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23

2024/05

What factors can cause damage to the crystal?

1. There is a falling phenomenon in the production process, which means that only the crystal oscillator causes excessive external impact, because the crystal oscillator chip is relatively thin and needs to be handled with light.

23

2024/05

How to judge whether the crystal vibration?

1. Oscilloscope detection. Anyone who can use an oscilloscope should know all about it .... I won't go into details. (It was also said before that the oscilloscope test was not true, but the single crystal oscillator test started to vibrate. In this case, the resistance of the crystal oscillator may be relatively large, or the load of the crystal oscillator may not match the capacitance value at both ends.)

23

2024/05

Why do clocks use 32.768K crystals?

Why is there a variety of options for the external crystal of the microcontroller, and the clock crystal is 32.768K?

23

2024/05

The difference between passive crystal and active crystal?

1. passive crystal-passive crystal needs to use the oscillator in DSP chip, in datasheet. There are recommended connection methods on. Passive crystals have no voltage problem, and the signal level is variable, that is to say, it is determined according to the starting circuit. The same crystal can be applied to a variety of voltages, can be used for DSP with different clock signal voltage requirements, and the price is usually lower. Therefore, crystals are recommended for general applications if conditions permit, which is especially suitable for producers with rich product lines and large quantities. Relative to the crystal oscillator, the defect of passive crystal is that the signal quality is poor, and it is usually necessary to match the peripheral circuit (capacitor, inductor, resistor, etc. for signal matching). When replacing the crystal with different frequencies, the peripheral configuration circuit needs to be adjusted accordingly. It is recommended to use quartz crystals with high precision, and avoid using ceramics with low precision as much as possible.

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