PCA9532

series introduction

# PCA9532 Product Series Introduction

## 1. Overview
The PCA9532 is a highly versatile and widely - used integrated circuit product series developed by NXP Semiconductors. It belongs to the family of I²C - bus and SMBus - compatible 16 - bit I/O expanders with integrated LED drivers. This product series is designed to provide an efficient solution for applications that require additional input/output ports and LED control capabilities, especially in scenarios where space and pin - count on the main microcontroller are limited.

## 2. Key Features

### 2.1 I²C and SMBus Compatibility
- The PCA9532 communicates with the host microcontroller via the I²C or SMBus interface. This standard communication protocol is widely supported by a vast range of microcontrollers, making it easy to integrate into existing systems. It operates at a clock frequency of up to 400 kHz, allowing for relatively fast data transfer between the PCA9532 and the host device.
- The device has a programmable address, which means multiple PCA9532 chips can be connected to the same I²C or SMBus bus. This feature enables the expansion of the number of available I/O ports and LED drivers in a single system, providing scalability for different application requirements.

### 2.2 16 - Bit I/O Expansion
- It offers 16 general - purpose I/O (GPIO) pins. These pins can be individually configured as either inputs or outputs. When configured as inputs, they can be used to read external signals such as sensor data, switch states, etc. When set as outputs, they can drive external loads like relays, small motors, or other digital devices.
- Each GPIO pin has an associated interrupt function. This allows the PCA9532 to generate an interrupt signal to the host microcontroller when a change in the input state of a configured pin is detected. This feature is very useful in applications where real - time monitoring of external events is required, as it reduces the need for the microcontroller to continuously poll the input pins.

### 2.3 Integrated LED Drivers
- One of the standout features of the PCA9532 is its integrated LED drivers. It can control up to 16 LEDs, providing a convenient solution for applications that require LED indication, such as status displays, backlighting, or decorative lighting.
- The LED drivers support different modes of operation, including constant current, pulse - width modulation (PWM), and blinking. In constant - current mode, the PCA9532 can provide a stable current to the LEDs, ensuring consistent brightness. The PWM mode allows for dimming control of the LEDs, enabling the adjustment of brightness levels. The blinking mode can be used to create attention - grabbing visual effects.

### 2.4 Low Power Consumption
The PCA9532 is designed with low - power operation in mind. It has a low standby current consumption, which is beneficial for battery - powered applications. In addition, the device can be put into a low - power shutdown mode when not in use, further reducing power consumption and extending the battery life of the overall system.

## 3. Applications

### 3.1 Consumer Electronics
- In smartphones and tablets, the PCA9532 can be used for LED backlighting control of small displays or for indicating the status of various functions such as charging, incoming calls, or notifications. It can also be used to expand the number of available I/O ports for connecting external accessories.
- In smart home devices like smart plugs and thermostats, the PCA9532 can be used to read the status of sensors (e.g., temperature sensors, motion sensors) and control the operation of relays or LEDs for status indication.

### 3.2 Industrial Automation
- In industrial control

Images for reference

24-HVQFN,SOT616

24-SOIC

24-TSSOP

Datasheets

• LED Controllers Leaflet
• PCA9532
• I2C-Bus Solutions Guide

Partlist