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Original question:

SN65HVD251-Q1: what's the Vref function and how to use it?

SN65HVD251-Q1: certificate for conformance test plan ISO 16845

Raphael Vanstraelen1
Prodigy 70 points

Part Number: SN65HVD251-Q1
Other Parts Discussed in Thread: SN65HVD251

Can you provide a certificate that indicates  that the  SN65HVD251 is  conform to  the test plan of ISO16845? My customer needs this document before we can use this component in our ECU.

  • 0
    TI__Guru* 75282 points

    Raphael,

    Typically, C&S tests for conformance for CAN products, and we have certificates from them available for our CAN transceivers. However, the SN65HVD251 is a relatively old 5V CAN transceiver. When this device was created, only the industrial market was targeted so automotive conformance wasn't necessary, and so we don't have a certificate that states we conform to this standard. 

    That being said, all of the electrical and timing characteristics in the datasheet follow the CAN standard, and we have plenty of customers using this device with no problems. If you absolutely need a certificate, we have them available for our other 5V CAN transceivers. Is there a reason you went with the SN65HVD251?

    Regards,

  • 0 in reply to Eric Hackett
    Prodigy 70 points

    Hello Eric,

    We also used this component already a long time on other ECUs and never received any complains about it.

    Therefore we are using this device on our latest ECU design and up till now mainly used it for off-highway application.  Our ECU controls a gear box for heavy duty vehicles.

    We recently started a project with a large OEM that is also active in light and commercial vehicles. The OEM asks now a device that complies with ISO 16845.

    We can consider to use a device that is certified.

    Can you  propose a device (certificate required) that is pin compatible and that is compliant to ISO16845?

     

    Thanks in advance

    Raphael Vanstraelen

  • 0 in reply to Raphael Vanstraelen1
    TI__Guru* 75282 points

    Raphael,

    Oh okay, that makes sense, thanks for the clarification.

    One device that would work is the TCAN1042, the only change is that pin 5 will no longer be a voltage reference output for the common-mode stabilization. The main reason that the Vref voltage is there is to stabilize the common mode of the CAN bus, which helps with the RF emissions performance of the transceiver. The reason this is left out of the TCAN1042 is because it was designed with EMC performance in mind. The symmetry of the CAN bus drivers was optimized, and was found that the TCAN1042 passed emissions certifications test without the Vref output. On the TCAN1042, this is a no connect.

    Please let me know if you have any other questions.

    Regards,