Exit from SNVS mode

[andrewkinmont]

We are having issues with getting our custom i.MX RT1051 board to exit SNVS mode using the wakeup pin, and wondered if this is an issue that might have been seen by others.

To test this, we are using the Power Mode Switch example application from the latest SDK. When we compile it for our board, we are able to exit from SUSPEND, but not from SNVS, using the wakeup pin. We have modified the code to also allow us to test wakeup using an SRTC alarm, and this works fine, which suggests that there is some issue with recognising the wakeup pin interrupt when the board is in SNVS mode.

We have also tested this same example application on our evaluation board, and it works fine (using the wakeup pin), however, our evaluation board is an older one that has the A0 step of the silicon, whereas our custom board has A1 silicon fitted.

Has anyone tested the Power Mode Switch example application on a newer evaluation board (one that has A1 silicon fitted)? This would probably eliminate the silicon revision as a possible source of the issue that we are seeing.

Thanks,

Andrew

[kerryzhou]

Hi Andrew,

  Thanks a lot for your test result and detail information.

   So, could you try to remove your two mosfets, then test it again? If you suspect the rise time, you also can add the capatcitor in the EVK board and test it.

  From the RM, 2 32KHZ cycle is enough to wake up in the WAKEUP pin.  But it didn't mentioned the rising time.

   These days, do you have any progress or updated information on your own board?

Have a great day,
Kerry

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[kerryzhou]

Hi Andrew Kinmont

  Thanks for your updated information.

  So, please compare the two schematic at first, any updated information, just let me know.

Have a great day,
Kerry

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[andrewkinmont]

Hi Kerry,

Just wondering if you have any more that you can offer regarding our issue with the processor not re-starting when we activate the wakeup pin. As I mentioned, there is no issue with the processor restarting from SNVS mode using an SRTC alarm, and we are also able to exit Suspend mode using the wakeup pin.

The only time there is an issue is when we use the wakeup pin to exit SNVS mode.

Any clues, or things we can test, would be very gratefully received.

Thanks,

Andrew