTouch Library and Atmel QTouch Composer.
Logo's
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5. Hardware Revision History and Known Issues
5.1. Identifying Product ID and Revision
The revision and product indentifier of Xplained Pro boards can be found in two ways; either through
Atmel Studio or by looking at the sticker on the bottom side of the PCB.
By connecting an Xplained Pro MCU board to a computer with Atmel Studio running, an information
window will pop up. The first six digits of the serial number, which is listed under kit details, contain the
product identifier and revision. Information about connected Xplained Pro extension boards will also
appear in the Atmel Kit's window.
The same information can be found on the sticker on the bottom side of the PCB. Most kits will print the
identifier and revision in plain text as A09-nnnn\rr, where nnnn is the identifier and rr is the revision.
Boards with limited space have a sticker with only a QR-code, which contains a serial number string.
The serial number string has the following format:
"nnnnrrssssssssss"
n = product identifier
r = revision
s = serial number
The product indentifier for QT3 Xplained Pro is A09-2329.
5.2. Revision 2
Revision 2 is the initially released revision, there are no known issues.
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6. Document Revision History
Doc. rev. Date Comment
42404A 08/2015 Initial document release.
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7. Evaluation Board/kit Important Notice
This evaluation board/kit is intended for use for FURTHER ENGINEERING, DEVELOPMENT,
DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is not a finished product and may not
(yet) comply with some or any technical or legal requirements that are applicable to finished products,
including, without limitation, directives regarding electromagnetic compatibility, recycling (WEEE), FCC,
CE or UL (except as may be otherwise noted on the board/kit). Atmel supplied this board/kit "AS IS,"
without any warranties, with all faults, at the buyer's and further users' sole risk. The user assumes all
responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies Atmel
from all claims arising from the handling or use of the goods. Due to the open construction of the
product, it is the user's responsibility to take any and all appropriate precautions with regard to
electrostatic discharge and any other technical or legal concerns.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER USER NOR ATMEL
SHALL BE LIABLE TO EACH OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES.
No license is granted under any patent right or other intellectual property right of Atmel covering or
relating to any machine, process, or combination in which such Atmel products or services might be or
are used.
Mailing Address:
Atmel Corporation
1600 Technology Drive
San Jose, CA 95110
USA
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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-42404A-QT3-Xplained-Pro_User Guide-08/2015
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