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TLIN1441-Q1: Can TLIN1441-Q1 be used with 24V stable power rail?

Kazuya Nakai59
Guru 20640 points
Part Number: TLIN1441-Q1
Other Parts Discussed in Thread: TLIN2441-Q1

 One of out customers is considering using TLIN1441-Q1 for their new products.

 The products are not automotive product. Also the power supply voltage in the product is 24V.

 They have a questions as the follow.

 Could you give me your reply?

 Q. Power supply in their products is 24V and the voltage is very stable.

        Also they want to use TLIN1441-Q1 because the device proce is lower than TLIN2441-Q1.

        Can TLIN1441-Q1 be used with 24V stable power rail?

 Your reply would be much appreciated.

 Best regards,

 Kazuya.

      

  • 0
    TI__Guru 68422 points

    Kazuya,

    Yes, if the customer can absolutely confirm that there will be no transients on the supply line and it stays at 24V, then the TLIN1441-Q1 will work. The reason it is not meant for 24V automotive applications is because of the transient possibility during a load dump situation in a vehicle. In this condition, the battery voltage can spike higher than 42V, so the TLIN1441-Q1 would not be sufficient.

    As long as the VSUP voltage never goes above 42V in this customer application, using the TLIN1441-Q1 will work just fine.

    Regards,

  • 0 in reply to Eric Hackett
    Guru 20640 points

     Hello Eric,

     Thank you very much for your reply.

     Could I ask you an additional question as the below?

     Q. Can LIN bus terminal (No.5) of TLIN1441-Q1 working with 12V power supply be connected

          to LIN bus terminal (No.5) of TLIN2441 working with 24V power supply?

     Thank you again and best regards,

     Kazuya.     

  • 0 in reply to Kazuya Nakai59
    TI__Guru 68422 points

    Kazuya,

    Unfortunately no this will not work, and this is due to the LIN bus thresholds for a dominant and recessive bit, and the output levels of the LIN pin. The LIN pin output levels and the dominant/recessive thresholds are based on the VSUP level.

    A high output on the LIN pin is 0.85 * VSUP or greater (20.4V for 24V system, 10.2V in a 12V system), a low output on the LIN pin is 0.2 * VSUP or lower (4.8V for 24V system, 2.4V in a 12V system). The dominant threshold for LIN is 0.4 * VSUP or lower (9.6V in a 24V system, 4.8V in a 12V system) and the recessive threshold is 0.6 * VSUP or higher (14.4V in a 24V system, 7.2V in a 12V system).

    So in a 24V system the recessive threshold is 14.4V or higher, and so the LIN node supplied with 12V will never be able to reach that threshold, as it is higher than the overall supply. In general, LIN clusters are meant to share the same supply voltage, you can get by if the supply voltages are close enough, but 12V and 24V are too different in value to work together.

    Please let me know if you have any other questions.

    Regards,

  • 0 in reply to Eric Hackett
    Guru 20640 points

     Hello Eric,

     Thank you very much for your reply.

     I could understand it well because of your kind eplanation.

     I will ask you again if I have any question about LIN devices

     Thank you again and best regards,

     Kazuya.