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Kinetis K60 RUN to DEEPSLEEP transition time.

Question asked by Przemyslaw Ostrowski on Jun 11, 2015
Latest reply on Jun 11, 2015 by jeremyzhou

Hi,

I am working on a project where low power consumption is a priority.

At the moment I am using LPTMR (driven by RTC clock) to wake MCU every 1 ms  for about 50 us and get back to VLLS1 mode.

When I disable the LPTMR wakeup the current consumption in VLLS1 mode is about 20uA. But when it wakes up every 1ms the average current consumption grows to about 2mA.

I set GPIO pin high when the MCU is woken up and I clear the pin just before it goes to deepsleep (just before I call WFI).  On the scope I can see that the most current is consumed just before wakeup and a few ms after GPIO pin is set low (so a few ms after it should go to deepsleep).

So my questions are:

1. How long does it take to transit from RUN / LVPR mode to VLLS1 mode?

2. How much current K60 consumes during that transition from RUN / LVPR mode to VLLS1 mode?

3. Can I get average current consumption on level about 300uA (still waking up every 1 ms)?

 

Thanks for help.

 

John

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