How to Find the Best Values for Crystal?如何选择晶体谐振器的最佳电气参数？

Here we will tell how to find the best values of crystal Clock mode, C1, C2 and Rs. Mostly the crystals are only choosing with their parallel resonant frequency but the design parameters are also important like frequency or temperature tolerance. The internal oscillator circuit in PIC micros is basically the parallel oscillator or resonator circuit, the capacitance values of which are mostly specified in the range between 20PF to 32 PF.

在这里，我们将告诉你如何找到晶体时钟模式C1，C2和Rs的最佳值。大多数情况下，晶体仅选择其并联谐振频率，但设计参数也很重要，如频率或温度公差。PIC微处理器中的内部振荡器电路基本上是并联振荡器或谐振器电路，其电容值大部分规定在20PF至32 PF之间。

At this range the oscillator oscillates near the closest of values of desired frequency but these values may be juggle sometimes. The FOSC parameters are used for choosing the Clock mode. Clock modes are actually used, for gain selection, lower gain is used of lower frequencies and higher gain is used for higher frequencies. It is also possible to select the higher or lower gain depends upon the need of oscillator circuit. The values of C1, C2 is selected by the load capacitance, but initially the suggested values are used that is suggested by the manufacture and the table that is provided in data sheet. Ideally the capacitor values are choosing in such a way that it should be must oscillate at the highest temperature and lowest VDD.

在此范围内，振荡器在所需频率的最接近值附近振荡，但这些值有时可能会很混乱。FOSC参数用于选择时钟模式。实际上使用时钟模式，对于增益选择，较低频率使用较低增益，较高频率使用较高增益。也可以根据振荡器电路的需要选择更高或更低的增益。C1、C2的值由负载电容选择，但最初使用制造商建议的值和数据手册中提供的表格。理想情况下，电容器值的选择方式应使其必须在最高温度和最低VDD下振荡。

If you want to know more about the crystal operation and ordering information, Genuway Technology is the best reference for you.

如果您想了解更多关于晶体使用和订购信息，晶诺威科技将为您提供最佳参考。