Different external RTC clock frequency

kfine100
Posts: 4
Joined: Wed May 20, 2020 7:00 am

Different external RTC clock frequency

Postby kfine100 » Mon Jun 21, 2021 3:05 pm

I am using the ESP32-WROOM-32E module, and I see that the RTC clock can be driven externally thru the XTAL_32K_P input (IO 32). A 32.768 kHz oscillator is specified. I am considering changing to a 1 PPM clock for more accurate timing, but is it possible to use a different frequency? For example, the internal clock source is 150 kHz. What would be the consequences?

Thanks for any help.

ESP_LJH
Posts: 384
Joined: Tue May 18, 2021 9:21 am

Re: Different external RTC clock frequency

Postby ESP_LJH » Thu Jun 24, 2021 1:00 pm

Sorry, IO32 and IO33 could only connect to a 32.768 kHz crystal.

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