The MCP23016 is not recommended for new designs. Please consider using theorinstead.

The MCP23016 device provides 16-bit, general purpose, parallel I/O expansion for I2C™Compatible bus applications.It includes high-current drive capability, low supply current and individual I/O configuration. I/O expanders provide a simple solution when additional I/Os are needed for ACPI, power switches, sensors, push buttons, LEDs and so on.

  16-bit I/O port expander with interrupt

  3 hardware address pins allow user to use up to 8 of these devices on the same I2C/SMBus

  25mA source/sink capability per I/O

  I2C and SMBus compatible interface (0 to 400kHz clock frequency)

   16 programmable bi-directional I/Os compatible with most processors

  Outputs can directly drive LEDs (Source and sink current 25mA)

  Polarity inversion register to configure the polarity of the input port data

  Internal power on reset (POR)

  Open-drain interrupt output activated when input changes state

  Low supply current

  Specified over Industrial temperature range -40°C to +85°C