The SAM D20 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 all comply with the standard extension header specified inTable 1. All headers have a pitch of 2.54mm.
Pin on EXT1 | SAM D20 pin | Function | Shared functionality |
---|---|---|---|
1 | - | - | Communication line to ID chip on extension board. |
2 | - | - | GND |
3 | PB00 | AIN[8] | |
4 | PB01 | AIN[9] | |
5 | PB06 | GPIO | |
6 | PB07 | GPIO | |
7 | PB02 | TC6/WO[0] | |
8 | PB03 | TC6/WO[1] | |
9 | PB04 | EXTINT[4] | |
10 | PB05 | GPIO | |
11 | PA08 | SERCOM2 PAD[0] I²C SDA | EXT2, EXT3, and EDBG |
12 | PA09 | SERCOM2 PAD[1] I²C SCL | EXT2, EXT3, and EDBG |
13 | PB09 | SERCOM4 PAD[1] UART RX(1) | |
14 | PB08 | SERCOM4 PAD[0] UART TX(1) | |
15 | PA05 | SERCOM0 PAD[1] SPI SS | |
16 | PA06 | SERCOM0 PAD[2] SPI MOSI | |
17 | PA04 | SERCOM0 PAD[0] SPI MISO | |
18 | PA07 | SERCOM0 PAD[3] SPI SCK | |
19 | - | - | GND |
20 | - | - | VCC |
Pin on EXT2 | SAM D20 pin | Function | Shared functionality |
---|---|---|---|
1 | - | - | Communication line to ID chip on extension board. |
2 | - | - | GND |
3 | PA10 | AIN[18] | |
4 | PA11 | AIN[19] | |
5 | PA20 | GPIO | |
6 | PA21 | GPIO | |
7 | PA22 | TC4/WO[0] | |
8 | PA23 | TC4/WO[1] | |
9 | PB14 | EXTINT[14] | |
10 | PB15 | GPIO | |
11 | PA08 | SERCOM2 PAD[0] I²C SDA | EXT1, EXT3, and EDBG |
12 | PA09 | SERCOM2 PAD[1] I²C SCL | EXT1, EXT3, and EDBG |
13 | PB13 | SERCOM4 PAD[1] UART RX(1) | |
14 | PB12 | SERCOM4 PAD[0] UART TX(1) | |
15 | PA17 | SERCOM1 PAD[1] SPI SS | |
16 | PA18 | SERCOM1 PAD[2] SPI MOSI | |
17 | PA16 | SERCOM1 PAD[0] SPI MISO | |
18 | PA19 | SERCOM1 PAD[3] SPI SCK | |
19 | - | - | GND |
20 | - | - | VCC |
Pin on EXT3 | SAM D20 pin | Function | Shared functionality |
---|---|---|---|
1 | - | - | Communication line to ID chip on extension board. |
2 | - | - | GND |
3 | PA02 | AIN[0] | |
4 | PA03 | AIN[1] | |
5 | PB30 | GPIO | |
6 | PA15 | GPIO | Onboard SW0 |
7 | PA12 | TC2/WO[0] | |
8 | PA13 | TC2/WO[1] | |
9 | PA28 | EXTINT[8] | |
10 | PA27 | GPIO | |
11 | PA08 | SERCOM2 PAD[0] I²C SDA | EXT1, EXT2, and EDBG |
12 | PA09 | SERCOM2 PAD[1] I²C SCL | EXT1, EXT2, and EDBG |
13 | PB11 | SERCOM4 PAD[3] UART RX(1) | |
14 | PB10 | SERCOM4 PAD[2] UART TX(1) | |
15 | PB17 | SERCOM5 PAD[1] SPI SS | |
16 | PB22 | SERCOM5 PAD[2] SPI MOSI | EDBG |
17 | PB16 | SERCOM5 PAD[0] SPI MISO | EDBG |
18 | PB23 | SERCOM5 PAD[3] SPI SCK | EDBG |
19 | - | - | GND |
20 | - | - | VCC |