3.2.1 Xplained Pro Standard Extension Header

All Xplained Pro evaluation kits have one or more dual row, 20-pin, 100mil extension headers. Xplained Pro boards have male headers while Xplained Pro extension boards have their female counterparts. Note that all pins are not always connected. However, all the connected pins follow the defined pin-out described in Table 3.2 Xplained Pro Extension Header . The extension headers can be used to connect a wide variety of Xplained Pro extensions to Xplained Pro boards and to access the pins of the target MCU on Xplained Pro board directly.

Table 3-2. Xplained Pro Extension Header
Pin numberNameDescription
1IDCommunication line to the ID chip on extension board
2GNDGround
3ADC(+)Analog to digital converter, alternatively positive part of differential ADC
4ADC(-)Analog to digital converter, alternatively negative part of differential ADC
5GPIO1General Purpose I/O
6GPIO2General Purpose I/O
7PWM(+)Pulse width modulation, alternatively positive part of differential PWM
8PWM(-)Pulse width modulation, alternatively negative part of differential PWM
9IRQ/GPIOInterrupt request line and/or general purpose I/O
10SPI_SS_B/GPIOSlave select for SPI and/or general purpose I/O
11TWI_SDAData line for two-wire interface. Always implemented, bus type.
12TWI_SCLClock line for two-wire interface. Always implemented, bus type.
13USART_RXReceiver line of Universal Synchronous and Asynchronous serial Receiver and Transmitter
14USART_TXTransmitter line of Universal Synchronous and Asynchronous serial Receiver and Transmitter
15SPI_SS_ASlave select for SPI. Should be unique if possible.
16SPI_MOSIMaster out slave in line of Serial peripheral interface. Always implemented, bus type.
17SPI_MISOMaster in slave out line of Serial peripheral interface. Always implemented, bus type.
18SPI_SCKClock for Serial peripheral interface. Always implemented, bus type.
19GNDGround
20VCCPower for extension board