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ISOW7841: ISOW7841 EMI issue

Genius 4975 points

Replies: 14

Views: 1112

Part Number: ISOW7841

Hi Sir,

Our customer used the ISOW7841, But EMI report Fail.

Could you please support for Review Layout?

or based on EMI report Could you please provide the suggest for me?

Hugo

108-01-31-M1923.pdf

  • In reply to Hugo Liu:

    Hi Hugo,

    The two implementations that you have shown are valid and produce the same capacitance value as the overlap area (A), the spacing between layers (d) and the dielectric material are still going to be the same. It is fine to use either of the options. Thanks.


    Regards,
    Koteshwar Rao
  • In reply to Hugo Liu:

    Hi Sir,

    If our customer two COM Port use one common VCC  similar red area, two COM Port use one common GND similar green area to get more Ci>50pf.

    That mean no shielding between COM2 & COM3. any risk? we can do that ?

    Hugo

  • In reply to Hugo Liu:

    Hi Hugo,

    If customer board has common VCC & GND for two COM ports (COM2 & COM3) and decides to use a bigger common area to create >50pF then yes this should cover all the devices in COM2 & COM3 and these two ports might not need a separate individual stitching caps.
    If COM1 is not sharing VCC & GND with COM2 or COM3 then COM1 will need a separate stitching cap with value >50pF>

    Does this answer your question? Thanks.


    Regards,
    Koteshwar Rao
  • In reply to Koteshwar Rao:

    Hi Sir,

    Thanks for your grent support,

    Hugo

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