MCP23017 IO Expansion Board

The MCP23017 IO Expansion Board expands 2 signal pins as 16 I/O pins based on the I2C bus.

Up to 8 MCP23017 IO Expansion Boards can be used at the same time by selecting different addresses for each module, providing up to 128 I/O pins!

This module is compatible with both 3.3V and 5V levels. Examples are provided for Raspberry Pi, micro:bit, Arduino and more!

Features

• I2C controlled, expands 2 signal pins as 16 I/O pins
• I2C address configurable by shorting the A0/A1/A2 jumpers
• Provides two connector options: PH2.0 terminal and/or solder pads, allows multi I2C modules to be stacked
• Onboard voltage translator, compatible with 3.3V/5V level
• Online development resources and manual (examples for Raspberry Pi / micro:bit / Arduino / STM32)

Specifications

• Operating voltage: 5V/3.3V
• Interface: I2C
• Interrupt pins: INTA, INTB
• Expansion I/Os: 16
• Dimension: 38mm × 23mm
• Mounting hole size: 2.0mm

Resources

• Product Wiki

Interface Definition

PIN	I2C
VCC	Power supply, 3.3V/5V
GND	Ground
SDA	I2C data line
SCL	I2C clock line
INTA	PA group interrupt output
INTB	PB group interrupt output

Package Contents

• 1x MCP23017 IO Expansion Board
• 1x PH2.0 20cm 6-pin cable