STM32F7X internal regulator won't start

[TallGUY]

hello I am using the STM32F779NXH MCU it has an internal 1.2V voltage regulator that I believe should output volt on the CAP_1 and CAP_2 pins. The MCU will not boot, and will not be recognized by the st-link. This is a brand new board and has never been programmed.

I have connected the BYPASS_REG pin directly to GND as stated in the data sheet https://www.st.com/resource/en/datasheet/stm32f777bi.pdf. ( page 33 I believe).

I am wondering if there is anything else I should look for as to why there is no voltage on the CAP_1 and CAP_2 pins.

RESET is held high through a 10K resistor to 3.3V, but the data-sheet doesn't mention that the voltage regulator is dependent on RESET.

Also 3.3V is present and correct.

Attached is an image of the MCU page of the Schematic.

[waclawek.jan · Accepted solution]

From that schematic it is not clear whether VDDA is connected to the power supply.

JW

[TallGUY]

Good eye, you're a life saver. I owe you all the beers. Blue wired it up and boom it works!​