SAMC21 datasheet(14/46 Pages) ATMEL

14 / 46 page

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. The

headers have a pitch of 2.54mm.

Table 4-1. Extension Header EXT1

Pin on EXT1

SAM C21

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] I2C SDA EXT2, EXT3, Shield, Crypto

Device, and EDBG I2C

12 [TWI_SCL]

PA13

SERCOM2 PAD[1] I2C SCL

EXT2, EXT3, Shield, Crypto

Device, and EDBG I2C

13 [USART_RX]

PA23

SERCOM3 PAD[1] UART

EXT2, EXT3, and Shield

14 [USART_TX]

PA22

SERCOM3 PAD[0] UART

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-42460D-SAM-C21-Xplained-Pro_User Guide-08/2016

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