Xplained Pro Standard Extension Headers

The SAM L22 Xplained Pro headers EXT1, EXT2, and EXT3 offer 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 the table below. The headers have a pitch of 2.54mm.

Table 1. Extension Header EXT1
EXT1 pin SAM L22 pin Function Shared functionality
1 [ID] - - Communication line to the ID chip on an extension board
2 [GND] - - Ground
3 [ADC(+)] PA02 AIN[0] -
4 [ADC(-)] PA03 AIN[1] Shield
5 [GPIO1] PA20 GPIO (RTS) -
6 [GPIO2] PA21 GPIO (CTS) -
7 [PWM(+)] PB08 TC0/WO[0] -
8 [PWM(-)] PB09 TC0/WO[1] -
9 [IRQ/GPIO] PC02 IRQ10/GPIO -
10 [SPI_SS_B/GPIO] PC03 GPIO -
11 [TWI_SDA] PB30 SERCOM5 PAD[0] I²C SDA EXT2, EXT3, Shield, Crypto, and EDBG I²C
12 [TWI_SCL] PB31 SERCOM5 PAD[1] I²C SCL EXT2, EXT3, Shield, Crypto, and EDBG I²C
13 [USART_RX] PA23 SERCOM2 PAD[1] UART RX -
14 [USART_TX] PA22 SERCOM2 PAD[0] UART TX -
15 [SPI_SS_A] PB21 SERCOM3 PAD[1] SPI SS -
16 [SPI_MOSI] PB00 SERCOM3 PAD[2] SPI MOSI -
17 [SPI_MISO] PB02 SERCOM3 PAD[0] SPI MISO -
18 [SPI_SCK] PB01 SERCOM3 PAD[3] SPI SCK -
19 [GND] - - Ground
20 [VCC] - - Power for extension board
Table 2. Extension Header EXT2
EXT2 pin SAM L22 pin Function Shared functionality
1 [ID] - - Communication line to the ID chip on an extension board
2 [GND] - - Ground
3 [ADC(+)] PA04 AIN[4] Shield
4 [ADC(-)] PA05 AIN[5] Shield
5 [GPIO1] PB04 GPIO EDBG GPIO0, SLCD, and XAM
6 [GPIO2] PB05 GPIO EDBG GPIO1, SLCD, and XAM
7 [PWM(+)] PC28 TCC0/WO[4] SLCD
8 [PWM(-)] PA27 TCC0/WO[5] SLCD
9 [IRQ/GPIO] PC00 IRQ8/GPIO Shield and EDBG GPIO2
10 [SPI_SS_B/GPIO] PC01 GPIO Shield, User SW0, and EDBG GPIO3
11 [TWI_SDA] PB30 SERCOM5 PAD[0] I²C SDA EXT1, EXT3, Shield, Crypto, and EDBG I²C
12 [TWI_SCL] PB31 SERCOM5 PAD[1] I²C SCL EXT1, EXT3, Shield, Crypto, and EDBG I²C
13 [USART_RX] PA13 SERCOM3 PAD[1] UART RX -
14 [USART_TX] PA12 SERCOM3 PAD[0] UART TX -
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
Table 3. Extension Header EXT3
EXT3 pin SAM L22 pin Function Shared functionality
1 [ID] - - Communication line to the ID chip on an extension board
2 [GND] - - Ground
3 [ADC(+)] PA06 AIN[8] SLCD
4 [ADC(-)] PA07 AIN[9] SLCD
5 [GPIO1] PC16 GPIO SLCD
6 [GPIO2] PC17 GPIO SLCD
7 [PWM(+)] PB16 TC2/WO[0] SLCD
8 [PWM(-)] PB17 TC2/WO[1] SLCD
9 [IRQ/GPIO] PB18 IRQ2/GPIO SLCD
10 [SPI_SS_B/GPIO] PB19 GPIO SLCD
11 [TWI_SDA] PB30 SERCOM5 PAD[0] I²C SDA EXT1, EXT2, Shield, Crypto, and EDBG I²C
12 [TWI_SCL] PB31 SERCOM5 PAD[1] I²C SCL EXT1, EXT2, Shield, Crypto, and EDBG I²C
13 [USART_RX] PA15 SERCOM4 PAD[3] UART RX SLCD
14 [USART_TX] PA14 SERCOM4 PAD[2] UART TX SLCD
15 [SPI_SS_A] PA09 SERCOM0 PAD[1] SPI SS SLCD
16 [SPI_MOSI] PA10 SERCOM0 PAD[2] SPI MOSI SLCD
17 [SPI_MISO] PA08 SERCOM0 PAD[0] SPI MISO SLCD
18 [SPI_SCK] PA11 SERCOM0 PAD[3] SPI SCK SLCD
19 [GND] - - Ground
20 [VCC] - - Power for extension board
Parent topic: Connectors