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SN65HVD1050: Sampling rate lower limit of CAN bus transceiver

Xiaoying Lu
Expert 4340 points
Part Number: SN65HVD1050


Hi,

My customer has a question regarding the max and min signaling rate limitation of CAN bus transceiver.

For example, the recommended signaling rate for SN65HVD1050 is 20kbps to 1Mbps. Actually my customer is curious why there is a lower limit for signaling rate, and what structure or principle of the device determines this characteristic.

Sometimes, the end equipment does not require 20k communication speed, for example, they only require 5k. Is there any risk to use only 5k sampling rate? Thanks.

Regards,

Xiaoying Lu

  • 0
    TI__Guru 74322 points

    Xiaoying,

    What limits this is the dominant timeout feature on the CAN transceiver which limits the amount of time the bus driver can be in the dominant state. Along with this, in the CAN protocol there's a possibility of 17 dominant bits in a row in the case of an error state, so the formula to find out the minimum data rate is 17 / tTXD_DTO. This puts the minimum data rate at ~24kbps.

    Please let me know if you have any other questions.

    Regards,

    Eric Hackett