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ESD2CAN24-Q1: ESD2CAN24 used for CANHS and CANFD

Daniel Wang (auto)
Expert 4280 points

Part Number: ESD2CAN24-Q1
Other Parts Discussed in Thread: ESD2CANFD24-Q1, ESD2CAN36-Q1, TSM24CA-Q1

Tool/software:

Hello team,

There is a failure under BCI 300mA for ESD2CANFD24-Q1, customer found ESD2CAN24-Q1 can understand higher current and power, so they want to know if ESD2CAN24-Q1 can both CANHS and CANFD?

Thanks

Regards,

Daniel Wang

  • 0
    TI__Mastermind 21640 points

    Hi Daniel,

    The capacitance of ESD2CAN24-Q1 is low enough to support CANFD and even higher speed protocols so no concerns there.

    From my understanding, during a BCI test you're forcing current onto the wiring harness which will induce a voltage on the CANH/L lines. At 300mA this voltage could be above the breakdown voltage of the diode and cause it to clamp, which could cause an error in communication. 

    Can you specify what the customer classifies as a failure for this BCI test?

    Is there a failure in communication at a certain frequency? Or the ESD diode is being damaged?

    Best regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    TI__Expert 4280 points

    Hello Sebastian,

    Thank you for your support. Here are some update from customer:

    The BCI test parameters and requirement shown as below:

    We did the test level3 first for three samples.

    Sample 1: PASS

    Sample 2: After testing, it was found that the diode's resistance to ground decreased. It was originally in the megaohm range (MΩ), but dropped to the kiloohm range (kΩ).

    Sample 3: After testing, one path of the diode showed reduced resistance to ground, while the other path was already shorted to ground.

    We suspect that the diodes originally used might have been in a borderline state,
    So, we’re considering replacing them with higher-power diodes for testing.
    Do you have any suggestions?

    Regards,

    Daniel

  • 0 in reply to Daniel Wang (auto)
    TI__Mastermind 21640 points

    Hi Daniel,

    Apologies for the delay the forums were down for maintenance. 

    From my understanding of BCI, you wouldn't want the ESD diode to turn on to avoid communication errors. If they use a diode with a higher working voltage like ESD2CAN36-Q1, they could avoid the diode turning on during the BCI test. 

    If they really want to opt for a higher power diode, they can use something like TSM24CA-Q1.

    Regards,

    Sebastian