The TCA9543A is a dual bidirectional translating switch controlled by the I2C bus. The SCL/SDA upstream pair fans out to two downstream pairs, or channels. Either individual SCn/SDn channel or both channels can be selected, determined by the contents of the programmable control register. Two interrupt inputs (INT1–INT0), one for each of the downstream pairs, are provided. One interrupt output (INT) acts as an AND of the two interrupt inputs.
An active-low reset (RESET) input allows the TCA9543A to recover from a situation where one of the downstream I2C buses is stuck in a low state. Pulling RESET low resets the I2C state machine and causes both of the channels to be deselected, as does the internal power-on reset function.
The pass gates of the switches are constructed such that the VCC terminal can be used to limit the maximum high voltage, which will be passed by the TCA9543A. This allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O terminals are 5.5-V tolerant.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | TCA9543A Low Voltage 2-Channel I2C Bus Switch With Interrupt Logic And Reset datasheet (Rev. B) | PDF | HTML | Oct 29, 2019 |
| Application brief | Best Practices: I2C Devices on an I3C Shared Bus | PDF | HTML | Mar 30, 2023 | |
| Application note | I2C Solutions for Hot Swap Applications (Rev. A) | Jan 31, 2023 | ||
| Application note | I2C Dynamic Addressing | Apr 25, 2019 | ||
| Application note | Choosing the Correct I2C Device for New Designs | PDF | HTML | Sep 7, 2016 | |
| Selection guide | I2C Infographic Flyer | Dec 3, 2015 | ||
| Application note | Understanding the I2C Bus | PDF | HTML | Jun 30, 2015 | |
| Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | May 15, 2015 | ||
| Application note | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | Feb 13, 2015 |
For additional terms or required resources, click any title below to view the detail page where available.
The TCA9548AEVM is designed to evaluate and demonstrate the functionality of TI’s TCA954xA family of I2C switches. The TCA9548AEVM can be used as a standalone evaluation module to interface with an existing system or paired with the MSP430 Lauchpad which serves as the I2C master and power supply (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (D) | 14 | Ultra Librarian |
| TSSOP (PW) | 14 | Ultra Librarian |
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