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STM32F401 STOP mode power consumption

Question asked by Gordon Williams on Sep 11, 2014
Latest reply on Aug 18, 2015 by Gordon Williams
Hi.

I've been trying to enter STOP mode in an STM32F401 with:

PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);

When doing so, power consumption drops to 1.5mA so it's doing something.

However, when I use the simple STOP example, I get something in the region of 0.05mA, which is obviously much better.

So... Any ideas what's causing the increased power draw? I turn off the ADCs, but I am using USB.

On STM32F1 I set CNTR_PDWN for USB, and I can see gccfg.b.pwdn - but there is no function available to reset it. Is that the problem?

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