PCAL9555AHF,128

Overview

The PCAL9555AHF is a 16-bit I2C-bus/SMBus I/O expander designed for low-voltage applications with an integrated Agile I/O feature set. It provides a remote I/O expansion solution for microcontrollers via the I2C-bus, featuring programmable output drive strength, latchable inputs, and configurable pull-up or pull-down resistors.

Why Choose This Part

This device features Agile I/O which allows for advanced configuration such as interrupt masking, output port configuration, and programmable pull-up/down resistors (100 kOhm). It is software backward compatible with the industry-standard PCA9555 but adds significant robustness with ESD protection exceeding 2000V HBM and a glitch-free power-up sequence.

Applications

Getting Started

To evaluate this part, interface the HWQFN24 package with any I2C-capable microcontroller like an LPC or STM32. Ensure the ADDR pins are tied to VDD or GND to set the fixed I2C address, and use a pull-up resistor on the open-drain INT pin for interrupt-driven logic.

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