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.
Table 3-4. 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
I
2
C_SDA
Data line for I
2
C interface. Always implemented, bus type.
12
I
2
C_SCL
Clock line for I
2
C 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
3.4.2.
Xplained Pro Power Header
The power header can be used to connect external power to the SAMHA1G16A Xplained Pro kit. The kit
will automatically detect and switch to any external power if supplied. The power header can also be used
as supply for external peripherals or extension boards. Care must be taken not to exceed the total current
limitation of the on-board regulator when using the 3.3V pin.
Atmel SAMHA1G16A Xplained Pro [USER GUIDE]
Atmel-00001-SAMHA1G16A-Xplained-Pro_User Guide-11/2014
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