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TCA39306: The electrical characteristic difference in Bus switching mode

Shoo Saga
Intellectual 1661 points
Part Number: TCA39306

Hi Team,

My customer asked a question.

Regarding to the datasheet (chapter 9.3.1),  the difference between Vref1/2 connected VCC(Fig 8.5) and Vref1/2 connected GND(Fig 9-6) in bus switching mode is only power consumption and communication speed?

Is there any difference about electrical characteristic in this case?


Thanks,

Shoo

  • 0
    Guru 260270 points

    When the EN pin is controlled independently and not connected to any VREF, then the VREF1/VREF2 pins behave like a third channel. It does not matter what voltage they have, they have no effect on the other twochannels.

  • +1
    TI__Mastermind 27353 points

    Hi Shoo,

    Clemens answered the question well.

    The reference voltage pins really come into play when the level translation is desired. In the switch mode configuration, the VREF pins behave like a third channel, so tying them to GND has very little effect on the I2C bus pins and over all functionality.

    Regards,

    Tyler