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TPS65988DJ: TPS65988DJ two port application

John Liu59
Intellectual 2735 points
Part Number: TPS65988DJ


Dear all,

In my customer application, there are two full function ports, so TPS65988DJ is chose for the design.

Here is one scenario need to be considered when two ports are inserted power, how to determine which is will be used?

and How to set in FW in this application considering two power input simultaneously?

Thanks.

  • 0
    TI__Mastermind 36756 points

    Hi John,

    You can select the behavior you are wanting in the Global System Configuration register (0x27) under the MultiPort Sink Policy field. You can choose to allow only the highest power sink to close the sink power path in this register. There are more details on page 29 of the following document: http://www.ti.com/lit/ug/slvubh2b/slvubh2b.pdf

    Thank you,
    Eric

  • 0 in reply to Eric Beljaars
    TI__Intellectual 2735 points

    Hi Eric,

    From the materials, for multi port sink policy, if set to 00 which means no sink management, what will be happen when insert two power into each port？

    Also, if customer want to use the power from the port which firstly inserted, and ignore the second source inserted , how to set it  in the FW?

    Also for the multiport source policy, if set to 1, what is the meaning of "only one port may source more than USB default"?

  • 0 in reply to John Liu59
    TI__Mastermind 36756 points

    Hi John,

    If multiport sink policy is disabled, then both sink paths will be enabled if two PD Sources are attached. 

    The customer would need to handle the power paths through the EC if they want to only close the power path for the first connected source. They can do so by configuring the Sink paths to wait for SRDY in the Global Sys Config register (0x27). They can then send the SRDY command to control when the Sink paths are enabled.

    For Multiport Source Policy, if the first port is attached and become a source of more than default USB current (greater than 5V/900mA), then if the second port becomes attached as a source, it will be limited to 5V/900mA.

    Thank you,
    Eric

  • 0 in reply to Eric Beljaars
    TI__Intellectual 2735 points

    Hi Eric,

    Thanks for your reply.

    If both the sink paths are enabled with two different PD source voltage, then one path will be in protection, only the higher output path will provide power the the system, am i right?

    besides, i don' t find the SRDY setting in the Globbal sys config register items, could you please help check where it is?

    Thanks.

  • 0 in reply to John Liu59
    TI__Mastermind 36756 points

    Hi John,

    If you will be enabling both source paths with different PD source voltages, then you need to add external RCP circuitry. Otherwise, one PD adapter will feed reverse current into the other one. 

    Both PP3 and PP4 can be configured as "Sink, wait for SRDY" in Global System Configuration. It can be found under the PP3 config and PP4 config.

    This means that the power path would not turn on unless the SRDY 4CC command is sent by the EC.

    Thank you,
    Eric