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TLIN1022-Q1: TLIN1022DRQ1

TIZIANA BELVEDERE
Prodigy 10 points

Part Number: TLIN1022-Q1

Tool/software:

Hello,

I'm using the LIN transceiver TLIN1022DRQ1 in our boards. I have two questions:

  1. I've read TI recommend to use the -A version. What are the differences? Footprint is different so I don't think we can move to the -A version, but eventually I will consider it for future projects.
  2. During the integration has been removed the external diode recommended to be used in the datasheet between LIN output and power supply. We've mounted only pullup resistor. At the moment, this controller is running without any issue. What is the risk to leave this integration?

Thanks for your support

  • 0
    TI__Guru 73722 points

    Hi Tiziana,

    The A version fixed a duty cycle over VSUP issue as the only difference. For more information, please see this errata here.

    Note that it is also cheaper for a better long-term supply. 

    Some risks involved in removing the diode would involve no longer having the protection from having the diode such as voltage spikes from the power supply that could potentially damage the LIN controller, IC protection from reverse polarity, thermal management to mitigate any increased thermal stress the LIN controller may experience and noise immunity that could affect communication.

    If intended for automotive applications, not following the recommended design could lead to non-compliance with safety and performance standards as prolonged usage without the diode could lead to failures over time. If feasible, I would further recommend re-evaluating the design with the recommended diode for long term reliability, thanks. 

    Best Regards,

    Michael. 

  • 0 in reply to Michael Ikwuyum
    Prodigy 10 points

    Thanks Michael!

    We have a common diode between controller battery voltage and Vsup/pullp. This should prevent the list of potential damages.

    From datasheet, it looks like a diode shall be present between controller battery voltage and vsup and additional diode between vsup and pullup.

    Instead from your answer, I understand that it id not mandatory. Is it correct?

  • 0 in reply to TIZIANA BELVEDERE
    TI__Guru 73722 points

    Hi Tizania,

    Correct. It is not needed for responder mode, but needed for commander mode similar to the data sheet, thanks.

    Best Regards,

    Michael.