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FRDM-KL03: Waking from LLWU vs LPTMR Interrupt, why is the current not the same?

Question asked by Sara Stout-Grandy on May 4, 2017
Latest reply on May 8, 2017 by Kerry Zhou

Hello,

 

I'm working with the FRDM-KL03 and KDS. I can successfully wake from VLLS0 with either the LLWU pin interrupt or the LPTMR interrupt. However, the resulting current measurements are not the same.

 

When the processor wakes via the LPTMR interrupt, the wake-up current is the same as the current before going to sleep (~5.6mA). When the processor wakes via the LLWU pin interrup, the wake-up current is not the same as the going to sleep current, it is about 1mA less (~4.5mA).

 

I'm at a loss to explain this. Is it not returning to the same state? Is it enabling something in the background that I'm not aware of? Any ideas?

 

Thanks,

 

Sara

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