(HSE oscillator circuit diagram)

STM32 晶振高速外部时钟典型应用说明

High-speed external clock generated from a crystal resonator.
晶体谐振器提供高速外部时钟源

Generally, the high-speed external (HSE) clock can be supplied with an 8 to 32MHz crystal resonator oscillator. In the application, the resonator and the load capacitors have to be placed as close as possible to the oscillator pins in order to minimize output distortion and startup stabilization time.

通常情况下，我们使用一颗标称频率为8MHz~32MHz的晶体谐振器来为芯片提供高速外部（HSE）时钟源。晶体谐振器和负载电容器的位置应尽可能靠近芯片引脚，以便最大程度降低晶振输出信号的失真度和晶振启动所需的稳定时间。

For CL1 and CL2, it is recommended to use high-quality external ceramic capacitors in the 5 pF to 33 pF. CL1 and CL2 are usually the same size. The crystal manufacturer typically specifies a load capacitance which is the series combination of CL1 and CL2， but in the application, PCB and MCU pin capacitance must be included when sizing CL1 and CL2. .

对于CL1和CL2，建议使用高质量的外部陶瓷电容器，其选值一般在在5 pF至33 pF之间。建议CL1和CL2等值。晶体制造商通常指定一个负载电容CL，但必须考虑到杂散电容，如PCB和MCU引脚电容等。因此，一般情况下，晶振规格书中标注的晶振负载电容值CL并不等于其实际外接电容值。

Please refer to us for more details on the resonator characteristics (frequency,CL,package,accuracy).

有关晶体谐振器选型及应用的更多详细信息，如（频率、负载电容、封装、频率精度等），可直接联系我司在线客户。