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TPS65982: Select a different PDO after the negotiation has finished

Daniel Kociolek
Expert 3190 points

Part Number: TPS65982

Hi all,

I would like to ask you if it's possible to select a more suitable PDO than the highest /Voltage|Current|Power one?

Let's consider this example:

I have a sink that can accept from 6 to 20V. My charger can provide 5, 9, 12, 20V.

My sink negotiation policy is the following one: choose the highest voltage.

But in my application i would prefer a 9V contract. Can I somehow force my sink to chose this contract instead of the highest voltage/current/power one?

Do I have to uncheck "Autonegotiate Sink" and sthg else? Which registers should i manipulate to change it?

Thanks in advance,

Daniel

  • 0
    TI__Mastermind 36756 points
    Hi Daniel,

    An easy way to do this would be to only have a 5V and 9V Sink PDO on your devices Sink Capabilities. This would make it always go to a 9V contract with Choose Highest Voltage on your sink negotiation policy.

    Thank you,
    Eric
  • 0 in reply to Eric Beljaars
    TI__Expert 3190 points

    Eric,

    Thanks for your reply.

    Sure it would be a good way out, however in case I plug a 12v only charger  have no contract no more...

    It's still possible to make only 5,9,12,15,20V contracts however in case a 17V charger pops up one day we would like to keep the possibility to support it...

    But in case we have 9V available we would like to select it beyond the other possibilites.

    Thanks,

    Daniel

  • 0 in reply to Daniel Kociolek
    TI__Mastermind 36756 points
    Hi Daniel,

    A way to implement this would be to set your Sink Capabilities to always choose the 9V contract if it is available. To do this, you can set all of your other PDO to say 1-2A and then the 9V PDO to 3A. You can then set the sink negotiation policy to Choose Highest Current. This will make your device always sink 9V if there is a 9V PDO available.

    Thank you,
    Eric