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TPS6594-Q1: nRSTOUT and PMIC suspended on AM69 custom board design

Jack Cha
Mastermind 8366 points
Part Number: TPS6594-Q1
Other Parts Discussed in Thread: AM69

Tool/software:

Hi TPS6594 champ !

My customer found 2 issues regarding TPS6594 and AM69 based custom board design.

1. PMIC Off issue after 3hours 20mins

I am contacting you because I noticed that all the PMICs power off about 3 hours and 20 minutes after system power up.
Forcing the PMIC enable pin to be adjusted did not resolve the issue, what can I do to prevent this from happening after 3 hours and 20 minutes?

2. nRSTOUT to SOC after 13mins

About 13 minutes after power-on, a LOW signal is output from nRSTOUT of PMIC 25pin and AM69 is reset.
Please tell me how to prevent nRSTOUT from outputting Low after 13 minutes.

Thanks.

Best Regards, 

Jack 

  • 0
    TI__Mastermind 23055 points

    From your description, the Watchdog of the PMIC is enabled by default. Every 13mins the Watchdog Long Window times out and cause a Warm Reset (short toggle low of nRSTOUT and nRSTOUT_SOC). After 15 Warm Resets, if the recovery counter isn't cleared, the PMIC will power down and stay shutdown until VCCA input is power cycled. 

    Jack Cha said:
    Forcing the PMIC enable pin to be adjusted did not resolve the issue, what can I do to prevent this from happening after 3 hours and 20 minutes?
    Jack Cha said:
    Please tell me how to prevent nRSTOUT from outputting Low after 13 minutes.

    To prevent these thing from happening, there are 2 simple software options:

    Option 1:  During the first 13 minute window, write 0 to WD_EN bit.

    Option 2: During the first 13 minute window, write 1 to the WD_PWRHOLD bit.