Microchip MCP23S17 SPI Port Expander 5 volts

The MCP23S17 device family provides 16-bit, general purpose parallel I/O expansion for SPI applications.

The 16-bit I/O port functionally consists of two 8-bit ports (PORTA and PORTB).

Features

• 16-bit input/output port expander with interrupt output
• Cascadable for up to 8 devices on one bus
• 25mA sink/source capability per I/O
• Three hardware address pins to allow up to eight devices on the bus
• High-speed SPI interface (MCP23S17)

Documentation

MCP23017/MCP23S17 Data Sheet

If you would like to convert your I2C LCD Interface into a SPI version, remove the included MCP23017 and replace it with the MCP23S17.

For more information about using the LCD Interface as an SPI version, check here I2C / SPI LCD Interface info.

The MCP23S17 is used also used in the Project 64 button board.