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TPS65381A-Q1: how to enter active state from safe state after programming

Miranda Gu
Genius 16632 points
Part Number: TPS65381A-Q1

Hi team,

My customer have below question on TPS65381A-Q1, appreciate your support.

  • After they programmed the device, but didn't have power cycle (power off then on), how to enter active state from safe state?
  • 0
    TI__Expert 4980 points

    Hi Miranda,

    This device can't directly go from the safe state to the active state. It needs to go reset state → Diagnostic State → Active State. Here is the state diagram of the device to better illustrate what I am talking about.

     

    There are more recent devices that can go from safe to active but not this one.

    Best,

    Michael Hernandez

  • 0 in reply to Michael Hernandez
    TI__Genius 16632 points

    Hello Michael,

    Thanks for your feedback! My customers have below additional questions.

    1. The condition is the device just finished programming by external tool. The device cannot go reset state → Diagnostic State → Active State flow because the code hasn't started to run inside the device. So customers think they cannot use this method.

    2. Does the device support firmware programming at active mode, instead of safe mode? 

    3. If above two methods cannot use, the only method is that customer must power cycle (off/on) the device after programming, right?

    4. Eco to your words, customers also see other PMIC doesn't need power cycle after programming. Just to check, how about tps653851 (next-gen of tps65381)? Does it need power cycle after programming?

  • 0 in reply to Miranda Gu
    TI__Expert 4980 points

    Hi Miranda,

    This device is configured in the diagnostic state not in safe state. The device can be programmed in the diagnostic state then be moved to the active state. I'm not entirely sure if thei will work for the customer because sometimes customers will push an update that requires the PMIC to act slightly differently thus requiring a reprogram which for this device would pull NRES low thus telling the MCU to reboot. From what I understand the regulated outputs can be configured to stay on while in in the reset state if the device didn't go into the standby state. To answer your final question the TPS653850A can go from safe to active while bypassing the reset state. Be sure that is an NDA in place before so many details are shared about that device.

    Best,

    Michael Hernandez