IO Expander MCP23017 I2C / SPI 16-Bit Module

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    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.


    • 16-bit remote bidirectional I/O port
    • I/O pins default to input
    • High-speed SPI interface (MCP23S17)
    • (a) 10 MHz (max.)
    • High-speed I2C™ interface (MCP23017) (a) 100 kHz (b) 400 kHz (c) 1.7 MHz
    • Three hardware address pins to allow up to eight devices on the bus
    • Configurable interrupt output pins (a) Configurable as active-high, active-low or open-drain
    • INTA and INTB can be configured to operate independently or together
    • Configurable interrupt source (a) Interrupt-on-change from configured register defaults or pin changes
    • Polarity Inversion register to configure the polarity of the input port data
    • External Reset input
    • Low standby current: 1 µA (max.)
    • Operating voltage: (a) 1.8V to 5.5V @ -40°C to +85°C (b) 2.7V to 5.5V @ -40°C to +85°C (c) 4.5V to 5.5V @ -40°C to +125°C

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