OLED1 Xplained Pro implements one Xplained Pro standard extension header marked with EXT in silkscreen. This header makes it possible to connect the board to any Xplained Pro MCU board. The pin-out definition for the extension header can be seen in the table below.
| Pin Number | Function | Description |
|---|---|---|
| 1 | ID | Communication line to ID chip |
| 2 | GND | Ground |
| 3 | BUTTON2 | Push button 2, active low |
| 4 | BUTTON3 | Push button 3, active low |
| 5 | DATA_CMD_SEL | Data / command select for OLED display. High = data, low = command. |
| 6 | LED3 | LED3, active low |
| 7 | LED1 | LED1, active low |
| 8 | LED2 | LED2, active low |
| 9 | BUTTON1 | Push button 1, active low |
| 10 | DISPLAY_RESET | Reset line for OLED display, active low |
| 11 | NC | |
| 12 | NC | |
| 13 | NC | |
| 14 | NC | |
| 15 | DISPLAY_SS | OLED display slave select, active low |
| 16 | SPI MOSI | MOSI signal SPI connected to OLED display |
| 17 | NC | |
| 18 | SPI SCK | Clock signal for SPI connected to OLED display |
| 19 | GND | Ground |
| 20 | VCC | Target supply voltage |