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UCD90320: Power Down Sequence adjusting fail

Kevin Cho
Prodigy 70 points
Part Number: UCD90320

Tool/software:

Hi,

We tried adjusting the power-down sequence for Rail#17 to make it power down after Rail#24.
But no matter what I do, it's not working.
Could you please help check which steps were wrong?

Setting SOP:

UCD90320 3.0.0.3330 Address 17 Project File_20240909.xml

  • +1
    TI__Expert 4335 points

    Hi,

    According to your project file, the enable signal Rail #17 does not come from the UCD90320. In this setup the UCD90320 can monitor the rail voltage, but not control turning the rail on or off.

    As such Rail #17 will power down when it's external enable signal goes low, regardless of what the UCD90320 is doing.

    If you want Rail #17 to power down after Rail #24, the external enable will need to be tied to Rail #24 in some way, or the enable will need be provided by the UCD90320.

    Regards,

    Troy