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TCAN1057A-Q1: Need an advice for caring EMC

Atsushi Hirai
Expert 3630 points
Part Number: TCAN1057A-Q1

Hi team,

My customer will use TCAN1057 for 1Mbps UART communication BUS. This BUS has 2 follower nodes and the each harness length is around 6m on star connection.

My customer want out advice what EMC caring should be done. Could you list up general EMC caring(use shielded/unshielded twisted cable, use low capacitance and high voltage ESD protection) with "Must" or "Recommended"?

Must

-

-

Recommended

-

-

Best Regards,

  • +1
    TI__Mastermind 48215 points

    Hi Atsushi-san,

    Is there a particular EMC qualification the customer is interested in? If so, please check the sharepoint for EMC test reports for this device. Some reports also include test data that might be of interest to the customer. For instance the Zwickau report has plots showing performance both with and without a common-mode choke (CMC). 

    For general good EMC practice, you have already listed some. Shielded cabling will help reduce noise coupling into or out of the system. Common-mode chokes (CMCs) are also common components to reduce emissions. These devices filter out common mode frequencies from the CAN driver before they make it on to the cable harness. Similarly, using split termination (DS figure 9-2) also helps filter common mode noise. Lastly, ensuring that CANH and CANL are routed as differential signals with parallel traces of the same length helps reduce asymmetry in the CAN signals, which may impact emissions. These are very helpful and are very good recommendations for any system with EMC concerns. 

    Less impactful but still helpful practices include additional bus capacitors on CANH and CANL (to ground) to slow signal edges, impedance matching signal traces to that of the cable harness, and ensuring the power supply input to the transceiver is nice and clean. 

    It is difficult to create a "must" and "recommended" category because the requirements for each system may be different. Some systems may require extra measures to ensure good EMC, while other may not. That said, I hope the two paragraphs above make it clear which practices are the most impactful. 

    Let me know if you have any more questions.

    Regards,
    Eric Schott