PCA9545ADGVR

Product Overview

• Category: Integrated Circuit (IC)
• Use: I2C Multiplexer
• Characteristics: Low-voltage, 4-channel multiplexer with I2C interface
• Package: VSSOP-24
• Essence: Allows multiple I2C devices to share a single I2C bus
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.65V to 5.5V
• I2C Bus Voltage Level: 1.8V to 5.5V
• Maximum Frequency: 400kHz
• Number of Channels: 4
• Address Selection: 3 hardware address pins
• Standby Current: 10µA (typical)

Pin Configuration

The PCA9545ADGVR has a total of 24 pins in the VSSOP package. The pin configuration is as follows:

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| | | PCA9545ADGVR | |_______________________________________| | | | 1 2 3 4 5 | | _______________________________ | | | | | | 1 | A0 A1 A2 GND SDA SCL | | | |_______________________________| | | | | 6 7 8 9 10 | | _______________________________ | | | | | | 2 | NC NC NC NC INT VCC | | | |_______________________________| | | | | 11 12 13 14 15 | | _______________________________ | | | | | | 3 | NC NC NC NC SDA1 SCL1| | | |_______________________________| | | | | 16 17 18 19 20 | | _______________________________ | | | | | | 4 | NC NC NC NC SDA2 SCL2| | | |_______________________________| | |_______________________________________| ```

Functional Features

• Allows multiple I2C devices to be connected to a single I2C bus
• Supports up to 4 channels for device selection
• Provides automatic switching between channels based on I2C commands
• Low standby current consumption for power efficiency
• Compatible with both 1.8V and 5V logic levels

Advantages and Disadvantages

Advantages: - Simplifies I2C bus management by enabling multiple devices to share a single bus - Reduces the number of required I2C pins on the microcontroller - Enables efficient communication with multiple I2C devices without interference

Disadvantages: - Limited to 4 channels, which may not be sufficient for complex systems with numerous I2C devices - Requires careful consideration of address conflicts when multiple multiplexers are used in the same system

Working Principles

The PCA9545ADGVR is an I2C multiplexer that allows multiple I2C devices to share a single I2C bus. It operates by selectively connecting one of the four input channels to the output channel, effectively routing the I2C signals from the selected channel to the bus. The channel selection is controlled through the I2C interface by sending specific commands to the multiplexer.

When a command is received, the PCA9545ADGVR switches the appropriate channel and connects it to the output. This enables communication with the selected I2C device on the shared bus. The multiplexer also supports interrupt functionality, allowing the microcontroller to be notified when a channel switch occurs.

Detailed Application Field Plans

The PCA9545ADGVR finds applications in various scenarios where multiple I2C devices need to be connected to a single I2C bus. Some common application fields include:

1. Sensor Networks: In sensor networks, multiple sensors often need to communicate with a central microcontroller. The PCA9545ADGVR can be used to connect multiple sensors to a single I2C bus, simplifying the wiring and reducing the number of required I2C pins on the microcontroller.

2. Industrial Control Systems: In industrial control systems, numerous I2C devices such as motor controllers, temperature sensors, and display modules may need to be connected. The PCA9545ADGVR allows efficient management of these