Overview
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 Board can be used at the same time, providing up to 128 I/O pins, it is compatible with both 3.3V and 5V levels.

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

Specifications
1. Operating voltage: 5V/3.3V
2. Interface: I2C
3. Interrupt pins: INTA, INTB
4. Expansion I/Os: 16
5. Dimension: 38mm × 23mm
6. Mounting hole size: 2.0mm