TCA9545APWR

Product Overview

Category

TCA9545APWR belongs to the category of integrated circuits (ICs).

Use

This product is commonly used as a multiplexer/demultiplexer switch for I2C-bus applications.

Characteristics

• TCA9545APWR is a low-voltage, 8-channel I2C switch.
• It operates from 1.65V to 5.5V, making it suitable for various applications.
• The device allows bidirectional voltage-level translation between different I2C buses.
• It supports hot insertion and removal of devices without disrupting the I2C bus.
• TCA9545APWR has an active-low reset input that resets the I2C bus switches to their default state.

Package and Quantity

The TCA9545APWR IC is available in a TSSOP-24 package. It is typically sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage Range: 1.65V to 5.5V
• Number of Channels: 8
• I2C Bus Compatibility: Standard-mode, Fast-mode, Fast-mode Plus, and High-speed mode
• Operating Temperature Range: -40°C to +85°C
• Package Type: TSSOP-24

Pin Configuration

The TCA9545APWR IC has a total of 24 pins arranged as follows:

```

---

| | | TCA9545APWR | |_______________________________________|

   Pin Configuration (TSSOP-24)

    1   2   3   4   5   6   7   8
  ---------------------------------
 |                                 |
 |                                 |
 |                                 |
 |                                 |
 |                                 |
 |                                 |
 |                                 |
 ---------------------------------
    9  10  11  12  13  14  15  16
  ---------------------------------
 |                                 |
 |                                 |
 |                                 |
 |                                 |
 |                                 |
 |                                 |
 |                                 |
 ---------------------------------
   17  18  19  20  21  22  23  24

```

Functional Features

• TCA9545APWR allows the connection of multiple I2C devices to a single I2C bus.
• It provides independent channel selection through its I2C-bus interface.
• The device supports hot swapping of I2C devices without interrupting the bus communication.
• TCA9545APWR has an active-low reset input that resets all the switches to their default state.

Advantages and Disadvantages

Advantages

• Enables efficient utilization of I2C bus resources by multiplexing multiple devices onto a single bus.
• Supports bidirectional voltage-level translation, allowing compatibility between different I2C buses.
• Hot insertion and removal capability simplifies system maintenance and upgrades.

Disadvantages

• Requires careful consideration of bus timing and addressing to avoid conflicts when multiple devices are connected.

Working Principles

TCA9545APWR operates as a multiplexer/demultiplexer switch for I2C-bus applications. It allows multiple I2C devices to share a common I2C bus by providing individual channel selection. The device uses an I2C-bus interface to control the channel selection and communicate with the connected devices. It also incorporates voltage-level translation circuitry to ensure compatibility between different I2C buses operating at different voltage levels.

Application Field Plans

The TCA9545APWR IC finds application in various scenarios where multiple I2C devices need to be connected to a single I2C bus. Some potential application fields include:

1. Industrial Automation: Controlling multiple sensors, actuators, and modules through a centralized I2C bus.
2. Consumer Electronics: Managing multiple peripherals, such as displays, touchscreens, and sensors, in smartphones, tablets, and wearable devices.
3. Internet of Things (IoT): Enabling communication between multiple IoT devices with different I2C interfaces.
4. Automotive Systems: Facilitating the integration of various I2C-based components, such as sensors, ECUs, and infotainment systems.

Alternative Models

Here are some alternative models that offer similar functionality to TCA9545APWR:

1. PCA9548APW: 8-channel I2C-bus multiplexer/demultiplexer switch with reset function.
2. TCA9546APWR: 4-channel I2C-bus multiplexer/demultiplexer switch with interrupt output.
3. TS5A23157DGSR: 4-channel bidirectional analog switch with I2C control.

These alternatives provide options for different channel configurations, additional features,