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TPS659037: TPS6590376ZWSR - sequencing issue

Viktorija Cecil
Genius 17961 points
Part Number: TPS659037
Other Parts Discussed in Thread: AM5728

Team, 

My customer is using our AM5728 and TPS6590376ZWSR. They are running into some issues:

We believe we may have an issue with the PMU in our design.  The issue lies in the power up sequence and we are wondering what the effect is on the ARM processor.  The following lines according to 5-1 Power up sequencing has VDDSSHV1, VDDSHV2, VDDSHV3, VDDSHV4, VDDSHV5, VDDSHV6, VDDSHV7, VDDSHV9, VDDSHV10 and VDDSHV11 coming up later where we have them coming up ahead of all other lines.   Are you able to confirm if this is in any way damaging the ARM processor.  We do see the initial power up of the processor and while trying to boot from an SD card the processor is optimizing for the clock frequency but it seems to hang after this point.  Is this a result of the bad power up sequence…….

Thanks

Viktorija

  • 0
    TI__Genius 16030 points
    Hi Viktorija,

    If you look at note 6, it states that if VDDSHV1-7,9-11 are are only used at 1.8V, then they can come up with VDDS18V in the early slot. This means they can be powered by SMPS8. If they are used at 3.3V, then they should be sequenced in the later slot - REGEN1 is used to enable the 3.3V rail in this later slot.

    If the above conditions are being met, then I don't see any sequencing issue. But if you are using the VDDSHVx rails at 3.3V and they are being sequenced early, that looks like a violation and could cause processor issues.

    Regards,
    Karl