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TLIN1021A-Q1: No state transition from unpowered to sleep since TLIN?

Yoshikazu Kawasaki
Intellectual 881 points
Part Number: TLIN1021A-Q1
Other Parts Discussed in Thread: SN65HVDA195-Q1,

Tool/software:

Hello,

I believe someone should have asked this question earlier, but I couldn't find it.  I couldn't find it in FAQ, either, so please let me ask it.  I'm sorry if I missed it.

My customer is interested in TLIN1021A-Q1.  It seems the LIN devices of the competitors have state transition from unpowered to sleep by the condition of Vsup>UVsup and EN=low which existed in SN65HVDA195-Q1, but it is unpowered to standby now on TLIN devices as shown below.

Questions

1. Would you please tell me the background why you've changed the state diagram from unpowered -> sleep by the condition of Vsup>UVsup and EN=low, to unpowered -> standby?

2. Is the change OK for OEM or LIN standard?  It should be OK though.

- SN65HVDA195-Q1(datasheet P.12)

- TLIN1021A-Q1(datasheet P.25)

Best Regards,

Yoshikazu Kawasaki

  • +1
    TI__Guru 51896 points

    Hi Yoshikazu,

    1. Ensuring the device enters standby mode from power up further ensures a more robust system responsiveness where fast startups are crucial in modern LIN networks.  

    2. Yes. The behavior is fully compliant with the LIN 2.x and SAE J2602 standards, which do not mandate sleep mode on power-up, allowing either sleep or standby as initial powered state, while focusing on ensuring proper current consumption, wake-up detection, and timing specifications.

    Most OEMs find standby-on-power-up more acceptable as it simplifies MCU control logic (no need to wait for a LIN pulse after cold start). Allowing faster bus readiness, thanks. 

    Best Regards,

    Michael. 

  • 0 in reply to Michael Ikwuyum
    Intellectual 881 points

    Hello Michael-san,

    Thank you very much for your quick reply.

    I provided your comments to our customer and am wiating for their reply.  Please let me ask you additional questions if I get.

    Best Regards,

    Yoshikazu Kawasaki

  • 0 in reply to Yoshikazu Kawasaki
    Intellectual 881 points

    Hello Michael-san,

    Thank you very much for your support.

    My customer agreed to closet this thread.

    Best Regards,

    Yoshikazu Kawasaki