RTC VBAT PIn
Posted: Fri Nov 13, 2020 8:24 pm
Hello guys, how are u?
I'm having some troubles using the internal RTC of ESP32. I'm used to develop with microcontrollers that has internal RTC and also a pin called VBAT Pin, that i'm able to wire a coin cell battery to this pin and the system still keeps track of time, even if it has no power supply. Is there any VBAT pin in ESP32? I read on some other topic to wire the coin cell on GPIO36, but it didn't work, time reseted after power went off.
I know i can wire a battery to VCC but due to PCB and budget requirements, this is not possible.This is the same reason why i can't use DS3231 or something similar either. Also, i tought since ESP32 has an internal RTC, why to use an external module? Unless, there is no way to keep track of time while powered off.
I may or may not have internet to get the time from SNTP when the system restart, that's why i need RTC to keep counting. And time is a vital parameter for my system to execute properly.
I really hope ESP32 have a way to keep track of time with a VBAT pin, it would be weird to me that such a robust microcontroller doesn't have this feature like other common devices on the market.
I'm having some troubles using the internal RTC of ESP32. I'm used to develop with microcontrollers that has internal RTC and also a pin called VBAT Pin, that i'm able to wire a coin cell battery to this pin and the system still keeps track of time, even if it has no power supply. Is there any VBAT pin in ESP32? I read on some other topic to wire the coin cell on GPIO36, but it didn't work, time reseted after power went off.
I know i can wire a battery to VCC but due to PCB and budget requirements, this is not possible.This is the same reason why i can't use DS3231 or something similar either. Also, i tought since ESP32 has an internal RTC, why to use an external module? Unless, there is no way to keep track of time while powered off.
I may or may not have internet to get the time from SNTP when the system restart, that's why i need RTC to keep counting. And time is a vital parameter for my system to execute properly.
I really hope ESP32 have a way to keep track of time with a VBAT pin, it would be weird to me that such a robust microcontroller doesn't have this feature like other common devices on the market.