Atmel I/O1 Xplained Pro User manual
Atmel MCUs
I/O1 Xplained Pro
USER GUIDE
Preface
Atmel® I/O1 Xplained Pro is an extension board to the Atmel Xplained Pro
evaluation platform. I/O1 Xplained Pro is designed to give a wide variety of
functionality to Xplained Pro MCU boards including a microSD card, a
temperature sensor, a light sensor, and more.
Atmel-42078B-IO1-Xplained-Pro_User Guide-10/2015
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 User Guide................................................................................................7
4.1. Electrical Characteristics.............................................................................................................. 7
4.2. Headers and Connectors..............................................................................................................7
4.2.1. I/O1 Xplained Pro Extension Header.............................................................................7
4.2.2. Power Header................................................................................................................8
4.2.3. GPIO Header................................................................................................................. 8
4.2.4. UART Header................................................................................................................ 9
4.3. Peripherals................................................................................................................................... 9
4.3.1. LED................................................................................................................................9
4.3.2. Low Pass Filter.............................................................................................................. 9
4.3.3. Temperature Sensor...................................................................................................... 9
4.3.4. microSD Card Connector.............................................................................................10
4.3.5. Light Sensor.................................................................................................................11
5. Hardware Revision History and Known Issues........................................................12
5.1. Identifying Product ID and Revision........................................................................................... 12
5.2. Revision 3...................................................................................................................................12
6. Document Revision History..................................................................................... 13
7. Evaluation Board/kit Important Notice..................................................................... 14
Atmel I/O1 Xplained Pro [USER GUIDE]
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1. Introduction
1.1. Features
•microSD card connector
–2GB microSD card included
–Accessed with SPI interface
•PWM
–LED control
–PWM → Low pass filter → ADC
•ADC
–PWM → Low pass filter → ADC
–Light sensor
•UART
–Loopback interface via pin header
•TWI
–AT30TSE758 temperature sensor with EEPROM
•Xplained Pro hardware identification system
1.2. Kit Overview
Atmel I/O1 Xplained Pro extension board is a generic extension board for the Xplained Pro platform. It
connects to any Xplained Pro standard extension header on any Xplained Pro MCU board.
The extension board utilizes all functions on the standard Xplained Pro extension header to further
enhance the feature set of Xplained Pro MCU boards.
Figure 1-1 I/O1 Xplained Pro Extension Board
Atmel I/O1 Xplained Pro [USER GUIDE]
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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 I/O1 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 Xplained Pro MCU kit 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 I/O1 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.
•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.
•I/O1 Xplained Pro on Atmel web page - Atmel website link.
Atmel I/O1 Xplained Pro [USER GUIDE]
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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/
GPIO
Slave select for SPI and/or general purpose I/O
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 User Guide
4.1. Electrical Characteristics
I/O1 Xplained Pro can be connected to several Xplained Pro MCU boards and manually connected to
other hardware. Xplained Pro MCU board(s) that does not have 3.3V as it's primary target voltage will
read all ID devices on connected extensions to check if they support the target voltage before enabling it
to the extension headers. The table below shows the static content written in the ID chip.
Table 4-1 I/O1 Xplained Pro ID Chip Content
Data field Content
Product name I/O1 Xplained Pro
Minimum operation voltage 2.0V
Maximum operation voltage 3.6V
Maximum current 10mA
Related Links
Hardware Identification System on page 5
4.2. Headers and Connectors
4.2.1. I/O1 Xplained Pro Extension Header
I/O1 Xplained Pro implements one standard Xplained Pro extension header marked with EXT in
silkscreen. This header makes it possible to connect the board to any Xplained Pro MCU board. The pin-
out definition for the extension header can be seen in the table below.
Table 4-2 I/O1 Xplained Pro Extension Header
Pin
on
EXT
Function Description
1 ID Communication line to ID chip
2 GND Ground
3 LIGHTSENSOR Light sensor output (ADC)
4 LP_OUT Low pass filter output (ADC)
5 GPIO1 General Purpose I/O pin (GPIO)
6 GPIO2 General Purpose I/O pin (GPIO)
7 LED LED control (PWM)
8 LP_IN Low pass filter input (PWM)
9 TEMP_ALERT ALERT pin (Pin 3) of temperature sensor chip (IRQ)
10 microSD_DETECT Detect pin on microSD card connector (GPIO)
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Pin
on
EXT
Function Description
11 TWI SDA Data line of TWI interface, connected to SDA pin (Pin 1) of temperature
sensor chip
12 TWI SCL Clock line of TWI interface, connected to SCL pin (Pin 2) of temperature
sensor chip
13 UART RX Receive pin of target MCU UART interface
14 UART TX Transmit pin of target MCU UART interface
15 microSD_SS Chip select signal, connected to DAT3 pin on microSD card connector
16 SPI_MOSI Master Out, Slave In signal of target MCU SPI interface. Connected to
CMD pin on microSD card connector.
