NHS3100 RTC

fantasy — Wed, 28 Nov 2018 07:59:54 GMT

My customer used NHS3100 internal RTC with 32kHz FRO clock. There's considerable deviation for the RTC.

At room temperature, the deviation is less than 10s per two days;

If placed two boards in the fridge, where the ambient temp is about -10~-20℃, the deviation between the two boards is about 20min per day. While with sw calibration, the deviation could be reduced to several minutes.

Customer questions are:

1. Do we have the accuracy characteristic of the internal 32kHz FRO clock/ RTC?

2. Do we have ANs or suggestions to improve the RTC accuracy of wide circumstance temp range?

Re: NHS3100 RTC

Kan_Li — Fri, 30 Nov 2018 04:54:29 GMT

Hi Fantasy,

If you download the NHS3100 SDK(https://www.nxp.com/webapp/Download?colCode=RELEASE-MRA2-NHS3100-11_2&appType=license&Parent_nodeId=14476561289037125518… ), you may find the app note on this topic in that package. Please refer to the following for more details.

Hope that helps,

Have a great day,
Kan

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