Atmel SAM C21 Xplained Pro User Manual

Table 4-3 Extension Header EXT3
Pin on EXT3 SAM C21
pin
Function Shared functionality
1 [ID] - - Communication line to the
ID chip on an extension
board.
2 [GND] - - Ground.
3 [ADC(+)] PB07 AIN9/INP2 Shield
4 [ADC(-)] PB06 AIN8/INN2 Shield
5 [GPIO1] PB04 GPIO Shield
6 [GPIO2] PB05 GPIO Shield
7 [PWM(+)] PA14 TC4/WO0 Crystal footprint
8 [PWM(-)] PA15 TC4/WO1 User LED and Crystal
footprint
9 [IRQ/GPIO] PA28 IRQ8/GPIO User Button and EDBG
GPIO3
10 [SPI_SS_B/GPIO] PA27 GPIO Shield
11 [TWI_SDA] PA12 SERCOM2 PAD[0] I
2
C SDA EXT1, EXT2, Shield, Crypto
Device, and EDBG I
2
C
12 [TWI_SCL] PA13 SERCOM2 PAD[1] I
2
C SCL EXT1, EXT2, Shield, Crypto
Device, and EDBG I
2
C
13 [USART_RX] PA23 SERCOM3 PAD[1] UART
RX
EXT1, EXT2, and Shield
14 [USART_TX] PA22 SERCOM3 PAD[0] UART
TX
EXT1, EXT2, and Shield
15 [SPI_SS_A] PA02 GPIO DAC Header
16 [SPI_MOSI] PB00 SERCOM5 PAD[2] SPI
MOSI
EXT2, Shield, Shield(2), and
EDBG SPI
17 [SPI_MISO] PB02 SERCOM5 PAD[0] SPI
MISO
EXT2, Shield, Shield(2), and
EDBG SPI
18 [SPI_SCK] PB01 SERCOM5 PAD[3] SPI SCK EXT2, Shield, Shield(2), and
EDBG SPI
19 [GND] - - Ground.
20 [VCC] - - Power for extension board.
4.2.2. Arduino Connectors
SAM C21 Xplained Pro implements Arduino shield connectors based on the Arduino Uno. All references
to Arduino pin names are taken from the official Arduino schematics of the Arduino Uno.
Atmel SAM C21 Xplained Pro [USER GUIDE]
Atmel-42460C-SAM C21 Xplained Pro_User Guide-10/2015
15
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Atmel SAM C21 Xplained Pro Specifications

General

Brand	Atmel
Model	SAM C21 Xplained Pro
Category	Motherboard
Language	English