4.1.1 Xplained Pro Standard Extension Header

The SAM D11 Xplained Pro header EXT1 offers access to the I/O of the microcontroller in order to expand the board e.g. by connecting extensions to the board. This header is based on the standard extension header specified in Table 3-4. The header has a pitch of 2.54mm.

Table 4-1. Extension Header EXT1
Pin on EXT1SAM D11 pinFunctionShared functionality
1 [ID]--Communication line to ID chip on extension board.
2 [GND]--GND
3 [ADC(+)]PA02AIN[0]QTouch Button 1
4 [ADC(-)]PA03AIN[1]QTouch Button 2
5 [GPIO1]PA04GPIO
6 [GPIO2]PA05GPIO
7 [PWM(+)]PA16TC1/WO[0]LED0 and EDBG GPIO
8 [PWM(-)]PA17TC1/WO[1]EDBG GPIO
9 [IRQ/GPIO]PA14NMISW0 and EDBG GPIO
10 [SPI_SS_B/GPIO]PA15GPIOEDBG GPIO
11 [TWI_SDA]PA22SERCOM1 PAD[0] I²C SDAEDBG I²C
12 [TWI_SCL]PA23SERCOM1 PAD[1] I²C SCLEDBG I²C
13 [USART_RX]PA11SERCOM2 PAD[3] UART RXEDBG CDC
14 [USART_TX]PA10SERCOM2 PAD[2] UART TXEDBG CDC
15 [SPI_SS_A]PA08SERCOM0 PAD[2] SPI SS32kHz Crystal footprint
16 [SPI_MOSI]PA06SERCOM0 PAD[0] SPI MOSIEDBG SPI
17 [SPI_MISO]PA09SERCOM0 PAD[3] SPI MISO32kHz Crystal footprint and EDBG SPI
18 [SPI_SCK]PA07SERCOM0 PAD[1] SPI SCKEDBG SPI
19 [GND]--GND
20 [VCC]--VCC