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TLIN1021A-Q1: Let MCU received the LIN bus signal without INH pin

Frank QIN
Expert 9000 points
Part Number: TLIN1021A-Q1


Hi Team,

We are using LIN trx like TLIN1021A-Q1 in numbers of applications.

When the power supply is normal, MCU want to configure EN pin to enter sleep mode. While if there is signals on LIN bus, there would be some problems: 

Right now the MCU already let TLIN1021 entered sleep, the signal on LIN bus cannot be received by MCU. While the voltage on LIN bus will trigger TLIN1021 INH pin pulled high. We would like to learn if there is any method that can let the MCU receive the LIN bus data when sleep mode(not through INH pin). Or can we make MCU let TLIN1021 enter sleep mode and then isolate the LIN bus to reject all of the signal/data from LIN bus?

Thanks

Best,

Frank

  • 0
    TI__Mastermind 26826 points

    Frank,

    Happy New Year!

    The intent of Sleep mode in a transceiver is to stay in a very low power state until a wake-up event occurs either on the communication bus or on the local wake-up input. The MCU can be completely unpowered in this state, only to become reactivated when the INH output reactivates the LDO or power supply it's connected to.

    So, to your first question, if you want to properly receive information on LIN, you'll need to be in Normal mode, as this is the intent of the mode. Sleep mode deactivates the transceiver used in Normal mode.

    To your second question, the transceiver cannot "reject" all activity on the bus as long as VSUP is supplied. To completely prevent the transceiver from changing the state of INH due to LIN bus activity, you'd need to completely remove VSUP.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    TI__Expert 9000 points

    Hi Danny,

    Happy New Year and thanks for your reply.

    If the nSLEEP is LOW, when there is signals on LIN bus, will INH always HIGH? Or pulse pulled high? If the INH is always high, the power system can't enter sleep mode.

    P.S. Vsup is always powered.

    Thanks

    Best,

    Frank

  • 0 in reply to Frank QIN
    TI__Mastermind 26826 points

    Frank,

    Yes, once there is activity on the LIN bus, including an appropriate pulse, this is interpreted as a remote wake-up pulse and brings the device from Sleep mode into Standby mode, which brings INH high. The only way to return to Sleep mode is through Normal mode by changing the EN pin.

    Best,

    Danny