17 SPI_MISO Master In, Slave Out signal of target MCU SPI interface. Connected to D0
pin on microSD card connector.
18 SPI_SCK Clock line of SPI interface. Connected to CLK pin on microSD card
connector.
19 GND Ground
20 VCC Target supply voltage
4.2.2. Power Header
The two pin power header on IO1 Xplained Pro can be used together with the GPIO pins to connect
external circuitry or probe the voltage on the board. The pins of the header are marked in silk screen with
VTG for target voltage and GND for ground.
Info: The two pin power header should not be used to apply power to I/O1 Xplained Pro when
connected to an Xplained Pro MCU board as it will get power from the Xplained Pro MCU board
through the 20-pin extension connector.
Table 4-3 Power Header
Silk screen marking Description
VTG Target voltage, main voltage of the I/O1 Xplained Pro extension board
GND Ground
4.2.3. GPIO Header
I/O1 Xplained Pro features a 2-pin header with access to the two generic GPIO lines on the 20-pin
extension connector. These lines are routed from the 20-pin extension header through 39Ω series
resistors to the 2-pin GPIO header.
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Table 4-4 GPIO Header
Pin on EXT connector Silk screen marking
5 GPIO1
6 GPIO2
4.2.4. UART Header
I/O1 Xplained Pro features a 2-pin header with access to the UART pins of the 20-pin extension
connector. This two pin header comes with a jumper mounted to enable the UART to work in loopback
mode. Both UART lines are terminated with 39Ω series resistors.
Table 4-5 UART Header
Pin on EXT connector Silk screen marking
14 TX
13 RX
4.3. Peripherals
4.3.1. LED
There is one yellow LED available on the I/O1 Xplained Pro extension board that can be controlled by
Pulse Width Modulation (PWM) or regular GPIO operation. The LED can be activated by driving the
connected I/O line to GND.
Table 4-6 LED Connection
Pin on EXT connector Silk screen marking
7 LED
4.3.2. Low Pass Filter
I/O1 Xplained Pro features a first order low-pass filter with a cutoff frequency of ~2340Hz. It is realized
with a 680Ω resistor and a 100nF capacitor. This filter can be used to filter a PWM generated signal which
can be sampled with an ADC pin.
Table 4-7 Low Pass Filter Connections
Pin on EXT connector Silk screen marking
8 PWM
4 ADC
4.3.3. Temperature Sensor
I/O1 Xplained Pro extension board features an Atmel AT30TSE758 temperature sensor chip with an 8kb
serial EEPROM inside. The sensor includes programmable high and low temperature alarms, user-
selectable temperature resolution up to 12 bits, and an I2C/SMBus™ compatible serial interface.
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Table 4-8 Temperature Sensor Connections
Pin on EXT
connector
Pin name AT30TSE758
temperature
sensor pin
Comment
11 SDA 1 Data line of serial interface
12 SCL 2 Clock line of serial interface
9 ALERT 3 Temperature alarm signalling pin
GND GND 4
- A2 5 Address line for serial interface, by default pulled
high
- A1 6 Address line for serial interface, by default pulled
high
- A0 7 Address line for serial interface, by default pulled
high
VCC VCC 8
The temperature sensor has two TWI addresses; one for the temperature sensor and one for the
EEPROM. The addresses are "0b1001 A2 A1 A0" for the temperature sensor and "0b1010 A2 A1 A0" for
the EEPROM. The address selection lines (A2, A1, and A0) of the temperature sensor chip is by default
pulled high through 100kΩ resistors, which makes the default addresses 0b1001111 and 0b1010111.
Soldering the straps on the back of the I/O1 Xplained Pro board for An will alter that bit in the address to
zero. Each strap is marked in silkscreen with A0, A1, and A2 as shown in the picture below. When
communicating with the EEPROM parts of the TWI address is used as a page address. For more details,
see the device (AT30TSE752A/754A/758A) datasheet.
Figure 4-1 Temperature Sensor TWI Address
4.3.4. microSD Card Connector
I/O1 Xplained Pro features a microSD card connector that connects to cards via a SPI interface.
Examples on how to use microSD cards and an example SD card stack can be found through ASF, for
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