MCP23017 I/O Expander Module (I2C)

About this product

16-bit I/O expander module communicating over I2C, adding 16 additional GPIO pins to any microcontroller with only two data lines. Up to 8 modules cascade on one I2C bus for 128 total pins. Useful for keypad matrices, LED arrays, and projects that have run out of native GPIO.

Ultrasonic, IR, temperature, humidity, motion, current, camera and RF sensor modules - plus relay, logic-level and breakout boards for prototyping and production.

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Specifications

Chip

MCP23017

I/O Pins

16 (expandable to 128 with 8 cascaded modules)

Interface

I2C

I2C Address Range

0x20-0x27 (set via A0-A2 pins)

Operating Voltage

3.3V-5V

Drive Current

20-25mA per pin

Application

GPIO expansion, keypad/LED matrices