ESP32 32Khz external crystal

vinimac
Posts: 4
Joined: Sun May 06, 2018 1:04 pm

ESP32 32Khz external crystal

Postby vinimac » Fri Sep 21, 2018 12:50 pm

Hi,

Is the external 32KHz crystal required for sleep mode to keep track of time and wake up at a specific time, and also to wakeup when a GPIO input changes? I am using ULP in sleep mode with 1 second interval and wake up the main CPU when a GPIO changes.

WiFive
Posts: 1957
Joined: Tue Dec 01, 2015 7:35 am

Re: ESP32 32Khz external crystal

Postby WiFive » Sat Sep 22, 2018 9:11 pm

No it is not required but it can improve accuracy of timekeeping

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