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TPS65721: Resetting IC

JoFu10
Intellectual 2385 points
Part Number: TPS65721

Hi,

What is the best way to reset the IC in case of lockup? Pushing the PB_IN will disable the LDO and DCDC, but is there any way to reset the charger portion or IC?

Thanks,

Josh

  • 0
    TI__Mastermind 30280 points

    Josh,

    Can you define the meaning of "lock-up" in your case?

    If a UVLO condition occurs on AC/USB pins, LDO & DCDC will be disabled already. Using the PB_IN (push-button) to restart the device is the only way to bring up all of the rails again after this type of "lock-up".

    But it sounds like your problem may be different than AC/USB drop-out, and the solution may require a better understanding of the system. A definition of the "lock-up" you observe will be a good start, and scope shots are always appreciated.

    In addition, if you can read the Register Map via I2C, it would also help if you can do a register map read and attach the data dump as a .txt file in this thread.

    Thanks,

    Brian

  • 0 in reply to Brian Berner
    TI__Intellectual 2385 points
    Hi Brian,

    By lockup I mean if the device freezes and becomes not responsive. Does using the push button restart the entire device, or simply re-enable the DCDC and LDO?

    We haven't had any issues yet, but they would like the reset feature.

    thanks,
    Josh
  • 0 in reply to JoFu10
    TI__Intellectual 1360 points
    Josh,

    Push button logic will restart only DCDC and LDO. There is no reset feature for charger.

    Jay
  • 0 in reply to Jayanth Kruttiventi
    TI__Mastermind 30280 points

    Josh,

    Jay is correct, but I will elaborate on my understanding of the issue:

    The push-button will allow the LDO & DC-DC to come up after a UVLO condition has occurred.

    If you are experience "device lock-up" as you have described, the part has experienced a UVLO condition. It is operational, but it requires a push-button press to resume normal operation. It is essentially coming out of the "OFF" state again, and this transition requires the push-button press (i.e. PB logic transitions to low active-state).