Xplained Pro Standard Extension Headers

The SAM G55 Xplained Pro headers EXT1, EXT3, and EXT4 offer access to the I/O of the microcontroller in order to expand the board by connecting extensions to the board. All these headers comply with the Xplained Pro standard extension header specification. The headers have a pitch of 2.54mm.

Table 1. Extension Header EXT1
Pin on EXT1 SAM G55 pin SAM G55 Peripheral Function Shared Functionality
1 [ID] - - Communication line to ID chip on extension board.
2 [GND] - - GND
3 [ADC(+)] PA17 AD0  
4 [ADC(-)] PA18 AD1  
5 [GPIO1] PA26 GPIO UART0 RTS
6 [GPIO2] PA25 GPIO UART0 CTS
7 [PWM(+)] PA00 TIOA0  
8 [PWM(-)] PA23 TIOA1  
9 [IRQ/GPIO] PA24 WKUP11  
10 [SPI_SS_B/GPIO] PA29 GPIO  
11 [TWI_SDA] PB10 TWD4  
12 [TWI_SCL] PB11 TWCK4  
13 [USART_RX] PA09 USART RXD (URXD0)  
14 [USART_TX] PA10 USART TXD (UTXD0)  
15 [SPI_SS_A] PA11 SPI NPCS0  
16 [SPI_MOSI] PA13 SPI MOSI EXT3 connector
17 [SPI_MISO] PA12 SPI MISO EXT3 connector
18 [SPI_SCK] PA14 SPI SCK EXT3 connector
19 [GND] - - GND
20 [VCC] - - VCC
Table 2. Extension Header EXT3
Pin on EXT3 SAM G55 pin SAM G55 Shared Functionality Shared Functionality
1 [ID] - - Communication line to ID chip on extension board.
2 [GND] - - GND
3 [ADC(+)] PA19 AD2  
4 [ADC(-)] PA20 AD3  
5 [GPIO1] PA30 GPIO  
6 [GPIO2] PB15 GPIO  
7 [PWM(+)] PA01 TIOB0  
8 [PWM(-)] PB13 GPIO  
9 [IRQ/GPIO] PB03 WKUP13  
10 [SPI_SS_B/GPIO] PA15 GPIO  
11 [TWI_SDA] PB08 TWD4  
12 [TWI_SCL] PB09 TWCK4  
13 [USART_RX] PB01 USART6 RXD EDBG (DGI USART)
14 [USART_TX] PB00 USART0 TXD EDBG (DGI USART)
15 [SPI_SS_A] PA05 SPI NPCS1  
16 [SPI_MOSI] PA13 SPI MOSI EXT1 connector (SPI MOSI)
17 [SPI_MISO] PA12 SPI MISO EXT1 connector (SPI MISO)
18 [SPI_SCK] PA14 SPI SCK EXT1 connector (SPI SCK)
19 [GND] - - GND
20 [VCC] - - VCC
Table 3. Extension Header EXT4
Pin on EXT4 SAM G55 pin SAM G55 Peripheral Function Shared Functionality
1 [ID] - - Communication line to ID chip on extension board.
2 [GND] - - GND
3 [ADC(+)] - -  
4 [ADC(-)] - -  
5 [GPIO1] PA31 GPIO PCK2
6 [GPIO2] - -  
7 [PWM(+)] - -  
8 [PWM(-)] - -  
9 [IRQ/GPIO] PB14 -  
10 [SPI_SS_B/GPIO] - -  
11 [TWI_SDA] PB10 TWD4 EDBG and EXT1 connector (TWI)
12 [TWI_SCL] PB11 TWCK1 EDBG and EXT1 connector (TWI)
13 [USART_RX] - -  
14 [USART_TX] - -  
15 [SPI_SS_A] - -  
16 [SPI_MOSI] - -  
17 [SPI_MISO] - -  
18 [SPI_SCK] - -  
19 [GND] - - GND
20 [VCC] - - VCC
Parent topic: Connectors