4.5.1 Xplained Pro Standard Extension Header
All Xplained Pro kits have one or more dual row, 20-pin, 100-mil extension
header. The Xplained Pro MCU boards have male headers, while the Xplained Pro extensions
have their female counterparts. All connected pins follow the defined pin description in
the table.
Info: All pins are not always connected on
all extension headers.
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 Xplained Pro MCU boards directly.
| 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 PWM |
| 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. This pin should preferably 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 |