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TPS65982D Dual : Shorting A&B, Connecting A1&B2, A2&B1

Naokazu Kinjoh
Intellectual 2740 points

Hi team,

Is there anyway can make EC knows connecting Port A and B in dual PDC notebook application?

The notebook power engineer wants to avoid the following 2 cases:

1. Shorting port A and Port B, current direction A->B or B->A

2. Connecting 2 PCs with 2 Type-C cables, Current direction PC1->PC2->PC1

If the device ID by Alternate mode can not be read because of unknown manufacturer, the EC can not recognize the connection PDCA and PDCB?

Please advise.

  • 0
    TI__Intellectual 1010 points
    There is nothing automatically generated by the chip set that can detect either of these cases. In both cases the EC would have to actively try to figure out if such connections were made.

    For the first case (connecting two ports on the same laptop), the EC may be able to detect the two ports have been connected to each other by looking at the timing of plug events. If plug events from both ports happen at the about the same time, the EC might suspect that the ports have been connected. The EC could then send commands to one port and see if they cause reactions on the other port.

    The second case (making two connections between two laptops) is much harder to detect. I can't think of any easy detection algorithms for this.
  • 0 in reply to Brad Hale
    TI__Intellectual 2740 points

    Is the Alternate mode not able to be used for detecting what was connected before/after OCP protection functioned?

  • 0 in reply to Naokazu Kinjoh
    TI__Intellectual 1010 points

    What does OCP (over current protection) have to do with this?

    All features are available. Maybe there is a way for the EC to use alternate mode information to determine the second case. But, it is not obivious to me. If you figure out a way, please let me know.