ESP32-P4: FB_DCDC Pin Function

[shraiwi]

Hi there,

I am currently using the ESP32-P4 to prototype an embedded product integrating a PMIC controlled via I2C. However, this would negate the need for an external feedback network, preventing me from connecting the FB_DCDC pin. I was wondering what the exact function of the FB_DCDC pin was? In the hardware design guidelines, the FB_DCDC pin is described as:

the feedback pin of the external DCDC, which regulates the voltages of VDDHP_0/1/2/3 together with software and external DCDC feedback resistors.

Does this mean that the pin is designed to regulate VDDHP_[0-3] digitally? Additionally, is it required for correct operation of the HP processors?

Thanks!