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.

Table 1. Xplained Pro Standard Extension Header
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