TCA9555 PCA9555 16-bit I/O Expander Module I2C GPIO Expansion Board

The TCA9555/PCA9555 module is a versatile 16-bit I/O expander designed to add more general-purpose input/output (GPIO) pins to your microcontroller projects. It communicates via the I2C (IIC) serial interface, requiring only two wires (SDA and SCL) plus power and ground, making it ideal for systems with limited available GPIOs.

• I/O Channels: 16 (P00-P07, P10-P17)
• Communication Protocol: I2C (IIC)
• Address Selection: Configurable I2C address via A0, A1, A2 pins (jumpers for A0 visible)
• Interrupt Output: nINT pin for interrupt generation
• Typical Applications: Expanding GPIOs for Arduino, Raspberry Pi, and other microcontrollers, controlling LEDs, reading buttons, interfacing with various sensors.