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Understanding IRTC clock compensation mechanism

Posted: 21 Sep 2011 ?? ?Print Version ?Bookmark and Share

Keywords:time-keeping? Independent Real Time Clock? IRTC?

Here's a document that shows the results of a study done to evaluate the compensation mechanism present in the MCF51EM256 Independent Real Time Clock (IRTC) module to achieve a clock signal. This signal is accurate down to a few parts per million of frequency drift across a temperature range of C45C to +85C.

32,768kHz crystals, commonly used in time-keeping applications, may deviate from their nominal 32,768kHz frequency due to manufacturing processes, aging, and temperature. These three factors may contribute to the crystal presenting deviations that range from the tenths of parts per million (PPM) up to hundreds of PPM. The IRTC module inside the Freescale MCF51EM256 features a clock compensation mechanism that is designed to compensate the effect of these deviations. It allows adjusting frequency drifts from as low as 0.119 PPM up to 3906 PPM.

View the PDF document for more information.

Originally published by Freescale Semiconductor Inc. at www.freescale.com as "IRTC Clock Compensation Mechanism in the MCF51EM Family".





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