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Original question:

AM3358: VDDS_PLL_MPU and VDDS_PLL_DDR

AM3358: AM3358

Roberto del cano48
Prodigy 90 points
Part Number: AM3358

Hello everyone-

I am doing a FMEA on a design based on AM3358(BZCZA100) micro controller-I have two failure modes I would like to double check:

1.Would the AM3358(BZCZA100) stop operating normally if pin CAP_VBB_MPU is gets open circuit?

Datasheet suggests it is a redundant power source for the internal MPU_SRAM_LDO, would it that be right? 

So I am also assuming any external stuck high to a 3V3 source or low to GND that would damage the internal MPU SRAM- would you agree?

Any advise/comments very appreciated.


Thanks in advance


Roberto

  • 0
    TI__Guru**** 393215 points

    Hi,

    Roberto del cano48 said:
    1.Would the AM3358(BZCZA100) stop operating normally if pin CAP_VBB_MPU is gets open circuit?

    Yes.

    Roberto del cano48 said:
    Datasheet suggests it is a redundant power source for the internal MPU_SRAM_LDO, would it that be right? 

    No, this is the internal LDO output capacitor connection pin.

    Roberto del cano48 said:
    So I am also assuming any external stuck high to a 3V3 source or low to GND that would damage the internal MPU SRAM- would you agree?

    Yes.