The reason why the 49S crystal does not vibrate, etc. can be used to find out the problem and analyze it, and then deal with the problem.

Assuming that the crystal does not vibrate, you can try to permutate and combine the following aspects to find the links that are prone to problems. If you present the problem points and think about it, it is easier to find out the cause of the inability to vibrate.

1. Crystal oscillator power

We all know that the quartz crystal oscillator is a passive component, and it will work normally only when the IC provides a certain amount of encouraging power. Therefore, this inspiring power is an important part of the branch. If the inspiration power is too low, the crystal oscillator is not easy to generate a signal, and it is not easy to oscillate. However, if the invigorating power is too high, it will constitute over-inspiration, which will easily cause damage to the quartz chip and cause the phenomenon of vibration stop. To deal with the failure of the crystal oscillator to vibrate, at least the following three factors must be taken: the three factors of the oscillation frequency (frequency matching), the oscillation margin (negative impedance) and the encouragement power are suspended from the test.

2. The brand and load capacitance of the crystal oscillator

The load capacitance is very important. The load capacitance refers to the sum of all the effective capacitances inside and outside the IC block connected by the two leads of the crystal oscillator. The brand of the crystal oscillator is also one of the factors that cannot be weighed against the vibration. The original genuine crystal brand is relatively guaranteed. For example, EPSON clock chip RX8010SJ

3. The crystal pin is connected to the central type

The shell of the crystal oscillator is metal. When packaging, the pad can be made into a mechanical pad and suspended, and the top of Vanke can be fixed with a wire and grounded (grounding is mainly to prevent electromagnetic interference of the circuit, because some circuits are not reasonable when wiring. It is easy to cause electromagnetic interference and cause problems with the crystal oscillator)

Shenzhen Aoyuda Electronics Co., Ltd. is a high-tech enterprise specializing in consumer sales-quartz crystal oscillators, resonators, active clock oscillators, acoustic watch crystal oscillators, and clock crystal oscillators. The company has a full set of first-class production equipment and testing instruments from Japan and the United States, with a monthly output of up to 30 million pieces. Product features: high precision, small tolerances, drop resistance and high temperature resistance...

4. Reduce the heating time during crystal welding

Check whether the welding temperature of the crystal oscillator is high, which constitutes the second damage to the crystal oscillator. Generally, the welding temperature is required to be around 250 degrees or lower, and the maximum temperature should not exceed 300 degrees. Assuming that these are within the scope of the request, then we have to think about other reasons.

5. Use active crystal oscillator

It is best to use an active crystal oscillator. Active crystal oscillators are all built-in circuits, so there is no circuit matching problem, which greatly prevents the occurrence of the problem of the crystal oscillator not being able to oscillate. This is one of the best ways to deal with the problem of non-vibration of the crystal oscillator!