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TPS2547: Regarding the difference in iPhone behavior between SDP1 and DCP on TPS2547.

Bruce Dai
Intellectual 620 points
Part Number: TPS2547

Tool/software:

Hi AE,

       Currently, The Type-C port with BC1.2 via TPS2547 and the CC pins handled by a CC controller for Type-C protocol.

       We support 5V3A

       Current testing on the iPhone 15 shows different results between DCP and SDP1 as follows.

       1.  If both SDP1 and DCP are present with DM/DP and CC1/CC2 connected, which protocol will iPhone 15 follow?

       2.  When the phone is in DCP mode, it intermittently stops charging, and a PD hard reset is observed.

Best Regards

  • 0
    TI__Mastermind 37855 points

    Hi Bruce,

    Bruce Dai said:
       1.  If both SDP1 and DCP are present with DM/DP and CC1/CC2 connected, which protocol will iPhone 15 follow?

    I do not know, for BC1.2, the device (the Iphone in this case) drives the detection, so it is up to it to determine which protocol to follow. I would assume it would attempt the higher power one (DCP), but cannot say for sure as it is up to the Iphone to decide.

    Bruce Dai said:
    2.  When the phone is in DCP mode, it intermittently stops charging, and a PD hard reset is observed.

    Do you see the voltage drop or current surge? I'm assuming the fault pin goes low?

    Thanks and Regards,

    Chris