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What is the purpose of VDD3P3_RTC pin in ESP32-PICO-D4 ?

Posted: Wed Feb 13, 2019 8:34 am
by x_arrange
I want to understand how to keep RTC clock working while chip logic is off(if possible)

if I connect VDD3P3_RTC to 3.3V supercapacitor/battery would it be enough? Do I need also to provide 3.3V to CHIP_PU?

Re: What is the purpose of VDD3P3_RTC pin in ESP32-PICO-D4 ?

Posted: Thu Feb 14, 2019 3:01 am
by ESP_Sprite
Unfortunately, what you want is not possible on the current ESP32 design as the RTC voltage rail powers other bits of the chip as well.

Re: What is the purpose of VDD3P3_RTC pin in ESP32-PICO-D4 ?

Posted: Mon Jul 20, 2020 8:54 pm
by app-z0
Opposite question. Can I keep VDD3P3_RTC not connected?
If I dont use RealTime schematic with timer quartz 32768
Stay its float

Re: What is the purpose of VDD3P3_RTC pin in ESP32-PICO-D4 ?

Posted: Tue Jul 21, 2020 7:45 am
by ESP_Sprite
No. It powers a chip domain that is needed for normal use.