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Power controller questions on STM32F401RE

Question asked by Dimitris Paraskevopoulos on Feb 25, 2017
Latest reply on Mar 2, 2017 by Khouloud G

Related reference manual RM0368

http://www.st.com/content/ccc/resource/technical/document/reference_manual/5d/b1/ef/b2/a1/66/40/80/DM00096844.pdf/files/… 

 

Related datasheet 

http://www.st.com/content/ccc/resource/technical/document/datasheet/30/91/86/2d/db/94/4a/d6/DM00102166.pdf/files/DM00102… 

I have a couple of questions about the power controller

1. 

Page 74 Section 5.2.1 Figure 8

According to the text

 

"The device remains in Reset mode when VDD/VDDA is below a specified threshold, VPOR/PDR"

 

So either the diagram is wrong or Reset line is using negative logic (1 is low and 0 is high). Can someone confirm which is the correct statement?

 

2.

Brown out detection seems to perform the exact same thing as the power on reset. Why is there a need for both of them?

 

Thank you very much for your time.

 

With kind regards,

 

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