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TCA9545A: TCA9545A can support UART signal for switching

Thomas Chang15933
Expert 4770 points
Part Number: TCA9545A


Dear Team:

 Our customer would like to use TCA9545A for I2C and UART for MUX switching function.

I know USB3 MUX,and TCA9545 is for I2C MUX.

Whether TCA9545A can support UART MUX?

If TCA9545A can not do it, could you tell me which is suitable part?

  • 0
    TI__Guru* 78111 points
    Hey Thomas,

    I'm a bit confused with what you are trying to do here, can you show me what the signals are connected to in a schematic view? You plan on using I2C to configure the MUX and then using UART to talk? Where does the USB3.0 come into this?

    Can you provide more context as well. What is the application and end equipment.

    Thanks,
    -Bobby
  • 0 in reply to BOBBY
    TI__Guru 62920 points
    Hi Thomas,

    Have you had a chance to look more into Bobby's questions above?

    One thing I'll add is that TCA9545A is not a typical analog switch that maintains a low-impedance path from input to output under all conditions. Rather, it is designed with open-drain signaling in mind (i.e., to support I2C) and will only conduct "low" level signals. High signals would make the switch high impedance so that a pull-up resistor external to the device could pull the line high. This allows for voltage level translation of I2C buses. However, it may present some challenges for applications that are intended to use signaling types other than open drain.

    Regards,
    Max