embedded - RTC calibration in energy meter IC 71M6541F -


how calibrate rtc of energy meter ic 71m6541f?

here details:

i working on above mentioned soc on smart meter project. using 32.768 khz frequency getting accurate time without mismatch global time. in crystal there small deviation undergoing 2 4 second difference in real time in 24 hours of time. how rectify problem?

the problem affordable crystals have deviation. typical values 30 ppm.

and each crystal has own deviation need calibrate each system or need external sync mechanism.


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