STM32L151CBT6A CURRENT IN STAND BYMODE

[Fabrizio70]

Does the current consumption of the micro stm32L151 in stand by mode with the RTC enabled vary with the supply voltage?
From my tests I find that by powering the micro with 3.1 V I have a current consumption of about 4 microA while if I power it with 3.3V the current is 400microA

[Sarra.S]

Hello @Fabrizio70, 

Yes, the current consumption should vary when varying the supply voltage, however, the increase from 3.1 V to 3.3 V shouldn’t result in a jump from 4 µA to 400 µA under normal conditions! 

As you can observe from the datasheet for stop mode: 

Under the same temperature conditions, with RTC enabled: 

At VDD=1.8 V, the typical current consumption is 1.33 µA.

At VDD=3 V, the typical current consumption is 1.62 µA.

At VDD=3.6 V, the typical current consumption is 1.87 µA.

So, there might be an issue with your configuration 

[Andrew Neil]

How do you know that the excess is due to the MCU?

When it's down to a few uA, leakage from other components can be significant.

eg, some capacitors can have voltage-dependent leakage ...

You need to show your test setup, and describe your test method!

How to write your question to maximize your chances to find a solution.