PCA9543APW

series introduction

# PCA9543APW Product Series Introduction

## 1. Overview
The PCA9543APW is a highly versatile and widely - used integrated circuit product series developed by NXP Semiconductors. It belongs to the category of I²C (Inter - Integrated Circuit) bus multiplexers/demultiplexers. These devices play a crucial role in modern electronic systems by enabling multiple I²C - compatible devices to share the same I²C bus, thus simplifying the overall system design and enhancing its flexibility.

## 2. Key Features

### 2.1 I²C Bus Expansion
- The PCA9543APW provides a simple and effective solution for expanding the number of I²C devices that can be connected to a single I²C master. It has two bidirectional I²C channels (A and B), which can be independently controlled. This allows the master to communicate with different sets of I²C slaves on each channel, effectively doubling the number of available I²C addresses in the system.
- For example, in a complex sensor - based system where multiple temperature, humidity, and pressure sensors are used, the PCA9543APW can be used to connect these sensors to the same I²C bus without address conflicts.

### 2.2 Low - Voltage Operation
- It is designed to operate over a wide voltage range, typically from 2.3V to 5.5V. This low - voltage operation makes it suitable for a variety of battery - powered and low - power applications. For instance, in portable medical devices or wearable electronics, where power consumption is a critical factor, the PCA9543APW can be used to manage the I²C communication while consuming minimal power.

### 2.3 High - Speed Communication
- The device supports high - speed I²C communication up to 400kHz, which is the Fast - Mode specification of the I²C protocol. This high - speed capability ensures that data can be transferred quickly between the I²C master and the connected slaves, making it suitable for applications that require real - time data acquisition and processing, such as industrial automation and automotive electronics.

### 2.4 Automatic Addressing
- The PCA9543APW has a built - in addressing mechanism. It can be configured with a unique 7 - bit I²C slave address, which is set by the logic levels on its address pins (A0). This allows multiple PCA9543APW devices to be connected to the same I²C bus, further expanding the system's capacity.

### 2.5 Power - On Reset
- It features a power - on reset (POR) function. When the device is powered on, it automatically resets to a known state, ensuring reliable operation from the start. This is particularly important in systems where the I²C bus needs to be initialized correctly to avoid communication errors.

## 3. Package and Pinout

### 3.1 Package Type
The PCA9543APW is available in a small - outline package (SOIC - 8). This package is widely used in the electronics industry due to its compact size and ease of soldering on printed circuit boards (PCBs). The small form factor makes it suitable for space - constrained applications, such as mobile devices and IoT modules.

### 3.2 Pinout Description
- **SDA and SCL Pins**: These are the standard I²C data (SDA) and clock (SCL) pins that connect to the I²C master. They are used to receive commands and data from the master.
- **SDA_A, SCL_A, SDA_B, and SCL_B Pins**: These pins are the I²C data and clock lines for channels A and B respectively

Images for reference

14-TSSOPa

14-TSSOP

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Datasheets

• PCA9543A
• PCA9543(A,B,C)
• I2C-Bus Solutions Guide

Partlist