ESP32-S3: VDD3P3 versus VDDA

[hanele bersy]

Hi ESP-community,

ESP32-S3 has two different net labels for the Analog power domain: VDD3P3 and VDDA.

VDDA is shown in the power scheme below (from the datasheet of ESP32-S3 Series) :

Power_scheme.png (54.24 KiB) Viewed 3743 times

But VDD3P3 is shown nowhere. I've looked into the datasheet, the manual and the hardware design guidelines, but I don't find any information about what VDD3P3 is specifically powering

What's the difference between VDD3P3 and VDDA ? Are they internally connected ?

Finally, is it VDDA or VDD3P3 that's generating the internal Vref for the SAR ADC's ?

I hope I hear some feedback from you.

Best regards and have a nice week.