ESP32 Forum

Hi,there
I use external 32.768KHz crystal as rtc clock.It's Cl is 9pf and Rl is 35Kohm.
Most of ESP32 take 2-3s to work,but some ESP32 32.768Khz don't work.

What's crystal parameters?

Thanks in advance for your help!

Hi PaulShaw,

What about the driving level of the 32.768kHz crystal that you use?

The rtc_clk.c can be used to adjust the drive strength, but this file will only be included in our next version of IDF.

Currently, you can apply rtc_clk.c by sending e-mail to our FAE.

Thanks.