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TPS389006-Q1: I2C Address Range

phytecBSC
Prodigy 97 points
Part Number: TPS389006-Q1
Other Parts Discussed in Thread: TPS389006

Hello.

Is there a more detailed description on how the TPS389006 decide on which I2C it has? Currently there is a small table in the datasheet, but don't really explain it any further. This question accurs, because the majority of the values are not that common and would need an extra feeder especially for this IC. So the idea is just to use more frequent one. For example a 47k for a 47.5k (which should be fine, as even a 1% tolerance is in that scope).

So my questions would be here:

  • How high can be the tolarance of the resistors?
  • Which range of resistors are still usable to select the respective I2C address? 
  • Which voltage range is needed for the the respective I2C address (Currently I assume that the voltage drop is measured with the 20uA current)?

Kind regards.

  • 0
    TI__Expert 5510 points

    Hello, 

    I will consult the team regarding this inquiry and provide an update by 7/25. 

    Regards, 

    Oscar Ambriz

  • +1 in reply to Oscar Ambriz
    TI__Expert 5510 points

    Hello, 

    I was able to obtain feedback form the team. The max tolerance allowed is +/-5% but 1% resistors are recommended. Additionally, can you expand a bit more on your last question "Which voltage range is needed for the the respective I2C address" 

  • 0 in reply to Oscar Ambriz
    Prodigy 97 points

    Thanks for the feedback. Maybe you can take this forward to include it in the datasheet? I guess this would be nice to have. 

    My assumption is that the IC just checks the voltage drop with the choosen resistor and the provided 20uA current source. But as you said, that you have a 5% margin in it, this indirectly answers that question aswell. Or at least it won't matter that much anymore.