3100RTC not accurate

[xiangxuejiao00]

dear sir

   i test 3100 rtc function with SDK release_mra2_10_1_nhs3100,i use the app_demo_dp_tlogger project with the APP NHS3100 temperature logger.

i know the procedure when use the 3100 about rtc

1. when set config  the rtc will be set with Chip_RTC_Time_SetValue function (this value is phone time )
2. when i get config ,i can get the rtc value from Chip_RTC_Time_GetValue function ,(this value is time running by 3100)
3. in fact ,after running 1 day ,i get the rtc from 3100 is 2 minutes smaller than the phone time .

is there anything wrong ?why 3100 rtc is not  accurate as expect ?

[driesmoors]

Hi,

The TFRO is calibrated during production at 30ºC but only for a short time, limiting costs and accuracy. With a fixed environment and steady battery voltage, the deviation will be constant - we didn't find any significant aging effect. There is more information available in the SDK release zip file you downloaded under <SDK>/docs/AN_NHS31xx_RTC_accuracy.pdf.

Kind regards,
Dries.