Why 32.768khz

It indicates the number of repetitive processes per second in a periodic signal; in this case the advancement of the second hand by one position on the clock-face. Where does the unique standard frequency for a tuning fork crystal of 32, Hertz originate?

To understand this, you must know that the frequency of a quartz crystal depends on its shape and size. 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. 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 These oscillators use a so-called AT-cut quartz blank instead of a tuning fork crystal, so their output frequency is far less dependent on the operating temperature.

It can easily be seen that high and low temperatures cause comparatively large frequency deviations in tuning fork crystals solid lines. The curves of oscillators using AT-cut quartz blanks dashed lines , however, show much smaller errors. Its excellent frequency stability is achieved by precise temperature compensation, which is performed at multiple temperatures during the production process. Within a range of 1. The figure below shows: The frequency stability of the JSOTR is far better than the typical stability of tuning fork crystals.

This makes the JSOTR the ideal choice for applications that require a stable timing function over long periods of time. There are 1. The majority of them are inexpensive digital watches, requiring a small, 32kHz crystal.

As a result, these crystals are extraordinarily inexpensive Further, these crystals are particularly well optimized for low power. Real time clocks are expected to run such an oscillator for 10 years on a CR type cell. To get low frequency, low power, small crystals in other frequencies, you're looking at a substantial increase in cost.

In low volumes these crystals are still less expensive than even the normal or high power the 25kHz or 56kHz crystals, but cost the difference isn't large until you get into high volume manufacturing.

Choose what you need, but if you are going to produce a high volume product and can adjust your design to work with a 32kHz crystal, then there's a substantial financial incentive to do so. Python Javascript Linux Cheat sheet Contact. Why do we use