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Current consumption behaves like saw-tooth

Question asked by Shooja.Rizwin on Feb 24, 2015
Latest reply on Mar 3, 2015 by Amel N
I measured the current consumption of STM32F3 discovery board from its Idd pin and I always see the current consumption decreasing with time over a period of 50-60 seconds and then shoots up to the initial value. I used a standard example from ST STM32F3-Discovery_FW_V1.1.0\Project\Peripheral_Examples\ADC_Example and tried putting a while(1); loop as the first line of main().

I have found the same effect on STM32f373 MCUs as well.

Can someone tell me the reason for that and how to rid of this saw tooth behaviour?
Please find attached the screenshot of the behaviour from the oscilloscope.