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

x_arrange
Posts: 11
Joined: Sat May 20, 2017 10:32 am

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

Postby x_arrange » Wed Feb 13, 2019 8:34 am

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?
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ESP_Sprite
Posts: 8921
Joined: Thu Nov 26, 2015 4:08 am

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

Postby ESP_Sprite » Thu Feb 14, 2019 3:01 am

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.

app-z0
Posts: 4
Joined: Sun Jun 21, 2020 9:49 pm

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

Postby app-z0 » Mon Jul 20, 2020 8:54 pm

Opposite question. Can I keep VDD3P3_RTC not connected?
If I dont use RealTime schematic with timer quartz 32768
Stay its float

ESP_Sprite
Posts: 8921
Joined: Thu Nov 26, 2015 4:08 am

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

Postby ESP_Sprite » Tue Jul 21, 2020 7:45 am

No. It powers a chip domain that is needed for normal use.

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