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TPS65311-Q1: Alternative transition's to LPM0 not using a SPI command?

Julio Apps
Expert 3665 points
Part Number: TPS65311-Q1
Other Parts Discussed in Thread: TCAN1043

Team,

What is the recommend way to trasition the TPS65311 into the LMP0 mode without having to write to it over SPI? We are attempting to use the inhibit pin of the tcan1043 to shut down the PMIC. I see i can introduce a WD reset to increment the error counter to eventually transition to LMP0 after 7 counts. Is this a viable solution?

  • 0
    TI__Genius 17380 points
    Hi Julio,

    The only recommended way to enter LPM0 based on the datasheet section 8.3.10 is through SPI; however you are right that if the error counter (EC) reaches number of consecutive reset events for transfer to LPM0 (Nres = 7) then it will transition to LPM0.

    I've looped in our expert as well but he is out of office at the moment. I think the biggest drawback to this approach is that it may be hard to distinguish between an intentional transition to LPM0 and a transition due to an error since in both cases EC_OF will be set. As long as this is not a problem, I don't see any major disadvantages.
  • 0 in reply to Kevin LaRosa
    TI__Expert 8730 points

    Hi Julio,

    As Kevin mentioned, only clean way to enter LPM0 mode is through SPI command. Using watchdog (WD) pulse disable option will take ~ 2 seconds for device to go to LPM0 mode after WD signal is removed and i think this is pretty long. Also this approach results in EC_OF to be set. But if this is acceptable to customer, this could be another option.

    Regards,

    Murthy

  • 0 in reply to Krishnamurthy Hegde
    Prodigy 10 points
    Hi,

    I don't like the watchdog option. Is there other way using VIN,VIN_PROT or VSENSE pins to de-power the PMIC, or to keep in Low power Mode.
  • 0 in reply to Ramesh Kattamuri
    TI__Genius 17380 points
    Hi Ramesh,

    I know Murthy was working with Julio via email, if you have further questions please let us know.