What is the crystal oscillator in the watch for?

Its functions are as follows:

The clock source of microcontroller can be divided into two categories: clock sources based on mechanical resonant devices, such as crystal oscillator and ceramic resonant groove; RC (resistive, capacitive) oscillator. One is the Peirce oscillator configuration, which is suitable for both crystal and ceramic resonant grooves.

The other is a simple discrete RC oscillator. Oscillators based on crystal and ceramic resonant grooves typically provide very high initial accuracy and low temperature coefficients. RC oscillators are quick to start up and inexpensive, but are typically inaccurate over the entire temperature and operating supply voltage range, varying from 5% to 50% of the nominal output frequency.

However, its performance is affected by environmental conditions and the choice of circuit components. Careful attention needs to be paid to the selection of components and the layout of the circuit board for the oscillator circuit. When in use, the ceramic resonant groove and the corresponding load capacitance must be optimized for a specific logic family.

Crystal oscillators with a high Q value are not sensitive to amplifier selection, but can easily cause frequency drift (and possibly even damage) when overdriven. Environmental factors that affect the operation of an oscillator are: electromagnetic interference (EMI), mechanical vibration and shock, humidity and temperature.

These factors can increase changes in output frequency, increase instability, and, in some cases, cause oscillator stalling. Most of the above problems can be avoided by using the oscillator module. These modules come with their own oscillators, provide low-impedance square wave outputs, and are capable of guaranteed operation under certain conditions.

The two most commonly used types are crystal oscillator modules and integrated RC oscillators (silicon oscillators). The crystal oscillator module provides the same accuracy as the discrete crystal oscillator. Silicon oscillators are more accurate than discrete RC oscillators and in most cases can provide accuracy comparable to ceramic resonant grooves.

Power consumption also needs to be considered when choosing an oscillator. The power consumption of a discrete oscillator is mainly determined by the supply current of the feedback amplifier and the capacitance value inside the circuit. The power consumption of a CMOS amplifier is proportional to the operating frequency and can be expressed as the value of the power dissipation capacitance.

For example, the power dissipation capacitance of the HC04 inverter gate circuit is 90pF. When operating from a 4MHz, 5V supply, the equivalent supply current. Coupled with a 20pF crystal load capacitance, the entire supply current is.

Ceramic resonant grooves generally have a larger load capacitance and correspondingly require more current. In contrast, crystal oscillator modules typically require a supply current of 10mA to 60mA. Depending on the type and function, the supply current of a silicon oscillator can range from a few microamps for a low-frequency (fixed) device to a few milliamps for a programmable device.

A low-power silicon oscillator, such as the MAX7375, requires less than 2mA to operate at 4MHz. Optimizing a clock source for a specific application requires a combination of accuracy, cost, power consumption, and environmental requirements.

The specific role is....(Don't spray me if you're wrong) The crystal vibration of the electronic watch vibrates at a certain frequency Every time the electronic watch shakes for a second, it goes a little bit, which is detailed enough....Bonus points.

The role of the crystal oscillator is to provide the basic clock signal to the system. Usually a system shares a crystal oscillator to keep the parts in sync. Some communication systems use different crystal oscillators for their fundamental frequency and radio frequency, which are kept synchronized by electronically adjusting the frequency.

Crystals are often used in conjunction with phase-locked loop circuitry to provide the clock frequency required by the system.

The author of the article, Professor Zhao Shengheng of Hunan University, elaborated as follows: "Quartz crystal resonator, referred to as quartz crystal or crystal, crystal oscillator; The crystal element that adds an IC to the inside of the package to form an oscillation circuit is called a crystal oscillator. "Therefore, quartz crystal resonators and quartz crystal oscillators are two different products.

The crystal oscillator in a quartz watch is a quartz crystal resonator.

Its main function is to determine the base second time for the watch. It's the equivalent of a scale on a ruler.

A crystal oscillator is a component used to keep time.

The full name of the crystal oscillator is quartz crystal oscillator:

The above is for reference.

Hello! Your question, I think there is a problem, the full name of crystal oscillator is crystal oscillator, and its function is to generate the original clock frequency, which is amplified or reduced by the frequency generator to become a variety of different bus frequencies in the computer.

Crystal oscillator, generally known as crystal resonator, is a kind of electromechanical device, which is made of quartz crystal with little electrical loss by precision cutting and grinding and electrode plating and welding leads. This kind of crystal has a very important property, if it is electrified, it will produce mechanical oscillation, and conversely, if it is given mechanical force, it will generate electricity, this characteristic is called electromechanical effect. They have a very important feature, their oscillation frequency is closely related to their shape, material, cutting direction, etc.

Because the chemical properties of the quartz crystal are very stable, the coefficient of thermal expansion is very small, the oscillation frequency is also very stable, and the resonant frequency is also accurate because the geometry can be controlled very precisely.

According to the electromechanical effect of the quartz crystal, we can equate it to an electromagnetic oscillation loop, that is, a resonant loop. Their electromechanical effect is the continuous conversion of mechanical-electrical-mechanical-electric, and the resonant circuit consisting of inductance and capacitance is the continuous conversion of electric field-magnetic field. The application in the circuit is actually to treat it as a high-Q (and I don't understand) electromagnetic resonant circuit.

Since the loss of quartz crystal is very small, that is, the q value is very high, it can produce a very stable oscillation when used as an oscillator, and a very stable and steep bandpass or bandstop curve can be obtained when used as a filter.

According to the above information, crystal oscillators include quartz crystals, crystal oscillators are divided into passive crystal oscillators and active crystal oscillators, because passive crystal oscillators need to rely on clock circuits, so I think the crystal oscillator in the table should be passive crystal oscillator.

The crystal is actually the 32768K crystal oscillator commonly seen on the market, which is mainly used for clock signals, so it is also called the crystal crystal. According to his appearance, it is divided into 2*6 3*8It is a crystal oscillator without a chance.