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RTC-controlled deep sleep on OMAPL138

nchukeg
Intellectual 380 points
Other Parts Discussed in Thread: OMAPL138

Hello,

On OMAPL138 after configuring internal RTC and going into deep-sleep, is it possible to turn off the power to the processor (except for the RTC power pins) and still have RTC generate an interrupt?

The idea is to have an external hardware logic that shuts off the power to the OMAPL138 and external memories except for internal RTC and turns it back on when deepsleep pin goes low.

Thank you

Oleg

  • 0
    TI__Expert 8785 points

    nchukeg said:
    On OMAPL138 after configuring internal RTC and going into deep-sleep, is it possible to turn off the power to the processor (except for the RTC power pins) and still have RTC generate an interrupt?

    Unfortunately, this is not possible.  The RTC_ALARM pin, which is powered by the I/O power rail, is used to wake up from Deep-Sleep.  Since you turn off the power to the I/O supply, you will not be able interrupt and wake back up.  A more detailed explanation can be found in the Section 10.8 (RTC-Only Mode) of the System Reference Guide.

    --Christina