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.