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TCAN334: TCAN334 to meet ISO 15765-4 and SAE J1939

Ting Ye
Genius 11800 points
Part Number: TCAN334
Other Parts Discussed in Thread: SN65HVD234

Dear Team,

May I know have your confirmation that TCAN334/G can replace SN65HVD234D and meet below two standards fully?

1.     ISO 15765-4 (CAN), 11/29Bit ID, 250/500Kbaud

2.     SAE J1939

 

Thank you.

Regards,

Ting

  • 0
    TI__Guru 62910 points
    Hi Ting,

    In general TCAN334 can serve as a pin-for-pin replacement for SN65HVD234, but we will have to double check whether it can meet these standards' requirements fully. We will review the standard information and get back to you by the end of the week.

    Regards,
    Max
  • 0 in reply to Max Robertson
    TI__Guru 62910 points
    Ting,

    My understanding is that ISO 15765-4 bases its CAN network requirements based on ISO 11898-1 and ISO 11898-2, and so any transceiver implementations compliant to ISO 11898-2 could be used. If you think this is incorrect please let me know.

    TCAN334 (and other 3.3-V-powered CAN transceivers) generally present some challenges with respect to full compliance to ISO 11898-2, since that standard was written based on a 5-V transceiver architecture. Because of this, the standard requires a minimum CANH level of 2.75 V during the dominant state. Since this level varies with the supply voltage, most transceivers that are powered from lower voltages would not be able to meet it. For example, TCAN334's minimum CANH level is 2.45 V, slightly below the requirement. The standard also recommends a recessive-state voltage between 2 V and 3 V (with the goal of it nominally being VCC/2), but this is higher than some 3.3-V devices could support. (TCAN334's nominal recessive-state output voltage is 1.85 V.)

    For SAE J1939, I would generally expect similar limitations. I can confirm this if you can provide the full standard number. There are several different J1939 variants depending on the application and physical layer implementation (data rate, cabling, etc.):

    www.sae.org/.../j1939a.htm

    Best regards,
    Max