4.2 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 to 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 4-2. 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	Client 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	Client select for SPI. This pin should preferably not be connected to anything else.
16	SPI_MOSI	SPI Host Out, Client In pin. Always connected, bus type.
17	SPI_MISO	SPI Host In, Client 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.

Table 4-3. WINC1500-XPRO Extension Header
Pin Number	Pin Name	Description
1	ID_DATA	Communication line to ID chip
2	GND	Ground
3	NC	—
4	NC	—
5	RESET_N	Active-low hard reset to the board
6	WAKE	Active-high host wake control signal to the wireless module
7	NC	—
8	NC	—
9	IRQN	Interrupt output from the wireless module to the host
10	CHIP_EN	Active-high module enable signal to wireless module from host
11	I²C_SDA	Data line for I²C interface
12	I²C_SCL	Clock line for I²C interface
13	UART_RX	Receive pin of target MCU UART interface
14	UART_TX	Transmit pin of target MCU UART interface
15	SPI_SSN	Active-low client select signal of the SPI interface to wireless module from host
16	SPI_MOSI	Host Out, Client In signal of target MCU SPI interface
17	SPI_MISO	Host In, Client Out signal of target MCU SPI interface
18	SPI_SCK	Clock line of the SPI interface
19	GND	Ground
20	VCC_TARGET	Target +3.3V supply voltage from the host MCU board

Table 4-4. I/O1 Xplained Pro Extension Header
Pin Number	Pin Name	Description
1	ID	Communication line to ID chip
2	GND	Ground
3	LIGHTSENSOR	Light sensor output (ADC)
4	LP_OUT	Low-pass filter output (ADC)
5	GPIO1	General-Purpose I/O pin (GPIO)
6	GPIO2	General -Purpose I/O pin (GPIO)
7	LED LED	Control (PWM)
8	LP_IN	Low-pass filter input (PWM)
9	TEMP_ALERT ALERT	Pin 3 of temperature sensor chip (IRQ)
10	microSD_DETECT	Detect pin on microSD card connector (GPIO)
11	TWI SDA	Data line of TWI interface, connected to SDA pin (pin 1) of temperature sensor chip
12	TWI SCL	Clock line of TWI interface, connected to SCL pin (pin 2) of temperature sensor chip
13	UART RX	Receive pin of target MCU UART interface
14	UART TX	Transmit pin of target MCU UART interface
15	microSD_SS	Chip select signal, connected to DAT3 pin on microSD card connector
16	SPI_MOSI	Host Out, Client In signal of target MCU SPI interface. Connected to CMD pin on microSD card connector.
17	SPI_MISO	Host In, Client Out signal of target MCU SPI interface. Connected to D0 pin on microSD card connector.
18	SPI_SCK	Clock line of SPI interface. Connected to CLK pin on microSD card connector.
19	GND	Ground
20	VCC	Target supply voltage