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 https://elecena.pl/product/22721795/mcp23017-io-expansion-board 2023-03-07 https://elecena.pl/product/22721795/mcp23017-io-expansion-board 2023-12-27 https://elecena.pl/product/22721795/mcp23017-io-expansion-board 2024-09-19 https://elecena.pl/product/22721795/mcp23017-io-expansion-board 2024-11-29 https://elecena.pl/product/22721795/mcp23017-io-expansion-board 2024-11-30 https://elecena.pl/product/22721795/mcp23017-io-expansion-board 2025-08-05 https://elecena.pl/product/22721795/mcp23017-io-expansion-board 2025-11-28 https://elecena.pl/product/22721795/mcp23017-io-expansion-board 2025-11-29