Analysis of the Causes of Single Chip Microcomputer Circuit Crystal Oscillator?

2024/07/23

Encountered single chip crystal vibration is not a common phenomenon, so what are the causes of crystal vibration?

① PCB board wiring error;

② MCU quality problems;

③ crystal quality problems;

④ The load capacitor or matching capacitor does not match the crystal or the capacitor quality is problematic;

⑤ PCB board damp, resulting in impedance mismatch and can not start vibration;

The trace of the crystal oscillator circuit is too long;

⑦ There is a line between the two feet of the crystal oscillator;

The influence of peripheral circuit.

Solution, it is recommended to troubleshoot one by one as follows:

① Exclude the possibility of circuit errors, so you can compare the recommend circuit of the corresponding model microcontroller.

② Exclude the possibility of bad peripheral components, because the peripheral parts are nothing more than resistors and capacitors, and it is easy to identify whether they are good products.

③ Exclude the possibility that the crystal is a vibration stop product, because you will not only try one or two crystal.

④ Try to change the capacitor at both ends of the crystal, maybe the crystal can vibrate. Please refer to the operation instructions of the crystal for the size of the capacitor.

⑤ When PCB wiring, the trace of the crystal oscillator circuit should be as short as possible and as close to the IC as possible, so as to prevent the trace between the two feet of the crystal oscillator.

None

What are the common frequencies of crystal oscillator in computer peripheral electronic products?

Analysis of the Causes of Single Chip Microcomputer Circuit Crystal Oscillator?

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