ESP32-P4: How to connect VDD_IO pins?

On the ESP32-P4 microcontroller, the VDD_IO pins are used to supply power to the input/output (I/O) circuitry of the chip.

You can connect the pins to either a 3.3V power supply or a 1.8V power supply, depending on the voltage level you want to use for the I/O pins.

Keep in mind that whatever voltage level you choose for the VDD_IO pins, it must be compatible with the I/O levels of the devices you are connecting to the ESP32-P4. For example, if you choose to use 3.3V for the VDD_IO pins, make sure that any external devices you connect to the ESP32-P4 can also operate at 3.3V levels.

The allowable voltage range is:

• 1.65V to 1.95V for 1.8V operation with absolute maximum: 1.62V to 1.98V
• 3.0V to 3.6V for 3.3V operation with absolute maximum of 3.6V
• Any voltage exceeding the absolute maximum rating of 3.6V may damage the chip.

Typically you would connect the VDD_IO pins to 3.3V.

You need to add a 100nF decoupling capacitor for each VDD_IO pin and place it as close as possible to the pin to help filter out noise and provide a stable voltage supply to the I/O circuitry.

Source: ESP32-P4 hardware design guide, ESP32-P4 datasheet