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I/O Expanders are integrated circuits (ICs) that extend the input/output (I/O) capabilities of microcontrollers or other digital devices. They provide additional pins for connecting peripheral devices and expanding the functionality of the main controller. I/O expanders come in different configurations with varying numbers of input and output pins. They support communication protocols such as I2C, SPI, or GPIO, allowing seamless integration with microcontrollers and digital devices. Each expander has a unique address to differentiate it on the communication bus when multiple expanders are connected. The primary function of I/O expanders is to increase I/O flexibility. By using these ICs, designers can expand the number of available input and output pins, providing flexibility in connecting and controlling peripheral devices. This helps simplify the design of the main controller circuitry by offloading I/O functions to dedicated ICs. Using I/O expanders also offers space and cost savings. Lower pin count microcontrollers can be used while still supporting a larger number of peripherals, resulting in reduced space requirements and overall system costs. The integration of I/O expanders with microcontrollers is straightforward due to standard communication protocols. I/O expanders offer configurable I/O modes for each pin, allowing them to be used as inputs or outputs based on application requirements. This flexibility makes them suitable for various scenarios such as home automation, industrial automation, IoT, and robotics. In these applications, I/O expanders enable the control and monitoring of multiple devices, including sensors, actuators, motors, valves, and more. In summary, Interface - I/O Expanders are ICs that expand the I/O capabilities of microcontrollers and digital devices. They provide additional pins, increase flexibility, simplify design, save space and costs, and offer configurable I/O modes. I/O expanders find applications in diverse fields, enabling the connection and control of various peripheral devices to enhance the functionality and versatility of systems.