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Original question:

[FAQ] Multiphase FAQ & Answers - TPS53647, TPS53667, TPS53681

PMBus or pin strap

Yuto Sakai
Mastermind 6100 points
Other Parts Discussed in Thread: TPS53667

Hi,

I have a question about TPS53667.
I understand that the number of phases to use can be set with CSP pin, Iout and V3R3.
Which setting will be given priority when setting with PMBus and setting by pin?
Or should it be set with both pin and PMBus?

Best regards,
Yuto Sakai

  • 0
    TI__Expert 5965 points
    Hi Yuto,

    The pin will set the maximum phase number, and then with PMBus you can reduce the phase number from there. So pin has higher priority.

    Regards,
    Weidong
  • 0 in reply to Weidong Zhu
    Mastermind 6100 points

    Hi Weidong-san,

    Thank you for your reply.
    I understand that the setting of the pin has priority.
    What happens if I set it as 5 Phase or 6 Phase with MFR_SPECIFIC_ 20 during operation after setting it as 4 Phase on pin?
    Does this register automatically operate after reading the initial setting at pin first?

    Best regard,
    Yuto Sakai

  • 0 in reply to Yuto Sakai
    TI__Expert 5965 points
    Hi Yuto,

    If you set to 5 or 6 phase with MFR_SPECIFIC_20 after setting to 4-phase on pin strap, then it will operate at 4-phase only. Only if you set MFR_SPECIFIC_20 to lower than 4 phase it will have impact.

    Regards,
    Weidong
  • 0 in reply to Weidong Zhu
    Mastermind 6100 points

    Hi Weidong-san,

    Sorry for asking so many questions.
    In the description of MFR_SPECIFIC_20, it is described as follows.

    "If the maximum operational phase number is set higher than the
    available phase numbers specified by hardware, then the operational phase
    number remains unchanged, and the STAUTS_MFR_SPECIFIC <3> is set while
    asserting PMB_ALERT.

    Does this output a fault signal when PMBus sets the operation with more phases than the pin setting?

    Best regards,
    Yuto Sakai

  • 0 in reply to Yuto Sakai
    TI__Expert 5965 points
    Hi Yuto,

    In this case, it will not cause fault. The only thing is STAUTS_MFR_SPECIFIC <3> will set and PMB_ALERT will be pulled low.

    Regards,
    Weidong