Microchip MCP23S17-E/SO 16-Bit SPI I/O Expander, SOIC-28

The Microchip MCP23S17-E/SO is a 16-bit general purpose parallel I/O expander designed for SPI and I2C bus applications. This integrated circuit provides a flexible solution for expanding the I/O capabilities of your microcontroller, making it ideal for a wide range of embedded and communication systems.

Featuring a high-speed SPI interface (up to 10 MHz) and three hardware address pins, the MCP23S17-E/SO allows up to eight devices to be connected on the same bus, offering scalability for complex projects. The device includes multiple 8-bit configuration registers for input, output, and polarity selection, giving you full control over each I/O pin. Both 8-bit and 16-bit operating modes are supported via the IOCON.BANK register, adapting to your design requirements.

The expander offers configurable interrupt output pins (INTA and INTB), which can be set to active-high, active-low, or open-drain, and can operate independently or together. An interrupt-on-change feature allows you to monitor pin states or register defaults, reducing the need for continuous polling. A polarity inversion register is also included to easily reverse the logic of input port data.

Key Features

• 16-bit I/O port, functionally split into two 8-bit ports (PORTA and PORTB)
• High-speed I2C interface and SPI interface (up to 10 MHz)
• Three hardware address pins for up to eight devices per bus
• Configurable interrupt outputs: active high, active low, or open drain
• Interrupt source configurable for register defaults or pin changes
• Polarity inversion register for input port data
• Supply voltage range: 1.8V to 5.5V
• Industrial temperature range: -40°C to +125°C
• Package: SOIC-28

This component is suited for a variety of applications, including communications, networking, consumer electronics, embedded design development, and multimedia systems. Its robust feature set and industrial-grade 28