Atmel ATAN0114 QT4 Xplained Pro Kit Extension Board User Guide
- June 9, 2024
- Atmel
Table of Contents
APPLICATION NOTE
Atmel QT4 Xplained Pro User Guide
ATAN0114
ATAN0114 QT4 Xplained Pro Kit Extension Board
Preface
Atmel® QT4 Xplained Pro kit is an extension board that enables evaluation of
self-capacitance mode proximity and touch using the peripheral touch
controller (PTC) module. The kit shows how easy it is to design a capacitive
touch board solution for the PTC without the need for any external components.
Figure 1. QT4 Xplained Pro
Introduction
Kit Contents
- 1 ⅹ ATQT4-XPRO
Features
- QTouch®
- Two buttons
- Two proximity sensors
- One unshielded sensor
- One driven shield sensor with external op amp driver
- LEDs
- One LED indicator for each self-capacitive button
- One LED indicator for each proximity sensor
- Op amp supply jumper
- Supply current monitoring of the driven shield op amp
- Xplained Pro hardware identification system (1)
Kit Overview
Atmel® QT4 Xplained Pro is an extension board designed specifically for
Xplained Pro MCU boards featuring an MCU with a built-in peripheral touch
controller. The extension board can be used to explore the touch functions on
the PTC module in self-capacitance (SC) mode only and includes both touch and
proximity functionality.
Two of the extension board sensors provide proximity detection. The first
sensor is unshielded. This sensor consists of a single electrode on the top
layer of the PCB. All copper shielding has been removed beneath the sensor
electrode. This sensor is response to touch/proximity from both sides of the
PCB, top and bottom. The second proximity sensor employs an active or driven
shield which consists of two electrodes a top-side sensor and a bottom-side
shield. The shield is driven by the MCU (located on the Xplained Pro
controller board) through an external op amp (Texas Instruments OPA357) on the
extension board.
The active shield provides two major benefits compared to the unshielded
sensor. First, the active shield suppresses all touch and proximity detection
from the bottom (shielded) side of the proximity sensor. Detection can only
occur from the top side of the PCB (sensor side). Second, the active shield
provides a modest increase in sensor detection range compared to the
unshielded sensor of the same size.
Figure 1-1. QT4 Xplained Pro Extension Board
Getting Started
Three Steps to Start Exploring the Atmel Xplained Pro Platform
- Download and install Atmel® Studio.
- Launch Atmel Studio.
- Connect QT4 Xplained Pro to an Xplained Pro MCU board and connect a USB cable to the DEBUG USB port on the Xplained Pro MCU board.
Connecting the QT4 Xplained Pro to the Xplained Pro MCU Board
Atmel QT4 Xplained Pro has been designed to be connected to the header marked
EXT1 on the Xplained Pro MCU board. Before touch application development,
download and install the Atmel QTouch Library and Atmel QTouch Composer from
the extension gallery in Atmel Studio. Once the Xplained Pro MCU board is
powered, the green power LED lights up and Atmel Studio auto-detects which
Xplained Pro MCU or extension board is connected. Relevant information such as
datasheets and kit documentation is displayed. You also have the option to
launch sample Atmel Software Framework (ASF) applications. The target device
is programmed and debugged by the on-board embedded debugger.
Note: No external programmer or debugger tool is needed.
Design Documentation and Related Links
The following list provides lists for the most relevant documents and software for QT4 Xplained Pro.
- Xplained Pro products (1) – Atmel Xplained Pro is a series of small, easy-to-use evaluation kits for 8- and 32-bit Atmel microcontrollers. It consists of a series of low cost MCU boards for evaluation and demonstration of features and capabilities of different MCU families.
- QT4 Xplained Pro User Guide (2)– PDF version of this User Guide.
- QT4 Xplained Pro Design Documentation (3) – Package containing schematics, BOM, assembly drawings, 3D plots, layer plots, etc.
- Atmel QTouch Library (4) – QTouch library to support Atmel AVR ® and ARM® -based microcontrollers.
- Atmel QTouch Composer (5) – Tool for developing capacitive buttons, sliders and wheel applications.
- Atmel Studio (6) – Free Atmel IDE for development of C/C++ and assembler code for Atmel microcontrollers.
