Atmel SAM C21 Xplained Pro User Manual

4.2.1. Xplained Pro Extension Headers
The SAM C21 Xplained Pro headers EXT1, EXT2, and EXT3 offers access to the I/O of the
microcontroller in order to expand the board e.g. by connecting extensions to the board. These headers
are based on the standard extension header specified in Xplained Pro Standard Extension Header on
page 9. The headers have a pitch of 2.54mm.
Table 4-1 Extension Header EXT1
Pin on EXT1 SAM C21
pin
Function Shared functionality
1 [ID] - - Communication line to the
ID chip on an extension
board.
2 [GND] - - Ground.
3 [ADC(+)] PB09 INP1 Shield
4 [ADC(-)] PB08 INN1 Shield
5 [GPIO1] PA20 GPIO Shield
6 [GPIO2] PA21 GPIO Shield
7 [PWM(+)] PB12 TC0/WO0 Shield and EDBG GPIO0
8 [PWM(-)] PB13 TC0/WO1 Shield
9 [IRQ/GPIO] PB14 IRQ14/GPIO -
10 [SPI_SS_B/GPIO] PB15 GPIO -
11 [TWI_SDA] PA12 SERCOM2 PAD[0] I
2
C SDA EXT2, EXT3, Shield, Crypto
Device, and EDBG I
2
C
12 [TWI_SCL] PA13 SERCOM2 PAD[1] I
2
C SCL EXT2, EXT3, Shield, Crypto
Device, and EDBG I
2
C
13 [USART_RX] PA23 SERCOM3 PAD[1] UART
RX
EXT2, EXT3, and Shield
14 [USART_TX] PA22 SERCOM3 PAD[0] UART
TX
EXT2, EXT3, and Shield
15 [SPI_SS_A] PA17 SERCOM1 PAD[1] SPI SS -
16 [SPI_MOSI] PA18 SERCOM1 PAD[2] SPI
MOSI
-
17 [SPI_MISO] PA16 SERCOM1 PAD[0] SPI
MISO
-
18 [SPI_SCK] PA19 SERCOM1 PAD[3] SPI SCK -
19 [GND] - - Ground.
20 [VCC] - - Power for extension board.
Atmel SAM C21 Xplained Pro [USER GUIDE]
Atmel-42460C-SAM C21 Xplained Pro_User Guide-10/2015
13
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Atmel SAM C21 Xplained Pro Specifications

General

Brand	Atmel
Model	SAM C21 Xplained Pro
Category	Motherboard
Language	English