Power Domains in STM32F401xC

[AbdAllah Talaat]

Hello everyone , 

I was reading in the power controller section 5 in RM0368 , I had some difficulties understanding some terms and distinctions and I would like your support please .

 

The main goal ifor me is to  categorize each group of functionalities by their power source as as being Digital VDD , Analog VDDA , VBAT powered .

 

According to figure 7 page 71 : 

 

The analog domain is ADC , RCs and PLLs and .. etc , I would like to know a complete list of the rest of functionalities associated with the analog Domain , Even in DS9716 Page 18 section 3.13 third Bullet it specify a partial list of blocks but it includes “Reset Blocks”  , what does reset block refer to exactly can i conclude safely its the POR , PDR , BOR , PVD blocks exactly or that is not correct or partial .

Regarding digital domain the word “digital” does it mean “Digital peripherals” ?  

Why “IO Logic” different  from “GPIO peripheral” being a part of digital peripherals ?

For VBAT , what is the functionality of “wakeup logic” and the difference to “standby circuitary” term .

 

The above inqueries/questions are just an example of some points that is not clear for me , but ideally i need just a small tree like diagram for power sources , with leaf nodes a list of functional compoents in a sharp clear way , if the category can’t be decomposed to a list if subfunctional levels (can’t be disclosed) I just need the functionality of what it does what are input and output as black box .

 

I know the end inquiry may not be a practical problem but I need it for internal documentation and study purpose .

 

Thanks too much for any support and help in advance .

 

[FBL]

Hi @AbdAllah Talaat,

If your concern is power interruption behavior, it is generally better to analyze it through the reset status flags in RCC_CSR rather than relying on backup registers alone.

I can confirm that the device supports brown-out reset BOR and programmable voltage detector PVD, which can help identify when the supply voltage drops below safe operating levels.

The VBAT pin powers the backup domain. When VDD is lost and VBAT remains present, the backup registers, RTC, and related backup domain settings are retained. However, backup registers cannot detect all power failures, especially if VDD collapses during a write operation.

[AbdAllah Talaat]

Hi ​@FBL  , 

 

First Thanks for your reply ,

My goal to understand for each power pin (power domain Digital , Analog or VBAT ) what are peripherals or functional blocks powered from that pin / domain , I was reading the data sheet and came accross the following three terms :

 

Reset Blocks (RM 5.2.1 , 5.2.2 , 5.2.3 ) , The confusion comes because I am not sure whether the intended menaning by that term is to refer to POR , PDR , BOR , PVD functional blocks (as reset sources) mentioned in the  power chapter , or to the reset circuitary mentiones in the following figures :

 

 

 The other two terms (Wakeup Logic , Standby Circuitary ) are mentioned in the same RM in the following two figures , the confusion for those two terms comes from the fact I feel they are related but but can’t understand the difference in functionality between the two terms :

 

Thanks in advance 

AbdAllah Talaat