Why is the real time clock frequency at 32.768KHz?

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Re: Real Time Clock

Jebakumar Samuel,
The frequency of a real time clock varies with the application. The frequency 32,768Hz is often used, because it is a power of 2 (2^15). You can get a precise 1 second perid (1Hz frequency) by using a 15 stage binary counter. This frequency is a compromise between the number of stages required to get 1 Hz and the difficulty of building lower frequency crystals (are physically large).
Regards,
Kral
 
Re: Real Time Clock

An example of Real Time Clock is the DS32KHZ, from Maxim-Dallas. It is a TCXO (temperature compensate crystal oscillator).
 

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