32.768KHZ series:
The frequency of a real-time clock varies with the application. The frequency 32768 Hz (32.768 kHz) is commonly used because it is a power of 2 (215) value. And, you can get a precise 1 second period (1 Hz frequency) by using a 15 stage binary counter.
Practically, in the majority of the applications, particularly digital, the current consumption has to be as low as possible to preserve battery life. So, this frequency is selected as the best compromise between low frequency and convenient manufacture with market availability and real estate in terms of physical dimensions while designing board, where low frequency generally means the quartz is physically bigger.
实时时钟的频率随应用程序而变化。通常使用32768 Hz（32.768 KHz）频率，因为它是2（215）的幂。并且，通过使用15级二进制计数器，您可以获得精确的1秒周期（1 Hz频率）。 实际上，在大多数应用中，尤其是数字应用，电流消耗必须尽可能低，以保持电池寿命。因此，在设计电路板时，就物理尺寸而言，选择此频率是在低频与方便制造，具有市场可用性和不动产之间的最佳折衷，低频通常意味着石英在物理上更大。
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