Wake from deep sleep in OMAPL138

nchukeg

Other Parts Discussed in Thread: OMAPL138

Hello,

In OMAPL138 if the unit is in deep sleep and SLEEPCOUNT is set to 0, is it OK to use an external pulse to wake up from sleep or the deepsleep pin must be set to high until SLEEPENABLE bit is cleared?

Thanks

Oleg

over 14 years ago

0 Mukul Bhatnagar over 14 years ago

TI__Guru* 83965 points

Hi Oleg

Putting SLEEPCOUNT to 0 would be to using it in a way that it was not designed to be used. The purpose of the sleep count is to give time for the oscillator to stabilize after coming back from deep sleep. We do not recommend setting this to 0. Given this an extenral "pulse" would not be the right way to do this.

Regards

Mukul

0 nchukeg over 14 years ago in reply to Mukul Bhatnagar

Intellectual 380 points

Hi Mukul

Thank you for the answer. Just to clarify: will the system come out of deep sleep mode if the DEEPSLEEP pin sees low-high-low pulse? Or it must be a level change that can only go low after the SLEEPCOMPLETE bit is set.

Thanks

0 Mukul Bhatnagar over 14 years ago in reply to nchukeg

TI__Guru* 83965 points

Hi Oleg

When exiting the deepsleep mode, you have to hold the DEEPSLEEP pin high until SLEEPCOMPLETE is set *and* you disable SLEEPENABLE mode (step 2 and 3 in the system guide). If you drop DEEPSLEEP pin after pulsig high, before this is doe, you could possibly go back in deep sleep mode.

Hope this helps

Regards

Mukul

0 sukhdeep singh over 12 years ago in reply to Mukul Bhatnagar

Prodigy 30 points

kindly tell me, in which location of file of kernel, do i change SLEEPENABLE in DEEPSLEEP register, when SLEEPCOMPLETE is set?

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Wake from deep sleep in OMAPL138