PCA9555D,112
Overview
The PCA9555D is a 16-bit I/O expander for I2C-bus and SMBus applications designed for 2.3V to 5.5V VDD operation. It provides a simple solution when additional I/O is needed for ACPI power switches, sensors, push-buttons, or LEDs, and includes an interrupt output to notify the system of input state changes.
Why Choose This Part
This device features a Polarity Inversion register that allows software-based inversion of input data. It offers high-drive capability with up to 50mA total I/O sink current and includes internal power-on reset to ensure all pins default to inputs upon startup.
Applications
Key Specifications
Getting Started
To use the PCA9555D, connect the SCL and SDA lines to your I2C host with appropriate pull-up resistors and set the three hardware address pins (A0, A1, A2) to define the bus address. Use standard I2C write commands to configure the registers for input, output, or polarity inversion. For rapid prototyping, look for PCA9555 breakout boards compatible with Arduino or Raspberry Pi environments.
