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TCAN844-Q1: Short to 16V battery

Wang Han
Prodigy 160 points

Part Number: TCAN844-Q1

Hi expert,

I noticed that the max voltage of this part is lower than others. Do you suggest this part use in 12V automotive application? If one of the CAN bus is shorted to 16V battery voltage, the other one is floating, if the part will be demaged? What if the 60 ohm resistors are not installed?

 

Thanks,

Han image.png

 

  • 0
    TI__Guru 74062 points

    Hi Han,

    Please note that the data sheet's VDIFF is planned to be updated to 40 V.

    However, yes the selected device was made cheaper to mainly support 12 V applications and 16 V short may only damage the device if the IC pin observes voltages > than the abs max rating. Note that due to CMC / inductance on the bus per the system environment, it is very common to see > than the applied voltage / shorts and would recommend to verify based on the environment to double confirm, thanks. 

    Best Regards,

    Michael. 

  • 0 in reply to Michael Ikwuyum
    Prodigy 160 points

    Hi Michael,

    Thanks for your reply. Can you help estimate when the new datasheet will be released? If my understanding is correct, just apply <40V DC voltage on either CANH/CANL, the chip will not be demaged, right? 

    Thanks,

    Han

  • 0 in reply to Wang Han
    TI__Guru 74062 points

    Hi Han,

    Yes, the chip should not be damaged if the IC pin also sees < 40 V. I.e, applying < 40 V do not necessarily mean < 40 V will be observed. Depending on the overall bus inductance present in the system and would recommend to verify per your system environment. 

    The systems team is waiting on the next refresh to publish the data sheet and I expect to be released this year, thanks. 

    Best Regards,

    Michael.