Notes:
1. http://www.atmel.com/XplainedPro
2. http://www.atmel.com/Images/Atmel-9386-QT4-Xplained-Pro_User-Guide.pdf
3. http://www.atmel.com/Images/QT4-Xplained-Design-Documentation.zip
4. http://www.atmel.com/tools/QTOUCHLIBRARY.aspx
5. http://www.atmel.com/tools/atmel_qtouch.aspx
6. http://www.atmel.com/atmelstudio
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 that are integrated with Atmel Studio, have Atmel software framework (ASF) drivers and demo code and support data streaming and more. Xplained Pro MCU boards support a wide range of Xplained Pro extension boards that are connected through a set of standardized headers and connectors. Each extension board has an identification (ID) chip to uniquely identify which boards are mounted on an Xplained Pro MCU board. This information is used to present relevant user guides, application notes, datasheets and sample code through Atmel Studio. Available Xplained Pro MCU and extension boards can be purchased from The Atmel Store (1).
Hardware Identification System
All Xplained Pro compatible extension boards have an Atmel ATSHA204 Crypto
Authentication™ chip mounted. This chip contains information that identifies
the extension with its name and other additional data. When an Xplained Pro
extension board 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, provide relevant information, sample code and links to relevant
documents. Table 3-1 shows the data fields stored in the ID chip with sample
content.
Note: Actual data may differ.
Table 3-1. Xplained Pro ID Chip Content
| Data Field | Data Type | Example Content |
|---|---|---|
| Manufacturer | ASCII string | Atmel’\0’ |
| Product name | ASCII string | QT4 Xplained Pro’\0’ |
| Product revision | ASCII string | 03’\0’ |
| Product serial number | ASCII string | 2414030000000000’\0’ |
| Minimum voltage [mV] | uint16_t | 3000 |
| Maximum voltage [mV] | uint16_t | 3600 |
| Maximum current [mA] | uint16_t | 100 |
Standard Headers and Connectors
Xplained Pro Standard Extension Header
All Xplained Pro kits have one or more dual-row, 20-pin, 100mil extension
headers. Xplained Pro MCU boards have male headers while Xplained Pro
extensions have their female counterparts. Note that all pins are not always
connected.
However, all of the connected pins follow the defined pin-out described in
Table 3-2. The extension headers can be used to connect a wide variety of
Xplained Pro extensions to Xplained Pro MCU boards and to access the pins of
the target MCU on
Xplained Pro MCU board directly.
Table 3-2. Xplained Pro Extension Header
| Pin Number | Name | Description |
|---|---|---|
| 1 | ID | Communication line to the ID chip on the 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 positive part of differential
PWM
9| IRQ/GPIO| Interrupt request line and/or general purpose I/O
10| SPI_SS_B/GPIO| Slave select for SPI and/or general purpose I/O
11| TWI_SDA| Data line for two-wire interface. Always implemented, bus type
12| TWI_SCL| Clock line for two-wire interface. Always implemented, bus type
13| USART_RX| Receiver line of universal synchronous and asynchronous serial
receiver and transmitter
14| USART_TX| Transmitter line of universal synchronous and asynchronous
serial receiver and transmitter
15| SPI_SS_A| Slave select for SPI. Should be unique if possible
16| SPI_MOSI| Master-out-slave-in line of serial peripheral interface. Always
implemented, bus type
17| SPI_MISO| Master-out-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
J101 – Op Amp Supply
The driven shield op amp is powered by VCC_TARGET (3.3V) from the Xplained Pro
controller board. The jumper can be removed and replaced by a multimeter in
order to monitor the op amp current consumption.
Hardware User Guide
Headers and Connectors
QT4 Xplained Pro Extension Header
QT4 Xplained Pro uses one Xplained Pro standard extension header marked with
EXT1 in silkscreen. This header makes it possible to connect the board to an
Xplained Pro MCU board with a MCU that includes a PTC module. See Table 4-1
for the pin-out definition of the extension header.
