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Original question:

AM57x short on 3 power supply rails

TPS659039-Q1: Power domain of TPS659039

user3378603
Intellectual 1000 points
Part Number: TPS659039-Q1

Hi，

Regarding the application of PMIC, there are two questions:

Q1： One SMPS output of the PMIC is shorted for a few seconds, and it is measured that the SMPS has no output. At this time, we cannot reset the PMIC through POWERHOLD . Because the SOC cannot work, Soc cannot read the PMIC register through I2C. Is it necessary to power off and power on the PMIC to reset the PMIC? Is there any other way to reset the PMIC with constant power?

Q2：The NRESWARM pin of PMIC is used for Warm Reset. In what scenarios can we not use this pin? For example we don't have RTC function

  • 0
    TI__Genius 10000 points

    Hi,

    If a rail is shorted, you either need a POR (turn the device off then on again) or use I2C to clear the short-circuit interrupt (which you indicated may not be an option for your system if the processor can't communicate to the PMIC).

    The NRESWARM is a digital input signal on the VRTC domain. The VRTC is an internal power supply (LDOVRTC) which will always be available. As long as the input signal used is at a maximum voltage of 1.8V, you can use this signal to intiate a warm reset when needed in your system.

    Thanks,

    Nastasha

  • 0 in reply to Nastasha
    Intellectual 1000 points

    Hi，Nastasha

    So when a rail of  PMIC is shorted, it's useless to perform Warm Reset or RESET_IN on PMIC alone, right?

  • 0 in reply to user3378603
    TI__Genius 10000 points

    Hi,

    Yes you are correct. You will need a full power on reset (POR).

    Thanks,

    Nastasha