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计时器校准

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The term “quartz accurate” has become a familiar phrase used to describe the accuracy of many time keeping functions. Quartz oscillators provide an accuracy far superior to other conventional oscillator designs,but they are not perfect. Quartz crystals are sensitive to temperature variations. Figure 1 shows therelationship between accuracy (acc), temperature (T), and curvature (K) for the 32,768 Hertz crystal used on STMicroelectronics TIMEKEEPER® products. The curves follow this general formula:
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