The MCP23017/MCP23S17 (MCP23X17) device family provides 16-bit, general purpose parallel I/O expansion for I2C
bus or SPI applications. The two devices differ only in the serial interface.
        – MCP23017 – I2C interface
        – MCP23S17 – SPI interface
    The MCP23X17 consists of multiple 8-bit configuration registers for input, output and polarity selection. The system master
can enable the I/Os as either inputs or outputs by writing the I/O configuration bits (IODIRA/B). The data for each input or output
is kept in the corresponding input or output register. The polarity of the Input Port register can be inverted with the Polarity
Inversion register. All registers can be read by the system master.
   The 16-bit I/O port functionally consists of two 8-bit ports (PORTA and PORTB). The MCP23X17 can be configured to operate in
the 8-bit or 16-bit modes via IOCON.BANK. Type
Interface – I/O Expanders
Voltage – Supply
1.8 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Supplier Device Package