LPC MicrocontrollersのトピックLPC55S69 : FRO_32kHz accuracy

LPC55S69 : FRO_32kHz accuracy

EugeneHiihtaja — Fri, 20 Dec 2019 07:28:05 GMT

Hi !

On page 4 of product datasheet is written :

32 kHz Internal Free Running Oscillator FRO. The FRO is trimmed to +/- 65%
accuracy over the entire voltage and temperature range.

But later on 2% and also some range is given.

What is real FRO_32kHz accuracy ?

Regards,

Eugene

Re: LPC55S69 : FRO_32kHz accuracy

ZhangJennie — Tue, 24 Dec 2019 07:16:40 GMT

Hi Eugene

I have checked the datasheet, I can see the conflict also.

We are check it with design. I will keep you informed.

Have a nice day,

Jun Zhang

Re: LPC55S69 : FRO_32kHz accuracy

ZhangJennie — Wed, 25 Dec 2019 05:15:02 GMT

Hi Eugene Hiihtaja

This is a typo issue. The correct FRO_32kHz accuracy should be +/- 2%.

We will fix it in next datasheet release.

Thanks for bringing the problem to our attention.

Have a great day,
Jun Zhang

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Re: LPC55S69 : FRO_32kHz accuracy

EugeneHiihtaja — Wed, 25 Dec 2019 07:23:45 GMT

Hi Jun Zhang !

i think this is good answer . Looks like is not a problem to have full crystall-less clocking of this MCU.

Regards,Eugene