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ISO1050: Question about Bus Fault Protection

Part Number: ISO1050
Other Parts Discussed in Thread: ISO1042

Hi team,

About the Bus Fault Protection spec. in our datasheet, it listed the spec. as below picture. It only indicated that the single ended voltage on CANH or CANL should be within -27V~40V. But is there any limitation for the differential voltage between CANH and CANL? Thanks.

Best regards,

Wayne

  • Hi Wayne,

    From what I understand there is no spec for CANH/CANL differential voltage defined but only the single-ended spec. This means that the worst-case voltage will occur when voltage at one pin is 40V with respect to GND2 while the other is at -27V with respect to GND2. In this case, the differential voltage is 67V. I believe this is okay.

    Please do allow me to double check this internally and then come back to you to confirm. Thanks.

    Regards,

    Koteshwar Rao

  • Hi Wayne,

    Apologies for the delay in my response. I did try to find this information for you, unfortunately, this particular spec is not defined for ISO1050 and we do not have any internal data to claim or guarantee any max spec for differential voltage on CANH/CANL lines especially for the reason that this is quite an old device. Hence, the 67V differential value I stated earlier is not valid.

    Since this parameter is clearly defined for ISO1042 and since ISO1042 is our latest reinforced isolation CAN transceiver with much better performance, could you please request customer to use ISO1042 in place of ISO1050?

    Let me know if you have any questions, thank you.

    Regards,
    Koteshwar Rao