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.
Atmel I/O1 Xplained Pro [USER GUIDE]
Atmel-42078B-IO1-Xplained-Pro_User Guide-10/2015
8
