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TLIN1021A-Q1: Wakeup through EN

Evan Wang
Genius 9590 points
Part Number: TLIN1021A-Q1

Hi TI Expert,

For TLIN1021A-Q1, if we try to wakeup the device through EN pin, we expect to see a pulldown period on TXD pin according to datasheet.

But I'm wondering the pulldown period is controlled by LIN transceiver internal mechanism or the MCU has to send a low signal on the TXD pin?

And I believe the low period on LIN and RXD pins are also controlled by LIN transceiver itself, am I right?

Thank you.

  • 0
    TI__Guru 74282 points

    Evan,

    This diagram is meant to show that once the device is in Normal mode, it is able to transmit to the LIN bus through the TXD pin and the RXD pin will respond to the LIN bus. It is not meant to show the device's response to setting EN high. 

    Please let me know if you have any other questions.

    Regards,

    Eric Hackett 

  • 0 in reply to Eric Hackett
    TI__Genius 9590 points

    Hi Eric,

    Thank you for the clarification.

    Below is what we found on the board.

    1. Part 1: If TXD pin is already low before EN pull high, is it acceptable? or we have to make sure the TXD pin is high before pull high the EN pin?  If it's acceptable(TXD remain low already), the LIN Bus(low) will respond to TXD pin(Low) right after we pull high EN pin? 

    2. Part 2: We notice the LIN Bus turn high even the TXD pin is low, it might reach the condition of "Dominant state time out(tTXD_DTO)".

  • 0 in reply to Evan Wang
    TI__Guru 74282 points

    Evan,

    1. Yes, this is acceptable. TXD being low won't have an effect on the device's transition from Sleep to Normal mode.

    2. Yes, this is the LIN bus releasing when TXD is held low for too long.

    Regards,

    Eric Hackett