Description
The 7Semi MCP23017 breakout board is designed to expand the digital I/O capabilities of microcontrollers and SBCs using I2C communication. It offers 16 additional bidirectional GPIO pins through a simple 2-wire I2C interface. It is ideal for applications that require more I/O lines than what the host device provides.
Technical Specification:
- IC: MCP23017
- Interface: I2C (standard and fast mode up to 1.7 MHz)
- Operating Voltage: 1.8V to 5.5V
- GPIO Count: 16 (2 ports of 8 bits each)
- Addressable Devices: Up to 8 on one I2C bus using 3 address pins
- Interrupts: Dual interrupt outputs (INTA, INTB)
- Current Consumption (Standby): ~1 µA max
- Logic Compatibility: 3.3V and 5V systems
- Package: Breakout board with header pins
- Operating Temperature: –40°C to +85°C (typical)
Features:
- Adds 16 GPIOs to any microcontroller using only 2 I2C lines
- All GPIOs are individually programmable as input or output
- Supports optional pull-up resistors and polarity inversion
- Interrupt-on-change feature for efficient signal monitoring
- Compatible with wide supply voltages
- Compact breakout board ideal for prototyping
- Supports multiple boards on a single I2C bus
- Low power consumption suitable for battery-powered systems
Applications:
- GPIO expansion for microcontrollers (Arduino, ESP32, STM32, etc.)
- I/O extension for Raspberry Pi and other single-board computers
- Button matrix reading and keypad interfaces
- LED control, display row/column driving
- Industrial monitoring and automation
- Robotics and hobby electronics projects
- Low-power embedded systems needing extra digital lines