• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 33 subscribers
  • Views 520 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SN65HVD232: ESD @Sn65hvd232 clarification Voltage levels

Marion Loessl
Expert 3260 points
Part Number: SN65HVD232
Other Parts Discussed in Thread: SN65HVD233, TCAN330

Hi,

a customer asked me whether the desired part SN65hvd232 would resist a +-30 volt levels transient as well as over a longer period.

These specs are off attention and I need some clarification here:

 "voltage at any bus level": is with this level meant, that the device can withstand (without damage) those levels over a certain duration?

the next spec "Voltage input, transient pulse": is this the max transient pulse over which duration that the device can take without damage?

so those questions just for me for clarification.

I already started searching for parts that are higher specified, for example SN65hvd233, which exceeds the +-30 V with the specs mentioned above.

The other device that I found was TCAN330, which also is IEC61000-4-2 specified.

Can I recommend one of those parts in regard of the voltage levels without ESD diode?

Is there another part I have missed, that you can recommend?

Did I understand the specs correctly?

Thank you very much for your help,

best regards,

Marion

  • 0
    TI__Expert 3260 points

    I just saw, that the picture of the max ratings for Sn65hvd232 was not included:

  • 0 in reply to Marion Loessl
    TI__Intellectual 2090 points
    Hi Marion,

    Thank you for your questions.

    The Voltage at any bus terminal specification is for long duration conditions. Keep in mind that this table is an absolute maximum ratings. Any operation above these specifications will degrade the reliability and/or functionality of the device.
    The Voltage input, transient pulse specification is pictured in Figure 24. The test applies a 15us, 1% duty cycle pulse through the 100ohm resistor onto the pus pins. Any pulse of longer duration or greater voltage magnitude will violate this spec.

    Therefore, it does not look like the SN65HVD232 will be able to withstand the customer requirement of +/- 30V on the bus pins.
    The TCAN330 is only rated to +/-14V, so I would not recommend this device either.

    The SNHVD233 will be able to meet this requirement, since its bus fault protection is rated at +/-36V. But keep in mind that the device will not be guaranteed to function at these voltages, since they are outside of the recommended operating range. The device simply will be able to withstand these voltages without damage.

    From my investigation, the SNHVD233, 234, and 235 part numbers offer +/- 36V bus fault protection for 3.3V CAN systems.

    Can you clarify what you mean by recommending one of the parts with regard to these voltage levels without an ESD diode? Are you looking for specific ESD requirements also? Or are you asking whether these bus fault voltage specs are independent of ESD conditions?

    Does this help? Please let me know if you have any further questions.

    Best Regards,
    Max Megee
  • 0 in reply to Max Megee
    TI__Expert 3260 points

    Hi Max,

    thank you for you quick answer.

    You helped me a lot with clarifying the specs.

    I gave that information to my customer, with the differentiation of the absolute and recommended ratings.

    Actually the customer asked already for an ESD diode and I addressed that with the PL, but there is not an appropriate device to recommend from their side.

    Thank you again, if other questions occur, I will open a new thread.

    Kind regards,

    Marion