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CAN 3.3V FD and Activity Detection

Antonio Faggio
Expert 7230 points
Other Parts Discussed in Thread: SN65HVD234, TCAN334, SN65HVD234-Q1

Hi All,

In our product we need a CAN trx and we have inserted the TI SN65HVD234D trx.

The first question is: is the component compatible with CAN FD? Actually I would need to understand if the tranceiver, unless the maximum working speed, is transparent from the point of view of the CAN protocol?

I should also add the device wake-up feature from CAN (activity only and not by specific message).

I evaluated other trx, but I did not find a 3.3V wake-up component. There would be the possibility to keep the SN65HVD234D component in stand-by mode, taking advantage of the message received. The problem arises from the current in stand-by mode, which can reach 600uA: I need to stay below 100uA.

I am also evaluating the identification of can trx via discrete, do you have any application notes or schematics to obtain this functionality?

Many Thanks,

Antonio

  • 0
    TI__Guru 50795 points

    Hi Antonio,

    Is the component [SN65HVD234] compatible with CAN FD?

    CAN FD is a data-layer protocol and mainly applies to transceiver selection by ways of maximum data-rate. Because SN65HVD234 supports signaling rates up to 1Mbps, it will also be compatible for CAN FD applications up to the same speed.

    I evaluated other trx, but I did not find a 3.3V wake-up component.

    I believe the feature you’re looking for is a Standby Mode. In this mode, the device driver and main receiver are disabled, and a low-power receiver monitors the bus for a CAN Bus Wake Request. Once this request is detected, the transceiver will notify the controller of the request. TCAN334 is a 3.3V CAN device which features a Standby Mode current of 15uA (Max). When detecting a Wake Request in Standby Mode, TCAN334 will drive RXD LOW to inform the controller of the bus activity. Let me know if you have questions about this device or if you have different requirements.

    I am also evaluating the identification of can trx via discrete…

    I am not aware of any content we have on this topic. As we provide a variety of CAN devices, we hope that something in our portfolio can be applied for CAN transceiver solutions at lower cost, higher reliability, and less complexity than discrete solutions. Let me know if there is a specific feature you are looking for if you can’t seem to find the proper device.

    Regards,
    Eric

  • 0 in reply to Eric Schott1
    TI__Expert 7230 points

    Hi Eric,

    Ok thanks, I had already seen the TCAN334, unfortunately the maximum voltage on the canl and canh lines is only 14V, I need at least 36. I am evaluating the TCAN1046EVM, which seems to be perfect for our purposes. What do you think about?

    Many Thanks,

    Antonio

  • 0 in reply to Antonio Faggio
    TI__Guru 50795 points

    Hi Antonio,

    I am only aware of TCAN334 (14v bus, 15uA standby) and SN65HVD234-Q1 (36v bus, 600uA standby) for 8-pin 3v3 CAN options. If 5v CAN is possible, TCAN1044 (8-pin, 58v bus, 1uA standby) and TCAN1046 (14-pin, 58v bus, 2uA standby) look to fit your requirements and both support CAN FD up to 8Mbps. 

    Regards,
    Eric