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TCAN1042-Q1: Datasheet spec clarification

Viktorija Cecil
Mastermind 18501 points

Part Number: TCAN1042-Q1

Does TCAN1042-Q1 support the 500 and 1Mbps CAN traffic? The data sheet specifies the following on the first page:

  • “All Devices Support Classic CAN and 2 Mbps CAN FD (Flexible Data Rate) and "G" Options Support 5 Mbps”

However, page 16 leads me to believe that it may not support the 500 rate:

  • “These CAN transceivers meet the ISO11898-2 (2016) High Speed CAN (Controller Area Network) physical layer standard. They are designed for data rates in excess of 1 Mbps for CAN FD and enhanced timing margin / higher data rates in long and highly-loaded networks.”

Can you please clarify?

Thanks

Viktorija

  • 0
    TI__Guru 74542 points
    Viktorija,

    The TCAN1042 can support date rates down to 250kbps, all the way up to 5Mbps (depending on the version of the device, as you stated). Classic CAN operation implies data rates from 250kbps to 1Mbps. I agree that the statement "They are designed for data rates in excess of 1Mbps..." can be interpreted to mean that they don't work well for lower data rates, but that is not the case.

    Please let me know if you have any other questions or concerns.

    Regards,
  • 0 in reply to Eric Hackett
    TI__Guru 62920 points
    Viktorija,

    I just wanted to add on to this that rates even lower than 250 kbps are OK as well. The minimum data rate (maximum bit duration) would be limited only by the dominant timeout function, which switches the output state to recessive whenever the TXD line is low for longer than the specified timeout period. In the case of TCAN1042-Q1, the minimum timeout period is 1.2 ms and the maximum number of consecutive dominant bits per the CAN protocol standard would be 11 (five dominant bits immediately followed by an error frame); this means that the minimum operating rate would be 11 / 1.2 ms or about 9.2 kbps.

    Max