General-Purpose Input/Output

The Compute Blade allows for the uses of 11 of the Compute Module's GPIO pins. The GPIO allows for low speed modules and additional device control.

GPIO Locations and Functions

note

Functions are configurable and do not have to match the given functions.

warning

Using internal GPIO for unintended uses may lead to damage.

GPIO	Location	Functions
2	Expansion Module Port	I2C1 SDA
3	Expansion Module Port	I2C1 SLC
4	Expansion Module Port	GPCLK0
12	Fan Unit Connector	PWM0, UART5 TX
13	Fan Unit Connector	PWM1, UART5 RX
14	Expansion Module Port, UART Front(3pin), UART Back(4pin)	UART0 TX
15	Expansion Module Port, UART Front(3pin), UART Back(4pin)	UART0 RX
18	Internal	LEDs Control
20	Internal	Edge Button
21	Internal	LED Control
23	Internal	PoE+ Indicator

Pinout Guide

tip

View an interactive guide to the full Raspberry Pi GPIO pinout on Pinout.xyz

Expansion Module Port

The Expansion Module Port is pin 1 through pin 10 of the Raspberry Pi GPIO pinout. This makes the Expansion Module Port compatible with many existing products like Real Time Clock Modules or I2C Devices.

UART

There are two dedicated sets of pins for UART0. The V5 line on UART Back can operate as an Input or Output.

Warning

When no power source is connected to the compute blade the V5 pin can only be an input.

Fan Unit Connector

The square connector at the end of the Blade. The main purpose is to connect to a Fan Unit. It can be used to control any 5v PWM fan or as an additional UART port (UART5 on CM4)