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TCA9555PWR

TITCA9555PWR

Texas Instruments
Interface - I/O Expanders Remote 16B I2C & SMB us I/O Expander
11,546 in stock
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Overview

The TCA9555PWR is a 16-bit I/O expander designed for I2C and SMBus applications, providing a simple way to add general-purpose I/O to a system via a two-wire interface. It operates across a wide voltage range of 1.65V to 5.5V and includes an interrupt output to notify the host processor of input state changes without constant polling.

Why Choose This Part

The device features high-current drive capability of up to 25mA per pin, making it suitable for directly driving LEDs without external transistors. It also includes a polarity inversion register, allowing engineers to configure the active-high or active-low logic state of the inputs in software.

Applications

User Interface Controls
Driving front-panel LEDs and monitoring push-button switches or keypads in industrial and consumer equipment.
System Status Monitoring
Aggregating low-speed digital signals such as power-good indicators, thermal alarms, and chassis intrusion switches.
Mixed-Voltage Level Shifting
Interfacing low-voltage microcontrollers with 5V digital logic thanks to its 5V-tolerant I/O ports.

Key Specifications

Features POR
Interface I2C, SMBus
Output Type Push-Pull
Mounting Type Surface Mount
Number of I/O 16
Package / Case 24-TSSOP (0.173", 4.40mm Width)
Clock Frequency 400 kHz
Interrupt Output Yes
Voltage - Supply 1.65V ~ 5.5V
Operating Temperature -40degC ~ 85degC
Supplier Device Package 24-TSSOP
Current - Output Source/Sink 10mA, 25mA

Getting Started

To implement this part, connect the SDA and SCL lines to your I2C host with appropriate pull-up resistors and configure the three hardware address pins (A0, A1, A2) to set the unique slave address. Evaluation can be performed using the TCA9555EVM module or by integrating the 24-TSSOP footprint onto a breadboard adapter for use with Arduino or STM32 development environments.

TCA9555 Family

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

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

Also Consider

MCP23017 MCHPMicrochip Technology - A widely used 16-bit alternative that offers a higher 1.7 MHz I2C clock speed and configurable pull-up resistors on all pins.
TCA9535PWR TITexas Instruments - Functionally similar but omits the internal pull-up resistors on the I/O pins, which can be preferable in certain low-power configurations.

Categories

Interface ICs > I/O Expanders