EmbeddedRelated.com
    Parts   Interface ICs  I/O Expanders    PCA9534PW,118
PCA9534PW

PCA9534PW

MPN: PCA9534PW,118
NXP USA Inc.
I/O Expander 8 I2C, SMBus 400 kHz 16-TSSOP
Active11,036 in stock
Datasheet Digi-Key Compare Prices

Overview

The PCA9534PW is a low-power, 8-bit I/O expander for I2C-bus and SMBus applications. It provides a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, or LEDs while keeping the microcontroller pin count low. This device includes an internal power-on reset and a polarity inversion register to configure the input data inversion.

Why Choose This Part

The device features a very low standby current of 1 uA and supports a wide supply voltage range of 2.3V to 5.5V, making it suitable for battery-operated systems. It includes an active-LOW interrupt output to notify the host of input state changes, eliminating the need for continuous I2C polling.

Applications

System Status Monitoring
Connecting push buttons or chassis switches to a central processor via the I2C bus to monitor user input or enclosure security.
LED Control
Driving status indicator LEDs using the push-pull outputs to offload simple GPIO tasks from the MCU.
Power Switch Management
Managing enable pins for multiple LDOs or DC-DC converters in complex power-sequencing designs.

Key Specifications

Features POR
Interface I2C, SMBus
Output Type Push-Pull
Mounting Type Surface Mount
Number of I/O 8
Package / Case 16-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 16-TSSOP
Current - Output Source/Sink 10mA, 25mA

Getting Started

Connect the SCL and SDA lines to your I2C host with appropriate pull-up resistors and configure the three hardware address pins (A0, A1, A2) to set the device address. The internal power-on reset ensures the registers initialize to their default states at startup, allowing immediate communication at clock speeds up to 400 kHz.

Also Consider

TCA9534 TITexas Instruments - A pin-to-pin compatible alternative with a wider supply voltage range starting at 1.65V.
PCA9554A NXP USA Inc. - Offers similar functionality but with a different I2C address range to allow more devices on the same bus.

Categories

Interface ICs > I/O Expanders