Xplained Pro Standard Extension Headers

The SAM4N Xplained Pro headers EXT1, EXT2, and EXT3 offers 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 Xplained Pro standard extension header. All headers have a pitch of 2.54mm.

Table 1. Extension Header EXT1
Pin on EXT1 SAM4N pin Function Shared functionality
1 - - Communication line to ID chip on extension board
2 - - GND
3 PA17 AD0  
4 PA18 AD1  
5 PA24 GPIO  
6 PA25 GPIO SPARE HEADER2
7 PC23 TIOA3 SPARE HEADER2
8 PC24 TIOB3 SPARE HEADER2
9 PA0 WKUP0  
10 PA23 GPIO  
11 PA3 TWD0 EXT3
12 PA4 TWCK0 EXT3, SPARE HEADER1
13 PA21 RXD1  
14 PA22 TXD1  
15 PA11 NPCS0  
16 PA13 SPI_MOSI EXT2, EXT3
17 PA12 SPI_MISO EXT2, EXT3
18 PA14 SPI_SCK EXT2, EXT3
19 - - GND
20 - - VCC
Table 2. Extension Header EXT2
Pin on EXT2 SAM4N pin Function Shared functionality
1 - - Communication line to ID chip on extension board
2 - - GND
3 PA19 AD2  
4 PA20 AD3  
5 PC0 GPIO  
6 PC1 GPIO  
7 PC26 TIOA4  
8 PC27 TIOB4  
9 PA1 WKUP1  
10 PC8 GPIO  
11 PB0 TWD2 EDBG
12 PB1 TWCK2 EDBG
13 PA5 RXD0  
14 PA6 TXD0  
15 PC4 NPCS1  
16 PA13 SPI_MOSI EXT1, EXT3
17 PA12 SPI_MISO EXT1, EXT3
18 PA14 SPI_SCK EXT1, EXT3
19 - - GND
20 - - VCC
Table 3. Extension Header EXT3
Pin on EXT3 SAM4N pin Function Shared functionality
1 - - Communication line to ID chip on extension board
2 - - GND
3 PC29 AD13  
4 PC30 AD14  
5 PC2 GPIO  
6 PC3 GPIO  
7 PA26 TIOA2  
8 PA27 TIOB2  
9 PB2 WKUP12  
10 PB3 GPIO  
11 PA3 TWD0 EXT1
12 PA4 TWCK0 EXT1, SPARE HEADER1
13 PB10 URXD3  
14 PB11 UTXD3  
15 PC7 NPCS2  
16 PA13 SPI_MOSI EXT1, EXT2
17 PA12 SPI_MISO EXT1, EXT2
18 PA14 SPI_SCK EXT1, EXT2
19 - - GND
20 - - VCC
Parent topic: Connectors