PCA9541PW/01,112

Product Overview

• Category: Integrated Circuit (IC)
• Use: I2C Multiplexer
• Characteristics: Low-voltage, 2-channel, bidirectional multiplexer for I2C-bus applications
• Package: TSSOP-16
• Essence: Allows multiple I2C devices to share a single I2C bus
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2.3 V to 5.5 V
• Operating Temperature Range: -40°C to +85°C
• I2C Bus Voltage Level Compatibility: 1.8 V, 2.5 V, 3.3 V, and 5 V
• Maximum Frequency: 400 kHz
• Number of Channels: 2
• Address Selection Inputs: 3-bit address pins
• Standby Current: 10 µA (typical)

Pin Configuration

The PCA9541PW/01,112 has a TSSOP-16 package with the following pin configuration:

```

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| | | 1 16 | | | | 2 15 | | | | 3 14 | | | | 4 13 | | | | 5 12 | | | | 6 11 | | | | 7 10 | | | | 8 9 | |_______________| ```

Functional Features

• Enables communication between a master device and multiple slave devices on a single I2C bus
• Supports hot insertion and removal of devices without disrupting the bus operation
• Allows individual selection of each channel using the address selection inputs
• Provides bidirectional voltage-level translation between different I2C bus voltages

Advantages and Disadvantages

Advantages: - Simplifies I2C bus design by reducing the number of required bus lines - Enables efficient utilization of limited I2C addresses - Supports multiple devices with different voltage levels on a single bus

Disadvantages: - Limited to 2 channels, may not be suitable for applications requiring more channels - Requires careful consideration of address conflicts when multiple multiplexers are used in a system

Working Principles

The PCA9541PW/01,112 is an I2C multiplexer that allows multiple I2C devices to share a single I2C bus. It operates by selectively connecting one of the two channels to the I2C bus based on the address selection inputs. The device supports bidirectional voltage-level translation, allowing devices with different voltage levels to communicate seamlessly.

Detailed Application Field Plans

The PCA9541PW/01,112 finds applications in various scenarios where multiple I2C devices need to be connected to a single I2C bus. Some potential application fields include:

1. Embedded Systems: Used in microcontroller-based systems to connect multiple sensors, actuators, and peripheral devices to a single I2C bus.
2. Industrial Automation: Enables communication between multiple I2C-based industrial sensors and control units, simplifying wiring and reducing costs.
3. Consumer Electronics: Facilitates connection of multiple I2C devices, such as displays, touch controllers, and audio codecs, to a single bus in smartphones, tablets, and other consumer electronic devices.

Detailed and Complete Alternative Models

1. PCA9540B: 4-channel I2C multiplexer with interrupt logic.
2. PCA9543A: 2-channel I2C multiplexer with reset function.
3. PCA9548A: 8-channel I2C multiplexer with individual enable control for each channel.

These alternative models offer different channel counts and additional features to suit specific application requirements.

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