Deep sleep power consumption external vs internal RTC

mitchk
Posts: 16
Joined: Fri Apr 28, 2017 8:31 pm

Deep sleep power consumption external vs internal RTC

Postby mitchk » Thu Sep 06, 2018 12:53 pm

From a power consumption point of view is there any difference using the external RTC source instead of the internal?

WiFive
Posts: 3529
Joined: Tue Dec 01, 2015 7:35 am

Re: Deep sleep power consumption external vs internal RTC

Postby WiFive » Fri Sep 07, 2018 1:53 am

Well you can buy rtc that go down to tens of nanoamps so it depends.

mitchk
Posts: 16
Joined: Fri Apr 28, 2017 8:31 pm

Re: Deep sleep power consumption external vs internal RTC

Postby mitchk » Fri Sep 07, 2018 4:48 pm

Thanks that is a good point. I guess my real question is for all of the circuitry within the ESP32 being clocked by the RTC during deep sleep mode is there any difference in power consumption based on whether the internal or external RTC is used. Subtracting the power drawn by the RTC itself.

WiFive
Posts: 3529
Joined: Tue Dec 01, 2015 7:35 am

Re: Deep sleep power consumption external vs internal RTC

Postby WiFive » Fri Sep 07, 2018 10:48 pm

What you seem to be asking is what is the difference in power consumption when using the internal 150khz oscillator vs using an external 32.768khz crystal. I'm not sure, but hopefully someone can give you an answer.

ESP_igrr
Posts: 2067
Joined: Tue Dec 01, 2015 8:37 am

Re: Deep sleep power consumption external vs internal RTC

Postby ESP_igrr » Sat Sep 08, 2018 7:15 am

Current consumption of ESP32 will be:

External 32k oscillator < internal 150k oscillator < external 32k XTAL, difference between these options is in 0.5 uA range.

mitchk
Posts: 16
Joined: Fri Apr 28, 2017 8:31 pm

Re: Deep sleep power consumption external vs internal RTC

Postby mitchk » Mon Sep 10, 2018 12:23 pm

Thanks!

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