TITCA9555RGER

Overview

The TCA9555RGER is a 16-bit I/O expander designed for I2C bus or SMBus applications, providing a remote I/O solution for microcontrollers. It operates across a wide voltage range of 1.65V to 5.5V and features an interrupt output to notify the host of input state changes. This device is particularly useful when the primary processor lacks sufficient GPIO pins to manage system peripherals.

Why Choose This Part

The device offers individual port configuration, allowing each of the 16 pins to be independently set as an input or output. Its low standby current consumption makes it ideal for battery-powered applications, and the inclusion of an interrupt pin reduces the need for the host MCU to constantly poll the I/O expander.

Applications

Getting Started

To evaluate this part, use the TCA9555EVM evaluation module or connect the VQFN package to an I2C-capable microcontroller like an ESP32 or STM32. Ensure the AD0, AD1, and AD2 address pins are tied to GND or VCC to set the I2C slave address, and include 4.7k ohm pull-up resistors on the SDA and SCL lines.

TCA9555 Family

Comparing specs that differ across variants. The current part is highlighted.

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