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TPS65987D: I2C multi-master

David Mckinney
Expert 6630 points
Part Number: TPS65987D
Other Parts Discussed in Thread: TPS65988

Can you operate 2x TPS65987D on the same I2C master bus going to a MCU? In other words, both TPS65987D have Master I2C outputs connected to the same MCU slave I2C input?

Does the TPS65987D support multi-master? If it doesn't, is there any issue with configuration on a testboard? We are trying to get around using a TPS65988 dual port device on a test board only configuration as we can keep the fw the same on the TPS65987D.

  • 0
    TI__Expert 8170 points

    Hi, 

    87D doesn't support Multi-master. 

     If it doesn't, is there any issue with configuration on a testboard? We are trying to get around using a TPS65988 dual port device on a test board only configuration as we can keep the fw the same on the TPS65987D.

    >>> I did not get you. Please explain. 

    Why don't you use 88 (Dual port controller) instead of 87?

    Thanks
    Prajith 

  • 0 in reply to Prajith Cheerakkoda
    TI__Expert 6630 points

    Thanks, that's what I thought.  So the main thing we lose is auto arbitration on the controller side. If we control comm initiation on the bus, say by not allowing simultaneous port plug-ins, we shouldn't have to worry about bus contention. Does that sound correct?

  • 0 in reply to David Mckinney
    TI__Expert 8170 points

    Hi David,

    Simultaneous port plug-in is a use case. Similarly, you will have to check all other possibilities based on how you are going to use the PD controllers in your project. 

    Thanks
    Prajith