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Linux/AM3352: About the leakage issue

yimin bai34
Genius 4755 points
Part Number: AM3352
Other Parts Discussed in Thread: TPS65910,

Tool/software: Linux

Hi SIr 

We used AM3352 with TPS65910 for design. and We found the residual voltage coming from CPU before booting

After investigating, we found we offered 5VSTB voltage to PHY first before PMIC power-on. And we measured the VMMC pin of PMIC was about 1.4V.

if we remove 5VSTB or L102 as below , the VMMC pin is 0v before PMIC power-on.

Q1: Could TIer advise for susceptibility of AM335x for residual voltage as observed 

Q2: Does CPU have any risk for this or other suggestion.

BR

Yimin

  • 0
    TI__Guru**** 393215 points
    Hi,

    AM335x IO pins are not fail-safe and no external voltage should be presented to them before all processor power supplies have fully ramped-up and stabilized. See section 5.1 in the AM335x Datasheet Rev. J for details. Look at parameter "Steady state max voltage at all IO pins" and Note 8 below the table.