Table 4-1. QT4 Xplained Pro Extension Header
| Pin Number | Name | Description |
|---|---|---|
| 1 | ID | Communication line to the ID chip on the extension board |
| 2 | GND | Ground |
| 3 | Y0 | Unshielded proximity sensor |
| 4 | Y1 | Driven shield proximity sensor |
| 5 | Y2 | Self-cap sensor, B2 |
| 6 | Y3 | Self-cap sensor, B1 |
| 7 | LED_0 | LED indicator, unshielded proximity sensor |
| 8 | LED_1 | LED indicator, B2 sensor |
| 9 | LED_2 | LED indicator, B1 sensor |
| 10 | LED_3 | LED indicator, driven shield proximity sensor |
| 11 | Unused | Not connected |
| 12 | Unused | Not connected |
| 13 | Unused | Not connected |
| 14 | Unused | Not connected |
| 15 | EN | Op amp enable |
| 16 | Unused | Not connected |
| 17 | Unused | Not connected |
| 18 | Unused | Not connected |
| 19 | GND | Ground |
| 20 | VCC | Power for extension board |
Peripherals
-
LEDs
There are 4 LEDs available on the QT4 Xplained Pro extension board that can be used to visualize the behavior of the touch and proximity sensors. Each sensor has its own indicator LED. All LEDs on the boards are active low, which means that the microcontroller needs to sink the corresponding IO lines to activate the LEDs. -
Sensors
The QT4 Xplained Pro has four sensors that can be used for touch/proximity demonstration: two touch buttons, one driven shield proximity sensor (using an op amp driver) and one unshielded proximity sensor. All four sensors are self- capacitive, copper PCB electrodes, each driven by a separate Y-line from the microcontroller. In this case, the self-capacitance of the sensor is measured to calculate touch.
This kit is only supported by Xplained Pro MCU boards that have a MCU with a built-in PTC and a matching pin-out that connects all extension sensors. MCU boards currently supported are the SAMD20/21 and the SAMDA1 series of Xplained Pro controller boards.
Table 4-2. Sensors
| Sensor | Dimensions (mm) | Shield Type |
|---|---|---|
| Button 1 | 15×15 | GND, internal plane, hatched |
| Button 2 | 15×15 | GND, internal plane, hatched |
| Proximity – Unshielded | 40×20 | None |
| Proximity – Driven shield | 40×20 | Actively driven by external op amp (Texas |
Instruments, OPA357). Solid plane copper plane, 60x40mm.
Hardware Revision History and Known Issues
Identifying Product ID and Revision
The revision and product identifier of Xplained Pro boards can be accessed
either through Atmel Studio or by looking at the sticker affixed to the bottom
of the PCB. An information window pops up when connecting an Xplained Pro MCU
board to a computer with Atmel ® Studio running. The first six digits of the
serial number listed under kit details contain the product identifier and
revision. Information about connected Xplained Pro extension boards also
appears in the Atmel kits window.
The same information can be found on the sticker on the bottom of the PCB.
Most kits print the identifier and revision in plain text as A09-nnnn\rr with
nnnn the identifier and rr the revision. Boards with limited space have a
sticker with only a QR code containing a serial number string. The serial
number string has the following format:
“nnnnrrssssssssss”
n = product identifier
r = revision
s = serial number
The kit identifier for QT4 Xplained Pro is 2414.
Revision 3
Revision 3 of QT4 Xplained Pro is the initial released version; there are no
known issues.
Please read the user guide for the supported kits or the datasheet of the
devices for any known issues regarding the peripheral touch controller.
Important Notice and Disclaimer for the Atmel Evaluation Board/Kit
This evaluation board/kit is intended for user’s internal development and evaluation purposes only. It is not a finished product and may not comply with technical or legal requirements that are applicable to finished products, including, without limitation, directives or regulations relating to electromagnetic compatibility, recycling (WEE), FCC, CE or UL. Atmel is providing this evaluation board/kit “AS IS” without any warranties or indemnities. The user assumes all responsibility and liability for handling and use of the evaluation board/kit including, without limitation, the responsibility to take any and all appropriate precautions with regard to electrostatic discharge and other technical issues. User indemnifies Atmel from any claim arising from user’s handling or use of this evaluation board/kit. Except for the limited purpose of internal development and evaluation as specified above, no license, express or implied, by estoppel or otherwise, to any Atmel intellectual property right is granted hereunder. ATMEL SHALL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RELATING TO USE OF THIS EVALUATION BOARD/KIT.
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