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What is 32kHz used for on iMX8XL/DXL ?

Question asked by Chirags Patel on Apr 23, 2020
Latest reply on May 1, 2020 by gusarambula

Hello Folks, I'm working on an iMX8XL based product and wondering if we can get rid of external 32kHz crystal on RTC_XTAL pins. For instance we don't support any of the low power modes, ie iMX will either be Fully up Or Completely powered down.

 

According to ref manual, the 32kHz clock supplies the following blocks

PWM, GPT, KPP, CAAM, SYSCTR, WDOG, FlexCAN

 

If needed, can 32kHz clock be derived off of high frequency clock that's derived from external 24MHz crystal across XTAL pins (assume 150ppm for crystal tolerance across temperature)? If yes, can you provide details? What is the accuracy if derived this way?

 

Will iMX power up and run off of internal RC in absence of external 32kHz clock/crystal? Is 32kHz clock needed for powerup?

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