How to connect external 32.768K crystal

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How to connect external 32.768K crystal

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alex_li
Contributor II

We want use external 32.768k crystal as RTC clock source.How to connect it to s32k142 ?

PTA7 as RTC_CLKIN, one of PTC4,PTC5,PTD13 as RTC_CLKOUT, is it right?

We also need provide 32768Hz signal to other device,can we connect it to RTC_CLKOUT directly?

Thanks!!!

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danielmartynek
NXP TechSupport
NXP TechSupport

Hi,

It is not possible to connect a 32.768kHz crystal to the RTC module. However, you can use an external oscillator (32.768kHz) connected to RTC_CLKIN pin. This clock can be then output at RTC_CLKOUT pin for other external peripherals.

Regards,

Daniel  

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danielmartynek
NXP TechSupport
NXP TechSupport

Hi,

It is not possible to connect a 32.768kHz crystal to the RTC module. However, you can use an external oscillator (32.768kHz) connected to RTC_CLKIN pin. This clock can be then output at RTC_CLKOUT pin for other external peripherals.

Regards,

Daniel  

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alex_li
Contributor II

Daniel :

      Thanks for your explanaion!

Regards,

min li

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