How to Deal if the Crystal Oscillator does not Oscillate? 晶振不起振怎么办？晶诺威科技解释如下：

The crystal oscillator is a commonly used clock source in electronic equipment, which is often used to provide a stable clock signal. However, sometimes the crystal oscillator may encounter a problem of not oscillating, causing the device to fail to work normally. Then how should we judge the reason why the crystal oscillator does not oscillate and solve it in time?

晶振是电子设备中常用的时钟源，常用于提供稳定的时钟信号。但是，有时晶振可能会遇到不振荡的问题，导致设备无法正常工作。那么我们该如何判断晶振不起振的原因并及时求解呢？

一、Why does the crystal oscillator not “oscillate”? 为什么晶振不“振荡”？

1、Damaged or inferior crystal oscillators 损坏或劣质晶振

Inferior crystal oscillators may have manufacturing defects, resulting in instability. Therefore, it is first necessary to confirm whether the purchased crystal oscillators are reliable.

劣质晶振可能存在制造缺陷，导致不稳定。因此，首先要确认购买的晶振是否可靠。

2、Connection Error 连接错误

Incorrect crystal oscillator pin connections, excessively long lines, or loose connections may affect the oscillation of the crystal oscillator.

晶振引脚连接不正确、线路过长或连接松动可能会影响晶振振荡。

3、Environmental interference 环境干扰

Strong electromagnetic fields, radio frequency interference and other interference environments may affect the oscillation of the crystal oscillator.

强电磁场、射频干扰等干扰环境都可能影响晶振起振。

4、Unstable power supply voltage 电源电压不稳定

If the power supply voltage is unstable, it is likely to affect the oscillation of the crystal oscillator.

如果电源电压不稳定，很可能会影响晶振正常振荡。

二、How to Solve the Problem? 如何解决晶振不起振的问题？

1、Check the Crystal Oscillator Connection 检查晶振连线

Ensure that the pins of the crystal oscillator are correctly connected and the connection lines are short and secure. You can use an oscilloscope to monitor the waveform at the crystal oscillator pins.

确保晶振引脚正确连接，连接线短且牢固。您可以使用示波器监控晶振频率引脚上的波形。

2、Replace with a High-Quality Crystal Oscillator 更换为优质晶振

Select a reputable, certified brand of crystal oscillator, and avoid using low-quality ones.

选择信誉良好、经过认证的晶振品牌，避免使用劣质晶振。

3、Shielding and Isolation 屏蔽和隔离

When designing the circuit, it is necessary to consider the environmental interference factors and take shielding measures or isolate the crystal oscillator circuit to reduce external interference.

在设计晶振电路时，需要考虑环境干扰因素，并采取屏蔽措施或隔离晶振电路，以减少外界干扰。

4、Stable Power Supply 稳定的电源

Ensure the stability of the power supply voltage. Power management devices such as voltage regulators can be used to maintain a stable power supply.

确保电源电压的稳定性。电源管理设备（如稳压器）可用于保持稳定的电源供应。

5、Add Load Capacitance 添加负载电容

Adding a suitable load capacitor between the pins of the crystal oscillator can help improve the start-up and stability.

在晶振引脚之间添加合适的负载电容有助于改善晶振的启动性能和稳定性。

6、Adjust the Peripheral Circuit 调整外围电路

Adjust the circuits around the crystal oscillator according to the crystal oscillator manufacturer’s recommendation, such as capacitors, resistors, etc., to ensure proper start-up conditions and oscillation stability.

根据晶振制造商的建议调整晶体振荡器周围的电路，如电容器、电阻器等，以确保适当的启动条件和振荡稳定性。

7、 Oscilloscope Test 使用示波器测试

Use an oscilloscope to monitor the oscillation waveform of the crystal oscillator pin to identify whether there is any abnormality.

使用示波器监测晶振引脚的振荡波形，以确定是否存在任何异常。