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ISL12022 RTC accuracy optimization calibration procedure

Posted: 18 Mar 2009 ?? ?Print Version ?Bookmark and Share

Keywords:accuracy RTC? calibration optimization? procedure trimming?

Real Time Clock (RTC) devices contain an oscillator and normally require a crystal to operate with the required accuracy. Most commonly used 32.768kHz crystal oscillators have a frequency tolerance of 20ppm at +25C, and a nonlinear parabolic temperature drift �Alpha? of -0.034ppm/C?. Alpha is parabolic in nature, worsening as the crystal temperature deviates from the turnover temperature, referred to as T0 of the crystal, commonly +25�C.

This application note describes a simple trimming procedure, which optimizes the accuracy of an ISL12022 RTC and presents data for a variety of crystals with calibrated vs. uncalibrated.

View the PDF document for more information.

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