PCA9543AD

Product Overview

• Category: Integrated Circuit
• Use: I2C Bus Multiplexer
• Characteristics: Low-voltage, 2-channel, bidirectional switch for I2C bus applications
• Package: TSSOP-14
• Essence: Enables multiple I2C devices to share a single I2C bus
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 2.3V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• I2C Bus Compatibility: Standard-mode, Fast-mode, Fast-mode Plus
• Channel-to-Channel Isolation: >5kV
• Maximum Frequency: 400kHz
• Standby Current: <1µA

Pin Configuration

The PCA9543AD has a total of 14 pins in the TSSOP package. The pin configuration is as follows:

1. SCL (Serial Clock Input)
2. SDA (Serial Data Input/Output)
3. A0 (Address Select Bit 0)
4. A1 (Address Select Bit 1)
5. EN (Enable Input)
6. GND (Ground)
7. SCL1 (Channel 1 Serial Clock Output)
8. SDA1 (Channel 1 Serial Data Input/Output)
9. SCL2 (Channel 2 Serial Clock Output)
10. SDA2 (Channel 2 Serial Data Input/Output)
11. NC (No Connection)
12. NC (No Connection)
13. VCC (Supply Voltage)
14. NC (No Connection)

Functional Features

• Allows multiple I2C devices to be connected to a single I2C bus
• Supports two independent bidirectional channels
• Each channel can be individually enabled or disabled
• Provides level shifting between the I2C bus and the channels
• Supports hot insertion and removal of devices on the bus
• Low standby current consumption for power-saving applications

Advantages and Disadvantages

Advantages: - Simplifies I2C bus design by reducing the number of required bus lines - Enables efficient use of available I2C addresses - Provides isolation between connected devices, preventing bus contention issues - Supports multiple voltage levels on the I2C bus

Disadvantages: - Limited to two channels, which may not be sufficient for complex systems with numerous I2C devices - Requires careful consideration of address assignment to avoid conflicts - Additional circuitry may be needed for level shifting if different voltage levels are used on the I2C bus

Working Principles

The PCA9543AD is a bidirectional switch that connects multiple I2C devices to a single I2C bus. It uses address selection bits (A0 and A1) to assign unique addresses to each channel. The enable input (EN) controls the activation of the channels.

When a specific channel is enabled, the corresponding serial clock (SCL) and serial data (SDA) lines are connected to the I2C bus. This allows communication between the selected channel and the master device on the bus. Other channels remain isolated from the bus.

The PCA9543AD also provides level shifting functionality, allowing devices operating at different voltage levels to communicate on the same I2C bus.

Detailed Application Field Plans

The PCA9543AD is commonly used in various applications where multiple I2C devices need to share a single I2C bus. Some typical application field plans include:

1. Industrial Control Systems: Used to connect multiple sensors, actuators, and control modules to a central controller via a single I2C bus.
2. Automotive Electronics: Enables communication between different subsystems, such as infotainment systems, climate control modules, and body control units, using a single I2C bus.
3. Consumer Electronics: Facilitates the integration of various I2C-based devices, such as touchscreens, display modules, and audio codecs, into a single system.
4. Medical Devices: Allows multiple sensors, monitors, and control units to communicate with a central processing unit through a shared I2C bus.

Detailed and Complete Alternative Models

1. PCA9544A: 4-channel I2C bus multiplexer with the same features as PCA9543AD but supports four independent channels.
2. TCA9548A: 8-channel I2C bus multiplexer with additional features like interrupt output and reset input.
3. TS5A23157: Dual-channel bidirectional analog switch with low on-resistance, suitable for I2C bus applications requiring voltage level shifting.

These alternative models offer different channel configurations and additional functionalities to suit specific application requirements.

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