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TLIN2021A-Q1: Use in BMS with Vsup up to 58V

Christopher Hackl
Prodigy 20 points
Part Number: TLIN2021A-Q1

Hello TI Team.
I have a question about this component.
We have a battery system with a BMS that has a communication interface similar to the LIN bus. But with discrete components.


Now the question arises whether a LIN transceiver can also be used. However, the voltage level could be a problem, as Vsup and LIN range between 38-58V depending on the battery's state of charge.
Would this be possible with your components?
If required, I can also send you the current circuit.

  • 0
    TI__Guru 73271 points

    Hi Christopher,

    We've assigned a LIN subject matter expert to this thread who should get back to you by beginning of next week. 

    From my quick glance at the datasheet, it looks like Vsup and VLin can handle up to 60V as an absolute max (it will not break) but outside of 45V the device will likely operate outside of the electrical parameters (we test/validate/screen based on the recommended operating conditions).

    -Bobby

  • +1
    TI__Mastermind 26806 points

    Christopher,

    It depends on how stringent your system requirements are for making your interface perform "similar to the LIN bus." Transceivers like the TLIN2021A-Q1 are capable of operating normally (i.e. within Electrical Characteristics) when VSUP is between 4.5V and 45V. When the supply exceeds 45V but stays below 60V, the device will survive, but the electrical specifications might begin to differ. For example, current consumption might increase, switching times may change, or duty cycle characteristics may differ slightly. However, I've seen engineers use these devices in these environments with success in the past.

    In most cases, when users mention that supply can be "up to 58V," this actually refers to transient voltages up to 58V. In other words, the system is not intended to operate at 58V but it could happen during load dump. This is precisely what the components are designed for. If the bulk of your communication will be taking place between 38V and 45V, then you'd be within nominal recommended operating conditions for the TLIN2021A-Q1.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    Prodigy 20 points

    Hello Danny,

    Thank you very much for your answer.
    The way I interpret it, it should also work with higher voltages, but this is outside the specifications. Therefore, we should test this extensively in advance.

    In our application, the 58V are not "transient voltages" but can be constantly present when the battery is fully charged, depending on its state of charge.

    I think your answer answers my question and we'll just have to try it out.

    Kind regards
    Christopher