All Xplained Pro kits have many dual row, 20-pin, 100-mil extension headers. The Xplained Pro MCU boards have male headers, while the Xplained Pro extensions have female counterparts. The following table provides the pin description of all the connected pins.
The extension headers can be used to connect a variety of Xplained Pro extensions to Xplained Pro MCU boards or to access the pins of the target microcontroller on the Xplained Pro boards.
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | ID | Pin to communicate with the ID chip on an extension board |
| 2 | GND | Ground |
| 3 | ADC(+) | Analog-to-Digital Converter; alternatively, a pin for the positive terminal of a differential ADC |
| 4 | ADC(-) | Analog-to-Digital Converter; alternatively, a pin for the negative terminal of a differential ADC |
| 5 | GPIO1 | General purpose I/O pin |
| 6 | GPIO2 | General purpose I/O pin |
| 7 | PWM(+) | Pulse-Width Modulation; alternatively, a pin for the positive part of a differential PWN |
| 8 | PWM(-) | Pulse-Width Modulation; alternatively, a pin for the negative part of a differential PWM |
| 9 | IRQ/GPIO | Interrupt request pin and/or general purpose I/O pin |
| 10 | SPI_SS_B/ GPIO | Slave select pin for Serial Peripheral Interface (SPI) and/or general purpose I/O pin |
| 11 | I2C _SDA | Data pin for I2C interface. Always connected, bus type |
| 12 | I2C _SCL | Clock pin for I2C interface. Always connected, bus type |
| 13 | UART_RX | Receiver pin of target device UART |
| 14 | UART_TX | Transmitter pin of target device UART |
| 15 | SPI_SS_A | Slave select for SPI. Preferably, this pin should not be connected to anything else |
| 16 | SPI_MOSI | SPI master out, slave in pin. Always connected, bus type |
| 17 | SPI_MISO | SPI master in, slave out pin. Always connected, bus type |
| 18 | SPI_SCK | SPI clock pin. Always connected, bus type |
| 19 | GND | Ground pin for extension boards |
| 20 | VCC | Power pin for extension boards |