The Solution of Epson Crystal Vibration Agent Passive Crystal Vibration Instability
Release date:2018-12-17 Author:Guan Shuo Click:
Passive crystal vibration is an old problem. If we do not pay enough attention to the design and selection of models, once the model is put into production in batches, there will be a great loss to the production of enterprises. Epson Crystal Vibration Agent explores this issue.
First, we have a general understanding of the problem of passive crystal oscillation.
In fact, the frequency deviation caused by the mismatch between the crystal load and the capacitance at both ends is too large. In other words, there are problems in itself, such as parasitic, large fluctuation of impedance value, improper internal solder joints and so on. Or when the crystal mounting board is not working, it is possible to use electric hot air to blow or remove it and reinstall it again. In fact, it is completely related to the frequency deviation caused by the mismatch between the crystal load and the capacitance at both ends. However, here, the electric heating wind actually plays a role in changing the stray capacitance of the line.
When operating, welding encounters welding the shell of quartz crystal oscillator on the board to achieve signal shielding and interference prevention. This result will only lead to short-circuit because the welding time is too long to melt the solder joints inside the crystal oscillator and the internal structure wafer inclines to collide with the shell. However, the best way is to have two pinholes on the PCB board and use copper wire to tie the crystal oscillator or rubber binder. The best bending is to use fingers to pinch the shell, use tweezers to clamp the lead more than 3mm from the bottom of the crystal base, and use tweezers to clamp the bending lead to 90 degrees, do not pull the lead force. Forced pulling of the lead may cause the glass at the root of the lead to break, resulting in air leakage leading to electrical performance damage. If the gas leaks, the crystal oscillator will be basically useless. Ultrasound is used to clean PCBA board because of dirt such as flux during welding. Ultrasound cleaning or ultrasonic welding will affect and damage the internal structure of quartz crystal and even damage the wafer. Crystal oscillation takes a long time to start. If the power is not switched on, it will start again. The finished batteries with large power consumption are not durable. This is mainly due to the crystal oscillator resistance is too large, low voltage crystal oscillation can not start.
In the actual operation process, the matching test of the whole crystal oscillator circuit is still difficult for many enterprises. So Epson has launched a free matching test service for end users. Terminal customers can get official technical support from Epson crystal oscillator and complete free crystal oscillator matching test report by contacting customer service and providing relevant information through Epson crystal oscillator agent-Nanshan electronic official website. A solution once and for all.