PCA9541APW/03,112

Product Overview

• Category: Integrated Circuit
• Use: I2C Multiplexer
• Characteristics:
  • Allows multiple I2C devices to share the same I2C bus
  • Provides a simple solution for expanding the number of I2C devices in a system
  • Supports hot-swapping of devices
• Package: TSSOP-20
• Essence: Multiplexes I2C signals to enable communication with multiple devices using a single I2C bus.
• Packaging/Quantity: Tape and Reel, 2500 units per reel.

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• I2C Bus Frequency: Up to 400kHz
• Number of Channels: 4
• Address Selection: 3 hardware address pins (A0, A1, A2)
• Standby Current: 10μA maximum
• Low-Level Input Voltage: -0.5V minimum
• High-Level Input Voltage: VDD + 0.5V maximum
• Output Voltage Swing: 0V to VDD
• Output Current: ±10mA

Pin Configuration

The PCA9541APW/03,112 has a TSSOP-20 package with the following pin configuration:

┌───┬───┐ │ 1 │ 20│ │ 2 │ 19│ │ 3 │ 18│ │ 4 │ 17│ │ 5 │ 16│ │ 6 │ 15│ │ 7 │ 14│ │ 8 │ 13│ │ 9 │ 12│ │10 │ 11│ └───┴───┘

Functional Features

• Allows multiple I2C devices to be connected to a single I2C bus.
• Supports hot-swapping of devices without interrupting the communication.
• Each channel can be individually enabled or disabled using software control.
• Provides a simple solution for expanding the number of I2C devices in a system.

Advantages and Disadvantages

Advantages: - Enables efficient utilization of the I2C bus by multiplexing multiple devices. - Simplifies the design by reducing the number of required I2C buses. - Supports hot-swapping, allowing devices to be added or removed without disrupting the system.

Disadvantages: - Limited to a maximum of four channels. - Requires careful consideration of address selection to avoid conflicts with other I2C devices.

Working Principles

The PCA9541APW/03,112 is an I2C multiplexer that allows multiple I2C devices to share the same I2C bus. It works by selectively connecting one of the four channels to the I2C bus, while keeping the other channels disconnected. This enables communication with different devices sequentially, effectively expanding the number of devices that can be connected to a single I2C bus.

The device uses three hardware address pins (A0, A1, A2) to set its own I2C address. By configuring these pins, the user can select the desired channel to be connected to the I2C bus. The selected channel remains connected until another channel is chosen.

Detailed Application Field Plans

The PCA9541APW/03,112 finds applications in various scenarios where multiple I2C devices need to be connected to a single I2C bus. Some potential application fields include:

1. Industrial Automation: Control systems that require communication with multiple I2C-based sensors, actuators, and modules.
2. Consumer Electronics: Devices with multiple I2C peripherals, such as smart TVs, set-top boxes, and gaming consoles.
3. Automotive: In-vehicle communication systems that connect various I2C devices, such as sensors, displays, and control modules.
4. Internet of Things (IoT): IoT devices that rely on I2C communication for connecting sensors, actuators, and other peripherals.

Detailed and Complete Alternative Models

1. PCA9540B: 2-channel I2C multiplexer with the same package and similar features.
2. PCA9542A: 4-channel I2C multiplexer with a different package and additional features like interrupt output.
3. TCA9548A: 8-channel I2C multiplexer with a different package and extended channel count.

These alternative models provide options with varying channel counts and additional features to suit different application requirements.

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