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TLIN1021A-Q1: Sleep to Standby Mode - RXD Edge Trigger

George Youngwirth
Prodigy 40 points

Part Number: TLIN1021A-Q1

We are using the LIN transceiver TLIN1021A-Q1 on one of our high voltage inlets programs. We are experiencing intermittent issues where the module is not waking up after LIN messages are sent to it. We have a theory that the LIN transceiver is recognizing the messages and is transitioning from Sleep to Standby Mode, but our MCU (LIN controller) is not always recognizing the RXD edge trigger. In this case the EN signal never gets turned on and we appear to be stuck in Standby mode indefinitely. When this fault happens it usually lasts for ~30seconds before waking up, presumably from a separate wake condition. Our question is, are there any timers or fault mechanisms that will transition the transceiver out of Standby Mode if the EN pin is never turned on. Based on the datasheet, we do not believe there is, but we wanted to reach out to confirm. 

  • 0
    TI__Guru* 75672 points

    Hi George,

    Figure 8-14 should be applicable and there shouldn't be another condition to force a transition out of standby mode if EN is not asserted.

    Hence, MCU missing the RXD signal may imply standby mode and within that 30s, another wake up condition may have occurred for the MCU to wake and assert EN for normal mode and may scope the IC pins + MCU pin similar to figure 8-14 to double confirm, thanks.

    Best Regards,

    Michael.