Xplained Pro Extension Headers

The SAMC21N 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 1. Extension Header EXT1
Pin on EXT1 SAMC21N pin Function Shared functionality
1 [ID] - - Communication line to the ID chip on an extension board.
2 [GND] - - Ground.
3 [ADC(+)] PB09 ADC0_AIN3 or SDADC_INP[1] or Y[15] Shield
4 [ADC(-)] PB08 ADC0_AIN2 or SDADC_INN[1] or Y[14] Shield
5 [GPIO1] PA10 SERCOM2 PAD[2] UART RTS or X[2]/Y[18] -
6 [GPIO2] PA11 SERCOM2 PAD[3] UART CTS or X[3]/Y[19] -
7 [PWM(+)] PB12 TC4/WO[0] or X[12]/Y[28] EDBG GPIO0
8 [PWM(-)] PB13 TC4/WO[1] or X[13]/Y[29] -
9 [IRQ/GPIO] PA22 IRQ6 or TC4/WO[0] or TCC1/WO[0] or X[10]/Y[26] EDBG GPIO1
10 [SPI_SS_B/GPIO] PA23 GPIO or TC4/WO[1] or TCC1/WO[1] or X[11]/Y[27] -
11 [TWI_SDA] PB16 SERCOM5 PAD[0] I2C SDA -
12 [TWI_SCL] PB17 SERCOM5 PAD[1] I2C SCL -
13 [USART_RX] PA13 SERCOM2 PAD[1] UART RX -
14 [USART_TX] PA12 SERCOM2 PAD[0] UART TX -
15 [SPI_SS_A] PC28 SERCOM1 PAD[1] SPI SS -
16 [SPI_MOSI] PA18 SERCOM1 PAD[2] SPI MOSI or X[6]/Y[22] -
17 [SPI_MISO] PC27 SERCOM1 PAD[0] SPI MISO -
18 [SPI_SCK] PA19 SERCOM1 PAD[3] SPI SCK or X[7]/Y[23] -
19 [GND] - - Ground.
20 [VCC] - - Power for extension board.
Table 2. Extension Header EXT2
Pin on EXT2 SAMC21N pin Function Shared functionality
1 [ID] - - Communication line to the ID chip on an extension board.
2 [GND] - - Ground.
3 [ADC(+)] PA08 ADC1_AIN[10] or X[0]/Y[16] -
4 [ADC(-)] PA09 ADC1_AIN[11] or X[1]/Y[17] -
5 [GPIO1] PA20 SERCOM3 PAD[2] UART RTS or X[8]/Y[24] -
6 [GPIO2] PA21 SERCOM3 PAD[3] UART CTS or X[9]/Y[25] -
7 [PWM(+)] PB30 TC0/WO[0] Shield
8 [PWM(-)] PB31 TC0/WO[1] Shield
9 [IRQ/GPIO] PC24 IRQ0/GPIO EDBG GPIO2
10 [SPI_SS_B/GPIO] PC25 GPIO -
11 [TWI_SDA] PA16 SERCOM1 PAD[0] I2C SDA EXT3, Shield, 2EDBG IC and Crypto Device
12 [TWI_SCL] PA17 SERCOM1 PAD[1] I2C SCL EXT3, Shield, 2EDBG IC and Crypto Device
13 [USART_RX] PB21 SERCOM3 PAD[1] UART RX -
14 [USART_TX] PB20 SERCOM3 PAD[0] UART TX -
15 [SPI_SS_A] PB03 SERCOM5 PAD[1] SPI SS or Y[9] -
16 [SPI_MOSI] PB00 SERCOM5 PAD[2] SPI MOSI or Y[6] -
17 [SPI_MISO] PB02 SERCOM5 PAD[0] SPI MISO or Y[8] -
18 [SPI_SCK] PB01 SERCOM5 PAD[3] SPI SCK or Y[7] -
19 [GND] - - Ground.
20 [VCC] - - Power for extension board.
Table 3. Extension Header EXT3
Pin on EXT3 SAMC21N pin Function Shared functionality
1 [ID] - - Communication line to the ID chip on an extension board.
2 [GND] - - Ground.
3 [ADC(+)] PB07 ADC1_AIN[9] or SDADC_INP[2] or Y[13] -
4 [ADC(-)] PB06 ADC1_AIN[8] or SDADC_INN[2] or Y[12] -
5 [GPIO1] PC18 SERCOM6 PAD[2] UART RTS -
6 [GPIO2] PC19 SERCOM6 PAD[3] UART CTS -
7 [PWM(+)] PB22 TCC1/WO[2] -
8 [PWM(-)] PB23 TCC1/WO[3] -
9 [IRQ/GPIO] PA28 IRQ8/GPIO EDBG GPIO3
10 [SPI_SS_B/GPIO] PA27 GPIO -
11 [TWI_SDA] PA16 SERCOM1 PAD[0] I2C SDA EXT2, Shield, 2EDBG IC and Crypto Device
12 [TWI_SCL] PA17 SERCOM1 PAD[1] I2C SCL EXT2, Shield, 2EDBG IC and Crypto Device
13 [USART_RX] PC17 SERCOM6 PAD[1] UART RX -
14 [USART_TX] PC16 SERCOM6 PAD[0] UART TX -
15 [SPI_SS_A] PC13 SERCOM7 PAD[1] SPI SS -
16 [SPI_MOSI] PC14 SERCOM7 PAD[2] SPI MOSI Shield, Shield(2), and EDBG SPI
17 [SPI_MISO] PC12 SERCOM7 PAD[0] SPI MISO Shield, Shield(2), and EDBG SPI
18 [SPI_SCK] PC11 SERCOM7 PAD[3] SPI SCK Shield, Shield(2), and EDBG SPI
19 [GND] - - Ground.
20 [VCC] - - Power for extension board.
Parent topic: Connectors