3.4.1 Xplained Pro Standard Extension Header
All Xplained Pro kits have one or more dual row, 20-pin, 100mil extension header. Xplained Pro MCU boards have male headers, while Xplained Pro extensions have their female counterparts. Note that all pins are not always connected. All connected pins follow the defined pin-out description in Table 3-4.
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 MCU on Xplained Pro MCU boards directly.
| Pin number | Name | Description |
|---|---|---|
| 1 | ID | Communication line to the ID chip on an extension board. |
| 2 | GND | Ground. |
| 3 | ADC(+) | Analog to digital converter, alternatively positive part of differential ADC. |
| 4 | ADC(-) | Analog to digital converter, alternatively negative part of differential ADC. |
| 5 | GPIO1 | General purpose I/O. |
| 6 | GPIO2 | General purpose I/O. |
| 7 | PWM(+) | Pulse width modulation, alternatively positive part of differential PWM. |
| 8 | PWM(-) | Pulse width modulation, alternatively negative part of differential PWM. |
| 9 | IRQ/GPIO | Interrupt request line and/or general purpose I/O. |
| 10 | SPI_SS_B/GPIO | Slave select for SPI and/or general purpose I/O. |
| 11 | I2C_SDA | Data line for I2C interface. Always implemented, bus type. |
| 12 | I2C_SCL | Clock line for I2C interface. Always implemented, bus type. |
| 13 | UART_RX | Receiver line of target device UART |
| 14 | UART_TX | Transmitter line of target device UART |
| 15 | SPI_SS_A | Slave select for SPI. Should preferably be unique. |
| 16 | SPI_MOSI | Master out slave in line of serial peripheral interface. Always implemented, bus type. |
| 17 | SPI_MISO | Master in slave out line of serial peripheral interface. Always implemented, bus type. |
| 18 | SPI_SCK | Clock for serial peripheral interface. Always implemented, bus type. |
| 19 | GND | Ground. |
| 20 | VCC | Power for extension board. |