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SN65HVD230: What's the ESD rating of Vref pin?

user5083091
Prodigy 80 points
Part Number: SN65HVD230

Hi team,

I'm using our SN65HVD230 to design a ADAS product. I'd like to use the Vref pin to stabilize the common mode voltage. Our product has strict limit on ESD ratings. We have to pass 15kV ESD test. I just wonder if i attach the Vref pin to the split termination resistor, will the ESD rating be degraded?

I can see from the datasheet that the rating for the CANH and CANL pin is 15kV but all other pins(including Vref pin) are 4kV. 

Thanks.

Best regards.

  • 0
    TI__Guru 62920 points
    Hello,

    The VREF pin is "weaker" than the CANH and CANL pins (as you pointed out via the ESD specifications), although the stresses it endures in a system-level test are typically lesser. ESD strikes would typically be applied to the CAN pins, and the split termination network would act as an R/C filter that would attenuate the high-frequency transient. Although we only provide a pin-level spec on this device, it is probably worth evaluating in your system with the 15-kV stress. To be conservative, you may want to include the ability to disconnect the VREF pin from the split termination network via a 0-Ohm resistor or the ability to install transient voltage suppression (TVS) diodes on the CANH/CANL lines.

    By the way, the 16 kV spec on CANH and CANL is for human-body-model stresses. If your test is per a different standard (e.g., IEC 61000-4-2) you may need to provide external protection via TVS diodes in order to pass. Different ESD discharge models can give substantially different levels of energy transfer, even at equal voltage amplitudes.

    I hope this helps; please let me know if you have further questions.

    Regards,
    Max