ESP32 Forum

Hi, I'd like to use esp32 without wifi network, just as a budget effective microcontroller.
I need an information if am I able to holdup RTC time by connecting goldcap capacitor to VDD3P3_RTC and via diode to the other VDD3P3 pins.
Tell me firstly if the microcontroller will work and won't provide any (leakage) current via it's pins. What will happen when watchdog occur? Will esp work when VDD3P3_RTC will be lover by schottky diode voltage drop? How should I connect enable pin (CHIP_PU) - to VDD3P3_RTC or VDD3P3 (is it needed if would quit everything but RTC timer)?

No, you can't. The ESP32 is not designed to use a battery/supercap backup. You may be able to work around it somehow by noticing the power is failing, putting the ESP32 into deep sleep mode, and then running it entirely from the supercap, but it's a finnicky proposition.