STM32H7 PDR_ON signal

[Gpeti]

I don't understand the goal of pin PDR_ON.

From STM32H7 reference manual:

 

I don't understand what "the power on/off reset function can be disabled" means. The product does not go to reset state even if the voltage goes below PDR threshold ?

[RomainR.]

Hi @Gpeti 

The function of PDR_ON pin is to enable/disable the internal power supervisor (power-on reset (POR) / power-down reset (PDR) circuitry).
- Pin PDR_ON = VDD,  the internal power supervisor is enabled, if VDD goes below a specified threshold, the device is placed in reset mode. 
- Pin PDR_ON = VSS , the internal power supervisor is disabled and the user should implement an external power supply monitor for VDD and NRST.

You can refer to AN4938 in section 2.3.5 and 2.3.6.

Let me know if it helps you?
With regards,
Romain,