PCA9544ADW

Product Overview

Category: Integrated Circuit (IC)

Use: The PCA9544ADW is a multiplexer/demultiplexer IC that allows multiple devices to share a single communication bus. It provides a simple solution for expanding the number of I2C or SMBus ports available in a system.

Characteristics: - 4-channel multiplexer/demultiplexer - I2C-bus and SMBus compatible - Low RON switches - Wide supply voltage range: 2.3V to 5.5V - High-speed I2C-bus interface (up to 400 kHz) - Power-up with all channels deselected - Active LOW interrupt output

Package: SO-24 Wide package

Essence: The PCA9544ADW is designed to simplify the management of multiple I2C or SMBus devices by allowing them to share a common bus. It eliminates the need for complex wiring and reduces the number of required I/O pins on the microcontroller.

Packaging/Quantity: The PCA9544ADW is available in a SO-24 Wide package. It is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: Up to 400 kHz
• Channel ON Resistance: 7Ω (typical)
• Channel-to-Channel Matching: 1Ω (typical)
• Quiescent Current: 2µA (maximum)
• Package Type: SO-24 Wide

Pin Configuration

The PCA9544ADW has a total of 24 pins, which are assigned as follows:

Pin 1: SDA (Serial Data Input/Output) Pin 2: SCL (Serial Clock Input) Pin 3: A0 (Address Bit 0) Pin 4: A1 (Address Bit 1) Pin 5: A2 (Address Bit 2) Pin 6-9: Channel 0 Inputs/Outputs Pin 10-13: Channel 1 Inputs/Outputs Pin 14-17: Channel 2 Inputs/Outputs Pin 18-21: Channel 3 Inputs/Outputs Pin 22: GND (Ground) Pin 23: VCC (Supply Voltage) Pin 24: INT (Interrupt Output)

Functional Features

• Multiplexes up to four I2C or SMBus channels onto a single bus
• Allows communication with multiple devices using a single microcontroller
• Supports high-speed data transfer up to 400 kHz
• Low ON resistance switches minimize signal distortion
• Power-up with all channels deselected ensures safe initialization
• Active LOW interrupt output for system status indication

Advantages and Disadvantages

Advantages: - Simplifies the management of multiple I2C or SMBus devices - Reduces wiring complexity and I/O pin requirements - Enables efficient utilization of the communication bus - High-speed data transfer capability - Low ON resistance switches for minimal signal distortion

Disadvantages: - Limited to a maximum of four channels - Requires additional control logic for channel selection - May introduce additional latency in the communication process

Working Principles

The PCA9544ADW operates by selectively connecting one of the four input channels to the output bus. The channel selection is controlled through the I2C-bus interface, allowing the microcontroller to choose which device it wants to communicate with. When a particular channel is selected, the corresponding inputs and outputs are connected to the bus, enabling data transfer between the microcontroller and the selected device.

Detailed Application Field Plans

The PCA9544ADW finds applications in various scenarios where multiple I2C or SMBus devices need to be connected to a single bus. Some common application field plans include:

1. Industrial Automation: Controlling multiple sensors, actuators, and modules through a centralized microcontroller.
2. Automotive Electronics: Managing communication with various subsystems, such as infotainment systems, climate control, and advanced driver-assistance systems (ADAS).
3. Internet of Things (IoT): Integrating multiple IoT devices into a network, enabling seamless data exchange and control.
4. Medical Devices: Interfacing with multiple medical sensors and instruments for monitoring and diagnostics.
5. Consumer Electronics: Enabling communication between different components in devices like smartphones, tablets, and smart home appliances.

Detailed and Complete Alternative Models

• PCA9543ADW: 3-channel multiplexer/demultiplexer IC
• PCA9545ADW: 4-channel multiplexer/demultiplexer IC with interrupt logic
• TCA9548A: 8-channel I2C multiplexer IC