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低频振荡器的使用注意事项
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2011-10-20
黄胜焱
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Many devices use a 32768 Hz crystal; following aremany reasons for choosing this frequency. First of all, itis a power of two, i.e., 32768 is the fifteenth power oftwo. If an oscillator driven by a 32768 Hz crystal isfollowed by a divide by 215 circuit, one-second ticks areobtained. Manufacturing techniques have beendeveloped to build these crystals with very highprecision. Thus, oscillators can employ these crystals todevelop one-second ticks with the same percentageaccuracy of the crystal frequency. This is why 32768 Hzcrystals are so widely used in digital watches and othertime-keeping functions.
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