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 the table below.

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.

Table 3-4. Xplained Pro Standard Extension Header
Pin numberNameDescription
1IDCommunication line to the ID chip on an 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
11I2C_SDAData line for I2C interface. Always implemented, bus type.
12I2C_SCLClock line for I2C interface. Always implemented, bus type.
13UART_RXReceiver line of target device UART
14UART_TXTransmitter line of target device UART
15SPI_SS_ASlave select for SPI. Should preferably be unique.
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