Why 32.768 khz crystal

Watch crystals with a frequency of Built into the watch, its original frequency is split using so-called T-flipflops or ripple counters. Each T-flip-flop can halve the frequency of the quartz.

If 15 of these T-flipflops are connected in series, the output frequency of Thus, the frequency of the classic Tuning fork crystal is ultimately the result of a simple arithmetic operation and the general conditions of quartz production. Several decades passed before the quartz watch finally found its way into the mass market.

In , the Japanese company Seiko launched the first commercially available quartz wristwatch on the market. However, the cost of , Yen was equivalent to that of a small car. At that time, Jauch also seized the opportunity and built up its own trade- and production-network for tuning fork crystals and further frequency control products.

However, Jauch is also offering a wide range of oscillators with the tuning fork-frequency of I should be interested to know more about the one you refer to. The first commercially available quartz watch for industry and science was developed by the Physikalisch-Technische Entwicklungslabor Dr. Rohde und Dr. The CFQ quartz watch was launched on the market in Do you have any idea what metal the tuning fork is coated with along its surface?

I found what you have written interesting. Frequency control products with the characteristic frequency of However, designing the circuits requires accuracy in order to ensure reliable function of the components. For example, special care must be taken to ensure that the load capacitors are correctly matched.

This rail-to-rail output enables a very easy connection to all common microcontrollers and RTC devices. The JRO32 It uses a tuning fork crystal inside and is therefore characterized by a particularly low current consumption. Furthermore, it can be operated with a variable operating voltage between 1. Due to the use of a tuning fork crystal, its output frequency depends on the operating temperature to a large extent.

The above-mentioned correlation between output frequency and operating temperature speaks for the use of the Jauch-oscillators JO22 and JO32 Economies of scale dictate that they will always be cheap - a few pence in most cases. So finally, it boils down to what is cheaper and practical to use. And because we had been using Otherwise, given an option, I would have liked to use a XTAL with lower frequency so that accumulated error becomes smaller. It doesn't quite work like that. The lower the frequency, the more difficult it is to get crystals and the frequency tolerance is poor.

Try getttng a 1kHz crystal Obviously the ideal is a 1Hz crystal, but it would be quite large and the load capacitors would be large. What is a fact is that the lower the frequency, the lower the power consumption. The accumulated error in a real-time clock depends only on the accuracy of the crystal frequency in percent or parts per million. There is no reason to believe that a frequency lower than As crystals go, the In many applications, particularly digital watches, the current consumption has to be as low as possible to preserve battery life.

Re: Why The measure reason for this is the relation between the frequency and the size of the crystal Since they are inversely proportional to each other, lowering the crystal will increase the size of the crystal Best Regards, Sumit.

Note, the question was asked 11 years ago, and the person who asked it has not visited this board for over four years.