MCP23017 IO Expander Serial Module I2C Serial Interface 16 bit

The MCP23017 IO Expander Serial Module is a powerful and flexible 16-bit GPIO expansion board that allows you to add up to 16 programmable digital input/output (GPIO) pins to your microcontroller using only the I2C serial interface. It is an ideal solution for projects where the available GPIO pins on a microcontroller are insufficient, enabling complex electronic systems without changing your main controller.

Based on the Microchip MCP23017 IC, this module communicates over the standard I2C bus, requiring only SDA and SCL connections while providing sixteen individually configurable GPIO pins organized into two 8-bit ports (Port A and Port B). Each pin can be independently configured as an input or output, with support for internal pull-up resistors, polarity inversion, and hardware interrupt generation for efficient event-driven applications.

The module features three hardware address pins (A0, A1, and A2), allowing up to eight MCP23017 modules to share the same I2C bus. This enables expansion of up to 128 digital I/O pins while using only two communication lines from your microcontroller, making it perfect for large-scale automation and embedded systems.

Supporting an operating voltage range of 1.8V to 5.5V, the MCP23017 is compatible with both 3.3V and 5V logic systems, making it suitable for a wide variety of development platforms, including Arduino, ESP32, ESP8266, Raspberry Pi, STM32, PIC, AVR, and other embedded controllers. The device also supports high-speed I2C communication up to 1.7 MHz, ensuring fast and reliable data transfer.

Its compact PCB design and simple wiring make it an excellent choice for expanding LEDs, push buttons, switches, relays, sensors, keypads, LCD interfaces, industrial control systems, home automation devices, robotics, and IoT applications. With extensive software library support and straightforward integration, the MCP23017 significantly simplifies hardware design while increasing system flexibility.