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TCAN1044AV-Q1: TCAN1044AV-Q1 EMC optimization

Manu Chang
Intellectual 1990 points

Part Number: TCAN1044AV-Q1

Hi Team,

My customers are using TCAN1044AV-Q1 in their projects and facing some issue when doing the EMI/EMC tests. As you can see during the radiation test the results on 30MHz and around 90MHz is a little bit higher. 

For the EMC performance, TI's device test result is worse than competitor's SIT device according to customers.

The test results, schematic and layout are shown as in below, can you give some advices on EMC optimization regarding customers' design? That would be helpful to customers.

BR,

Manu

  • 0
    TI__Mastermind 27780 points

    Hi Manu,

    The CMC will generally reduce emissions in differential signaling systems, so this is expected. Zwickau does test both with and without a CMC bus filter. But the test without CMC is just for informational purposes, the certification is always done with a CMC.

    https://sps16.itg.ti.com/sites/trx/TRXField/SiteAssets/Forms/AllItems.aspx?RootFolder=%2Fsites%2Ftrx%2FTRXField%2FSiteAssets%2FProduct%20Information%2FCAN%2F2%20%2D%20Product%20Information%20%2DRTM%2FTCAN1044A%28V%29%2DQ1%20and%20TCAN1057A%28V%29%2DQ1%2FEMC%20Test%20Reports%2FIBEE%20Zwickau&FolderCTID=0x0120004E8C1FF9489EB041AF88D50864EA0D5A&View=%7B51BFE40F%2D3EBF%2D4E00%2D8F73%2DECC6B04C2140%7D

    Regards,

    Sean

  • 0 in reply to Sean Guo
    TI__Intellectual 1990 points

    Hi Sean,

    Thanks for your rapid reply.

    Sorry that I am not very certain about your advices. Your suggestion is to add the CMC L600 instead of the R601 and R602, right? Pls correct me if I understood this wrongly.

    Are there any other suggestions regarding customers schematic and layout?

    BR,

    Manu

  • 0 in reply to Manu Chang
    TI__Mastermind 27780 points

    Hi Manu,

    Yes, their CMC L600 is NC. We recommend to put a 51~100 uH CMC for most CAN applications. The other parts on schematic and layout look good to me.

    Please let me know the test results with CMC.

    Regards,

    Sean