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TCA9539PWR

TITCA9539PWR

Texas Instruments
Interface - I/O Expanders Rem 16B I2C & SMBus Low-Pwr I/O Expander
7,930 in stock
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Overview

The TCA9539PWR is a 16-bit I/O expander designed for I2C-bus or SMBus applications, providing a remote I/O expansion for most microcontroller families. It operates over a wide voltage range and features an interrupt output to notify the host processor of input state changes, alongside a hardware reset input to initialize the device without power cycling.

Why Choose This Part

This device offers low standby current consumption and a wide operating voltage range, making it suitable for battery-powered or mixed-voltage systems. The inclusion of both an interrupt pin and a dedicated reset pin allows for more robust system management and faster response times compared to basic expanders.

Applications

Industrial Control Panels
Expanding GPIO counts for monitoring switches, sensors, and controlling indicator LEDs in rugged environments.
Server Motherboards
Managing system-level signals such as power-good indicators, reset signals, and fan alerts via the I2C management bus.
Gaming and Slot Machines
Interfacing with numerous buttons and peripheral sensors where local microcontroller pins are insufficient.
Home Automation Hubs
Consolidating low-speed digital inputs and outputs from various smart home sensors into a single I2C interface.

Getting Started

To evaluate this part, use the TCA9539EVM evaluation module which allows for direct connection to I2C controllers. In firmware, configure the I2C address via the A0 and A1 pins, and use standard I2C write commands to set the Configuration, Output, and Polarity Inversion registers.

Also Consider

MCP23017-E/SS MCHPMicrochip Technology - Offers a higher-speed I2C interface (up to 1.7MHz) and configurable interrupt output behaviors.