PCA9555DB,118

Overview

The PCA9555DB,118 is a 16-bit I/O expander designed for I2C-bus or SMBus applications, providing a remote GPIO solution for microcontrollers with limited pins. It features a polarity inversion register, an active-LOW interrupt output to notify the host of input state changes, and internal power-on reset for predictable startup. Operating from 2.3V to 5.5V, it allows for easy interfacing with different logic levels and includes noise filters on the SCL and SDA inputs.

Why Choose This Part

This device offers very low standby current of 250uA and a small SSOP24 footprint, making it ideal for power-sensitive and space-constrained designs. It includes internal pull-up resistors on the I/O pins to simplify the bill of materials and supports Fast-mode I2C up to 400kHz.

Applications

Getting Started

To integrate the PCA9555DB,118, connect the SCL and SDA lines to your host microcontroller's I2C peripheral with appropriate pull-up resistors. Ensure the three hardware address pins (A0, A1, A2) are tied to VDD or GND to set the specific I2C slave address. In your firmware, initialize the Configuration registers to define each pin as an input or output before performing read or write operations.

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