The MCP23017T-E/SS is a versatile, 16-bit I/O expander from Microchip Technology designed for use with I²C interface. Housed in a space-saving SSOP-28 package, this device extends the capabilities of microcontrollers by providing additional GPIO ports, making it ideal for applications requiring more I/O pins than are available on the primary controller. It supports both 1.8V to 5.5V operation on VCC and can communicate over an I²C bus at speeds up to 1.7 MHz.

Key Features

This I/O expander includes two 8-bit configurable ports (PORTA and PORTB), each capable of being set as inputs or outputs independently. The MCP23017T-E/SS features internal pull-up resistors on all input pins, simplifying circuit design by reducing the need for external components. It also offers interrupt output functionality with the ability to detect changes on any port pin, enabling efficient event-driven programming. Additionally, its wide operating voltage range and low standby current consumption make it suitable for battery-operated devices.

Applications

Ideal for home automation systems, industrial control panels, and portable electronics, the MCP23017T-E/SS facilitates easy expansion of I/O capabilities in complex systems. Its compatibility with a broad range of microcontrollers makes it useful in sensor networks, where multiple sensors and actuators need to be managed simultaneously. Furthermore, its robust communication protocol supports reliable data exchange in multi-device setups such as smart lighting systems and IoT devices.

Summary

The MCP23017T-E/SS stands out for its flexibility, ease of integration, and capability to expand system I/O capacity significantly. With features like programmable pull-ups, interrupt detection, and support for high-speed I²C communication, it provides a comprehensive solution for enhancing microcontroller-based designs. Its compact packaging and wide operational voltage range ensure that it can meet the needs of various applications, from consumer electronics to industrial automation, offering designers a powerful tool for expanding their system's connectivity options.