1 Reply Latest reply on Oct 17, 2017 2:28 AM by 1326259715_2076771

    RTC Calibration



      I am using an RTC component in my progect,and I want to know if there is any way to compensate for the crystal frequency error from its nominal frequency of 32.768 kHz.

      thanks first.

        • 1. Re: RTC Calibration

          The official document says:most 32.768-kHz crystals have a frequency tolerance of ±20 parts per million (ppm) at +25 °C.

          a crystal with 20- ppm error in nominal frequency can drift the clock accuracy by 52 seconds in a month.

          But now the drift is about 10 seconds only after 2 or 3 days.What could be the reason of it? Is there any solution?