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PCA9555PWJ

PCA9555PWJ

Nexperia USA Inc.
I/O Expander 16 I2C, SMBus 400 kHz 24-TSSOP
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Overview

The PCA9555PWJ is a 16-bit I/O expander with an I2C and SMBus interface, designed to provide additional General Purpose I/O (GPIO) lines to microcontrollers with limited I/O resources. It operates from a 2.3V to 5.5V supply and supports a 400 kHz clock frequency. The device includes an internal power-on reset and offers 5V tolerant I/Os.

Why Choose This Part

This I/O expander offers 16 additional GPIOs, providing a practical solution for microcontrollers with insufficient I/O pins, all via a standard I2C/SMBus interface. Its 5V tolerant I/Os allow seamless integration in mixed-voltage systems, and the latched outputs with 25mA drive capability can directly drive LEDs. The internal power-on reset ensures predictable startup behavior without external components.

Applications

Server and Datacenter Equipment
Used for managing control signals or status LEDs in server backplanes and other high-density digital systems, where I/O expansion is necessary for monitoring and control.
Industrial Control Systems
Enabling microcontrollers to interface with a greater number of sensors, actuators, and indicators on a factory floor, extending their control capabilities via I2C.
Telecommunications Equipment
Providing additional control and monitoring lines for network switches, routers, and base station equipment, enhancing system diagnostics and configuration options.
Consumer Electronics
Integrating more buttons, switches, or LED indicators into devices like smart home hubs, set-top boxes, and white goods without requiring a higher-pin-count microcontroller.
Medical Devices
Expanding I/O for user interfaces and system controls in compact medical instruments, where space is limited and an I2C interface is convenient.
Embedded Systems Prototyping
A valuable component for developers to quickly add I/O to their prototypes using a common serial interface, simplifying hardware design and reducing pin count requirements.

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 2.3V ~ 5.5V
Operating Temperature -40degC ~ 85degC
Supplier Device Package 24-TSSOP
Current - Output Source/Sink 10mA, 25mA

Getting Started

To get started with the PCA9555PWJ, connect its I2C lines (SDA, SCL) to your host microcontroller. Most microcontroller development environments include I2C master libraries that can be adapted to communicate with the PCA9555. Configure the device's I2C address using the A0-A2 pins. Refer to the Nexperia datasheet for register maps and example I2C sequences for configuring input/output directions and reading/writing I/O states.

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

Also Consider

MCP23017 MCHPMicrochip Technology - This is a popular 16-bit I/O expander with a similar I2C interface, often used in hobbyist and industrial applications.
TCA9539 TITexas Instruments - A 16-bit I/O expander from a major manufacturer, offering similar I2C functionality and interrupt output.

Categories

Interface ICs > I/O Expanders