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TPS65982/DPM

user1152997
Prodigy 80 points
Other Parts Discussed in Thread: TPS65982

Hi Team,

When use Tps65982 in a Source,  does it must need another MCU which do the USB PD's DPM function? 

Such as, the MCU control Tps65982 through I2C, indicating replay Accept or not when receive Request message from Sink.

Best Regards

  • 0
    TI__Expert 3625 points
    Hi,

    The TPS65982 has an integrated device policy manager (DPM) that handles the PD messaging and therefore an additional MCU is not needed to act as a DPM.

    Regards,
    Karl
  • 0 in reply to Karl Fleischmann
    Prodigy 80 points
    Hi,
    Thank you very much for reply.

    Does my understanding right or not?
    Because TPS65982 has integrated DPM, such as TPS65982 used in a notebook, if Power changed among Power Negotiation, the Host can not interfere the Power Negotiation immediately. Only after the Power Negotiation end, as Power changed, the Host starts a new Power Negotiation through "4CC Commands".
  • 0 in reply to user1152997
    TI__Mastermind 30310 points

    Technically, there is an option to control the PD Contracts through a host processor, using PDO/RDO Intrusive Mode.

    It is an option to select in the Control Config section of the TPS65982-CONFIG Config Tool. Even in Intrusive Mode, the integrated DPM (Device Policy Manager) still automatically ensures to PD Protocol is followed and has some advantages over a solution that is purely defined by  MCU code.

    However, the PDO/RDO Intrusive Modes are rarely used because of all the options we have for automatically negotiating Sink PDOs (Sink Capabilities) and Source PDOs (Source Capabilities) in the Config Tool.

    Typically, an MCU will only need to get involved in 2 port systems with very complex power circuitry.