Pin Number
Name
Description
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 SAMC21N 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 or 5.0V pin.
Table 3-5. Xplained Pro Power Header
Pin Number
Pin Name
Description
1
VEXT_P5V0
External 5V input
2
GND
Ground
3
VCC_P5V0
Unregulated 5V (output, derived from one of the input
sources)
4
VCC_P3V3
Regulated 3.3V (output, used as main power supply for the
kit)
SAMC21N Xplained Pro
©
2017 Microchip Technology Inc.
User Guide
DS70005318A-page 11
