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Original question:

TDA4VM-Q1: Analog supply filtering of unused subsystems

TDA4VM-Q1: Decoupling capacitors on unused VDDS_MMC0

Peter Fritzenschaft
Prodigy 226 points
Part Number: TDA4VM-Q1

Hello,

AM6x/DRA8x/TDA4x Schematic Checklist Tool recommends to follow EVM decoupling strategy, which uses 2x100nF and 2x1uF for VDDS_MMC0 (PROC078 001 J721EXSOMG01EVM rev A).

Can the amount of capacitors be reduced when no MMC0 interface is used?

Regards, Peter

  • +1
    TI__Expert 4675 points

    Yes, recommended decoupling can be reduced since that interface is not being used. Keeping 1x 0.1uF Dcap at power pin would be good practice. Please be aware any unused interface still needs a correct supply voltage applied.  This can be supported by combining it with a like voltage supply.