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TCA9555DBR

TITCA9555DBR

Texas Instruments
I/O Expander 16 I2C, SMBus 400 kHz 24-SSOP
NRND1,247 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The TCA9555DBR is a 16-bit I/O expander that interfaces to microcontrollers via the I2C or SMBus interface. It operates from a supply voltage of 1.65V to 5.5V, making it suitable for a wide range of systems. This device provides 16 additional GPIO pins, reducing the need for microcontrollers with a high pin count when more I/O is required.

Why Choose This Part

This I/O expander offers 16 configurable I/O ports, each 5V tolerant, operating over a wide supply range of 1.65V to 5.5V. Its I2C/SMBus interface supports clock frequencies up to 400 kHz, and it includes a Power-On Reset (POR) feature for reliable startup. The low quiescent current of 3.5uA (max) makes it suitable for power-sensitive applications.

Applications

Server and Telecom Equipment
Used to expand GPIO capabilities in complex server and telecommunications infrastructure where many status LEDs or control signals are needed.
Industrial Control Systems
Integrates into industrial automation for monitoring sensors or controlling actuators, providing extra I/O without increasing MCU complexity.
PC Peripherals
Enables additional buttons, LEDs, or switches in keyboards, mice, and other computer peripherals through a standard serial interface.
Battery-Powered Devices
Its low power consumption (3.5uA maximum run current) makes it suitable for power-sensitive applications where extending battery life is critical.
LED Control
Features latched outputs with high-current drive capability, suitable for directly driving LEDs without external buffering.
General-Purpose I/O Expansion
Provides a flexible way to add GPIOs to any microcontroller system that needs more input or output lines than available on the MCU itself.

Key Specifications

Features POR
Interface I2C, SMBus
Output Type Push-Pull
Mounting Type Surface Mount
Number of I/O 16
Package / Case 24-SSOP (0.209", 5.30mm Width)
Clock Frequency 400 kHz
Interrupt Output Yes
Voltage - Supply 1.65V ~ 5.5V
Operating Temperature -40degC ~ 85degC
Supplier Device Package 24-SSOP
Current - Output Source/Sink 10mA, 25mA

Getting Started

To get started with the TCA9555DBR, connect its SCL and SDA pins to your microcontroller's I2C bus. The three address pins (A0-A2) allow configuration of the I2C slave address. Libraries are commonly available for I2C communication on platforms like Arduino, ESP32, or bare-metal embedded C, simplifying read and write operations to its internal registers for controlling I/O lines.

TCA9555 Family

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

Part Number Package Stock
TCA9555DBR (this part) SSOP-24 1,247
TCA9555PWR TSSOP-24 11,546
TCA9555RTWR WFQFN-24 2,030
Also available as: TCA9555RGER

Also Consider

MCP23017 MCHPMicrochip Technology - This is another popular 16-bit I/O expander with an I2C interface, offering similar functionality and a wide operating voltage range.
TCA9539PWR TITexas Instruments - For applications requiring a smaller footprint, the TCA9539 offers 16-bit remote I/O expansion for I2C applications in a more compact package.

Categories

Interface ICs > I/O Expanders Microcontrollers > Texas Instruments