3.1 Xplained Pro Standard Extension Header

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 their female counterparts. The following table provides the pin description of all the connected pins.
Info: Not all pins are 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 the Xplained Pro boards.

Table 3-1. Xplained Pro Standard Extension Header
Pin NumberPin NameDescription
1IDPin to communicate with the ID chip on an extension board.
2GNDGround
3ADC(+)Analog-to-Digital Converter; alternatively, a pin for the positive terminal of a differential ADC.
4ADC(-)Analog-to-Digital Converter; alternatively, a pin for the negative terminal of a differential ADC.
5GPIO1General purpose I/O pin.
6GPIO2General purpose I/O pin.
7PWM(+)Pulse width modulation; alternatively, a pin for the positive part of a differential PWM.
8PWM(-)Pulse width modulation; alternatively, a pin for the negative part of a differential PWM.
9IRQ/GPIOInterrupt request pin and/or general purpose I/O pin.
10SPI_SS_B/GPIOSlave select pin for Serial Peripheral Interface (SPI) and/or general purpose I/O pin.
11I2C_SDAData pin for I2C interface. Always connected, bus type.
12I2C_SCLClock pin for I2C interface. Always connected, bus type.
13UART_RXReceiver pin of target device UART.
14UART_TXTransmitter pin of target device UART.
15SPI_SS_ASlave select for SPI. This pin should preferably not be connected to anything else.
16SPI_MOSISPI master out slave in pin. Always connected, bus type.
17SPI_MISOSPI master in slave out pin. Always connected, bus type.
18SPI_SCKSPI clock pin. Always connected, bus type.
19GNDGround pin for extension boards.
20VCCPower pin for extension boards.