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PCA9555RGER

TIPCA9555RGER

Texas Instruments
I/O Expander 16 I2C, SMBus 400 kHz 24-VQFN (4x4)
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Overview

The PCA9555RGER is a 16-bit I/O expander that communicates with a host microcontroller via the I2C or SMBus interface. It allows engineers to add more GPIOs to their system when the microcontroller's native I/O count is insufficient. With its 5-V tolerant I/O ports and 400 kHz clock frequency, it is suitable for various embedded applications.

Why Choose This Part

This I/O expander features an active-low interrupt output, allowing the host microcontroller to be notified of input changes without constant polling. Its 5-V tolerant I/O ports offer design flexibility, supporting various logic levels. The PCA9555RGER also provides high-current drive capability for directly driving LEDs, simplifying circuit design.

Applications

Server and Datacom Equipment
Used for monitoring and controlling various system parameters, such as fan speed, power supply status, or chassis intrusion detection, where additional GPIOs are needed.
Industrial Control Systems
Extending I/O capabilities for interfacing with sensors, actuators, and indicators in factory automation and control panels.
White Goods
Providing additional control lines for buttons, LEDs, and status indicators in consumer appliances.
Medical Equipment
Adding general-purpose I/O for user interfaces or internal system monitoring in non-critical medical devices.
Test and Measurement Equipment
Expanding the digital I/O for controlling test fixtures or reading status signals from devices under test.

Key Specifications

Features POR
Interface I2C, SMBus
Output Type Push-Pull
Mounting Type Surface Mount
Number of I/O 16
Package / Case 24-VFQFN Exposed Pad
Clock Frequency 400 kHz
Interrupt Output Yes
Voltage - Supply 2.3V ~ 5.5V
Operating Temperature -40degC ~ 85degC
Supplier Device Package 24-VQFN (4x4)
Current - Output Source/Sink 10mA, 25mA

Getting Started

To get started with the PCA9555RGER, connect its I2C interface to your microcontroller. Most development boards and microcontrollers have I2C libraries that can be used to communicate with the expander. Consult the datasheet for address selection via the three hardware address pins and register configurations for I/O control and polarity inversion.

Part of PCA95xx I/O Expanders family » PCA9555

PCA9555 Family

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

Part Number Package Stock
PCA9555RGER (this part) VFQFN-24 —
PCA9555DBR SSOP-24 1,381
PCA9555PWJ (Nexperia USA Inc.) TSSOP-24 157
PCA9555BSHP (NXP USA Inc.) VFQFN-24 —
PCA9555DGVR TFSOP-24 —
PCA9555DW SOIC-24 1,967
Also available as: PCA9555DWR, PCA9555

Also Consider

MCP23017 MCHPMicrochip Technology - The MCP23017 is a popular 16-bit I/O expander with an I2C interface, offering similar functionality and broad community support.

Categories

Interface ICs > I/O Expanders