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TPS25750: SourcePDO* GPIO events (#7~#13)

Andy Lin
Prodigy 60 points
Part Number: TPS25750
Other Parts Discussed in Thread: TPS25751

Tool/software:

Hi:

I'm currently evaluating a sink-only design without USB d+/d- and USB BC support. But I need some clarification regarding SourcePDO* GPIO events (#7~#13).

1. Are there any typos in these descriptions [a]?

2. What is the relationship between SourcePDO[4..1]Contract (#7–#10) and SourcePDOContractBit[2..0] (#11–#13)?

* For example, if PDO1 is the contracted one, would SourcePDO1Contract be asserted while SourcePDOContractBit[2..0] becomes {Deassert, Deassert, Assert} simultaneously? (Values shown as { SourcePDOContractBit2, SourcePDOContractBit1, SourcePDOContractBit0 }).

3. (Follow up of 2.) If the contracted PDO# is greater than #4, is it only represented in SourcePDOContractBit[2..0]?

4. Can SourcePDO[4..1]Contract (#7–#10) and/or SourcePDOContractBit[2..0] (#11–#13) serve as active indicators for a specific sink PDO to enable a system load [b]?

[a] TPS25750 TRM
[b] GPIO event for when specific sink PDO negotiated

Best regards.

  • 0
    TI__Mastermind 30112 points

    Hi, 

    TI U.S. is on Holiday today. Please expect some delay in responses. 

    Best Regards, 

    Aya Khedr 

  • 0
    TI__Mastermind 30112 points

    Hi Andy, 

    1. Thank you for highlighting these typos. Your understanding is correct. 

    2.  These GPIO events are typically used to enable the External DCDC output. The Source PDO Contract GPIOs (#7 - #10) are asserted high when a Source PDOx (x<= 4) has been negotiated, whereas the SourcePDOContractBit GPIOs (#11 - #13) use a binary encoded output to indicate when a Source PDOx has been negotiated (think of a truth table here). 

    3. Correct. For PDO # greater than 4, SourcePDOContractBit GPIOs should be used instead. 

    4. These GPIOs are asserted when the PD is behaving as a Source. They will not be asserted when the PD is behaving as a Sink. 

    I would also like to highlight our follow-on device, the TPS25751, recommended for new designs. Please see the following FAQ. 

    Best Regards, 

    Aya Khedr