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Unique Features for the MCP23X08/17 GPIO Expanders

From Microchip Technology, Inc.

GPIO expanders provide easy I/O expansion using standard serial interfaces. GPIO products are used to increase the I/O on an MCU or provide remote I/O using a serial interface. This application note discusses the feature set and use of the MCP23X08/17 (8-bit and 16-bit) GPIO Expanders. The MCP23X08 are 8-bit GPIO Expanders: * MCP23008: I2C™ Interface * MCP23S08: SPI Interface The MCP23X17 are 16-bit GPIO Expanders: * MCP23017: I2C Interface * MCP23S17: SPI Interface The functions and features of the MCP23X08 and MCP23X17 are basically the same, except where otherwise noted.
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