The Xplained Pro extension headers EXT1, EXT2, and EXT3 offer access to the
I/O of the microcontroller to expand the board, for example, by connecting extensions to
the board. These headers are based on the standard Xplained Pro extension header
specification and the connections are shown in the table below. The headers have a pitch
of 2.54 mm.
Table 5-1. Extension Header EXT1| EXT1 pin | SAM E54 pin | Function | Shared functionality |
|---|
| 1 [ID] | - | - | Communication line to the ID chip on an extension
board |
| 2 [GND] | - | - | Ground |
| 3 [ADC(+)] | PB04 | ADC1/AIN[6] | - |
| 4 [ADC(-)] | PB05 | ADC1/AIN[7] | - |
| 5 [GPIO1] | PA06 | GPIO (RTS) | - |
| 6 [GPIO2] | PA07 | GPIO (CTS) | - |
| 7 [PWM(+)] | PB08 | TC4/WO[0] | - |
| 8 [PWM(-)] | PB09 | TC4/WO[1] | - |
| 9 [IRQ/GPIO] | PB07 | IRQ7/GPIO | - |
| 10 [SPI_SS_B/GPIO] | PA27 | GPIO | - |
| 11 [TWI_SDA] | PA22 | SERCOM3 PAD[0] I²C SDA | PCC |
| 12 [TWI_SCL] | PA23 | SERCOM3 PAD[1] I²C SCL | PCC |
| 13 [USART_RX] | PA05 | SERCOM0 PAD[1] UART RX | - |
| 14 [USART_TX] | PA04 | SERCOM0 PAD[0] UART TX | - |
| 15 [SPI_SS_A] | PB28 | SERCOM4 PAD[2] SPI SS | - |
| 16 [SPI_MOSI] | PB27 | SERCOM4 PAD[0] SPI MOSI | - |
| 17 [SPI_MISO] | PB29 | SERCOM4 PAD[3] SPI MISO | - |
| 18 [SPI_SCK] | PB26 | SERCOM4 PAD[1] SPI SCK | - |
| 19 [GND] | - | - | Ground |
| 20 [VCC] | - | - | Power for extension board |
Table 5-2. Extension Header EXT2| EXT2 pin | SAM E54 pin | Function | Shared functionality |
|---|
| 1 [ID] | - | - | Communication line to the ID chip on an extension
board |
| 2 [GND] | - | - | Ground |
| 3 [ADC(+)] | PB00 | ADC0/AIN[12] | - |
| 4 [ADC(-)] | PA03 | ADC0/AIN[1] | - |
| 5 [GPIO1] | PB01 | GPIO | - |
| 6 [GPIO2] | PB06 | GPIO | - |
| 7 [PWM(+)] | PB14 | TCC4/WO[4] | PCC |
| 8 [PWM(-)] | PB15 | TCC4/WO[5] | PCC |
| 9 [IRQ/GPIO] | PD00 | IRQ0/GPIO | - |
| 10 [SPI_SS_B/GPIO] | PB02 | GPIO | - |
| 11 [TWI_SDA] | PD08 | SERCOM7 PAD[0] I²C SDA | AT24MAC402, ATECC508, PCC, EXT3, and EDBG DGI |
| 12 [TWI_SCL] | PD09 | SERCOM7 PAD[1] I²C SCL | AT24MAC402, ATECC508, PCC, EXT3, and EDBG DGI |
| 13 [USART_RX] | PB17 | SERCOM5 PAD[1] UART RX | - |
| 14 [USART_TX] | PB16 | SERCOM5 PAD[0] UART TX | - |
| 15 [SPI_SS_A] | PC06 | SERCOM6 PAD[2] SPI SS | - |
| 16 [SPI_MOSI] | PC04 | SERCOM6 PAD[0] SPI MOSI | EXT3 and EDBG DGI |
| 17 [SPI_MISO] | PC07 | SERCOM6 PAD[3] SPI MISO | EXT3 and EDBG DGI |
| 18 [SPI_SCK] | PC05 | SERCOM6 PAD[1] SPI SCK | EXT3 and EDBG DGI |
| 19 [GND] | - | - | Ground |
| 20 [VCC] | - | - | Power for extension board |
Table 5-3. Extension Header EXT3| EXT3 pin | SAM E54 pin | Function | Shared functionality |
|---|
| 1 [ID] | - | - | Communication line to the ID chip on an extension
board |
| 2 [GND] | - | - | Ground |
| 3 [ADC(+)] | PC02 | ADC1/AIN[4] | |
| 4 [ADC(-)] | PC03 | ADC1/AIN[5] | |
| 5 [GPIO1] | PC01 | GPIO | |
| 6 [GPIO2] | PC10 | GPIO | - |
| 7 [PWM(+)] | PD10 | TCC0/WO[3] | - |
| 8 [PWM(-)] | PD11 | TCC0/WO[4] | - |
| 9 [IRQ/GPIO] | PC30 | IRQ14/GPIO | - |
| 10 [SPI_SS_B/GPIO] | PC31 | GPIO | - |
| 11 [TWI_SDA] | PD08 | SERCOM7 PAD[0] I²C SDA | AT24MAC402, ATECC508, PCC, EXT2, and EDBG DGI |
| 12 [TWI_SCL] | PD09 | SERCOM7 PAD[1] I²C SCL | AT24MAC402, ATECC508, PCC, EXT2, and EDBG DGI |
| 13 [USART_RX] | PC23 | SERCOM1 PAD[1] UART RX | - |
| 14 [USART_TX] | PC22 | SERCOM1 PAD[0] UART TX | - |
| 15 [SPI_SS_A] | PC14 | GPIO | - |
| 16 [SPI_MOSI] | PC04 | SERCOM6 PAD[0] SPI MOSI | EXT2 and EDBG DGI |
| 17 [SPI_MISO] | PC07 | SERCOM6 PAD[3] SPI MISO | EXT2 and EDBG DGI |
| 18 [SPI_SCK] | PC05 | SERCOM6 PAD[1] SPI SCK | EXT2 and EDBG DGI |
| 19 [GND] | - | - | Ground |
| 20 [VCC] | - | - | Power for extension board |
