ESP32-P4: How to connect VDD_USBPHY pin?

The VDD_USBPHY pin on the ESP32-P4 microcontroller is used to power the USB physical layer (USB PHY) interface.

It’s a 3.3V pin with a voltage range of 3.0V to 3.6V (absolute maximum rating of 3.96V). Supplying a higher voltage than 3.6V may destroy the chip.

For this reason, connect the VDD_USBPHY pin to a 3.3V power supply - typically, the same power supply used to power other 3.3V rails.

The maximum power consumption of the USB PHY is about 20mA during operation.

You must place 10nF, 100nF, and 1µF capacitors as close as possible to the VDD_USBPHY pin (all connected between VDD_USBPHY and ground) to ensure stable operation of the USB PHY.

You should not connect the VDD_USBPHY pin to the analog 3.3V supply as it might introduce noise into the analog circuits connected to the analog 3.3V supply.

If you intend to minimize power consumption, please read the USB PHY power supply section of the ESP32-S4 hardware design guidelines

Source: ESP32-P4 hardware design guide