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DS90UB953-Q1: LPF1 Cap Connected to VDDPLL_CAP

PY (Pengyu) Song
Expert 5860 points
Part Number: DS90UB953-Q1

Hi team,

Customer has accidently connect LPF1 cap to VDDPLL_CAP pin instead of VDDPLL pin - it is late to change design and hard to re-wire. Design will be corrected in the next phase but key question is will below connection still work functionally on the existing board? 

  • +1
    TI__Guru** 108100 points

    Hello PY,

    This LFP pin during operation will have a range of 0-1.8V depending on voltage and temp change. If this is not maintained, which will be the case on your design, you may see stability problem for either FPD-Link output or CSI-2 inputs. It is not easy to exactly predict what is going to happen since this is not a valid use case and was not tested in this form.