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TLIN1021-Q1: Sleep mode of TLIN1021DRQ1

Part Number: TLIN1021-Q1

Hi there

According to spec of TLIN1021DRQ1, 

if pull low "EN" pin, TLIN1021DRQ1 would get into sleep mode and turn "INH" pin off

But currently "INH" pin keeps high voltage output , transceiver stops data communication

  • Hi Arthur,

    When in sleep mode INH is high-Z and not pulled to ground.  Depending on the PCB leakage and parasitic capacitance it may take a while to discharge.  If you don't have a pull-down resistance on this pin, you may want to try that.  100 kOhm is a common value.

    It is also possible that you successfully transition to sleep mode but then the device transitions to standby mode due to detection of a wake event.  In standby mode the INH pin would be re-asserted high.  Events that could trigger this wake-up transition would be a change of state on the WAKE terminal or activity on the LIN bus that meets the wake-up criteria.  You can refer to Section 9.4.4 of the datasheet for further details on this.

    Regards,
    Max

  • Hi Max

    Thanks your reply!

    I added a 100 kohm resister connect INH pin to groud but not useful

  • Arthur,

    Thanks for checking.  Did you also look into the possibility of the device waking up into standby mode due to activity on LIN or toggling on WAKE?

    Max

  • Hi Max

    It's solved

    I guess speed of processor is too fast, after sleep mode executed,

    the lin bus package still transmit checksum and also wake transceiver up