MCP23017 I_O Expander

The Microchip MCP23017 is a versatile 16-bit I/O expander that provides remote bidirectional I/O expansion for microcontrollers via a standard I2C interface. It allows you to add 16 additional digital input/output pins using only two I2C pins (SDA and SCL), making it perfect for projects requiring more GPIOs than the host microcontroller offers. The device features a fully programmable address set by three hardware address pins, allowing up to eight devices on the same bus. It supports an operating voltage range of 1.8V to 5.5V, making it compatible with both 3.3V and 5V logic systems. Key features include individual I/O direction control, internal pull-up resistors, and interrupt output capabilities for event-driven applications. Common applications include LED control, button matrix scanning, relay driving, and general-purpose digital I/O expansion in embedded systems, robotics, and industrial control. Choose the MCP23017 for reliable, low-power I/O expansion backed by Microchip's reputation for quality.