PCA9543APW

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9543APW is a multiplexer/demultiplexer IC that allows multiple devices to share a single communication bus. It provides a simple solution for expanding the capacity of I2C or SMBus systems.

Characteristics: - Low voltage operation (1.65V to 5.5V) - Four bidirectional channels - Individual enable control for each channel - High-speed I2C bus interface (up to 400kHz) - Small package size (TSSOP-16) - RoHS compliant

Package: TSSOP-16

Essence: The PCA9543APW is designed to simplify the design and implementation of complex I2C systems by enabling multiple devices to communicate over a single bus.

Packaging/Quantity: The PCA9543APW is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 1.65V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• I2C Bus Frequency: Up to 400kHz
• Channel Resistance: 10Ω (maximum)
• Leakage Current: 10μA (maximum)
• Package Type: TSSOP-16

Pin Configuration

The PCA9543APW has a total of 16 pins, which are assigned as follows:

1. SDA (Serial Data Input/Output)
2. SCL (Serial Clock Input)
3. EN0 (Channel 0 Enable)
4. EN1 (Channel 1 Enable)
5. EN2 (Channel 2 Enable)
6. EN3 (Channel 3 Enable)
7. GND (Ground)
8. NC (No Connection)
9. NC (No Connection)
10. NC (No Connection)
11. NC (No Connection)
12. SDA0 (Channel 0 Serial Data Input/Output)
13. SCL0 (Channel 0 Serial Clock Input)
14. SDA1 (Channel 1 Serial Data Input/Output)
15. SCL1 (Channel 1 Serial Clock Input)
16. VCC (Supply Voltage)

Functional Features

• Multiplexes up to four I2C or SMBus channels onto a single bus
• Individual enable control for each channel allows selective communication with specific devices
• Bidirectional data flow between the selected channel and the shared bus
• Supports high-speed communication up to 400kHz
• Low voltage operation enables compatibility with a wide range of systems
• RoHS compliant, ensuring environmental friendliness

Advantages and Disadvantages

Advantages: - Simplifies complex I2C system designs - Enables efficient utilization of limited communication resources - Allows selective communication with specific devices - Supports high-speed data transfer - Small package size saves board space

Disadvantages: - Limited to four channels, may not be suitable for larger systems - Requires careful consideration of channel assignment and enable control

Working Principles

The PCA9543APW operates by selectively connecting one of its four bidirectional channels to the shared I2C or SMBus communication bus. This is achieved through the individual enable control pins (EN0-EN3), which allow the user to activate or deactivate each channel independently.

When a channel is enabled, the corresponding serial data input/output (SDA) and serial clock input (SCL) pins are connected to the shared bus, enabling communication with the devices connected to that channel. The other channels remain disconnected from the bus, preventing interference.

By controlling the enable pins, the user can switch between different channels and communicate with multiple devices using a single bus, effectively expanding the capacity of the I2C or SMBus system.

Detailed Application Field Plans

The PCA9543APW finds applications in various fields where multiple devices need to communicate over a single I2C or SMBus bus. Some potential application areas include:

1. Industrial Automation: Controlling and monitoring multiple sensors, actuators, and modules connected to an I2C bus.
2. Automotive Electronics: Managing communication between different subsystems, such as infotainment systems, climate control, and driver assistance modules.
3. Consumer Electronics: Enabling communication between various components in devices like smartphones, tablets, and smart home appliances.
4. Medical Devices: Facilitating communication between different medical sensors, monitors, and control units.
5. Internet of Things (IoT): Integrating multiple IoT devices into a network by sharing a common I2C or SMBus bus.

Alternative Models

• PCA9544APW: Similar to PCA9543APW but with four additional channels, providing a total of eight channels.
• TCA9548APW: An octal I2C multiplexer/demultiplexer with eight channels