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Nucleo board consuming too much on external power supply

Question asked by marttin on Dec 15, 2015
Latest reply on Dec 15, 2015 by marttin

I've got a Nucleo board, it's a L152RE Rev C.
I've tested the example PWR_STP_RTC available for these boards and the board successfully lowered it's consumption from 9.3 mA (in running mode) to 1.5 uA (in stop mode).

On the other hand, when I power the board externally from an external power supply of 3V3, the consumption is around 9.5 mA (in running mode) and 415 uA (in stop mode).

Does anyone understands why is these happening and what can I do to reduce consumption?
I expect to eventually consume as little as I can while powering my project with batteries.