Epson Crystal Vibration Coding Rules and Type Recognition
Release date:2018-12-18 Author:Guan Shuo Click:
There are at least three popular codes of EPSON crystal oscillator in the market. They are the new code of crystal oscillator model used in the Chinese market, the discarded code of crystal oscillator model used in the North American market and the product code.
The same Epson crystal oscillator corresponds to three coding rules. Some purchasing engineers and design engineers may have some doubts. What kind of naming rules should be registered in ERP? Epson Jingzhen answers for you.
1. The North American market model name rule is an old naming method, mainly based on the market situation decades ago. At that time, the market demand for electronic components in the United States was large, and the standard frequency was relatively small. Its coding features are as follows:
A. The frequency value is accurate to 4 decimal places; for example, 32.7680k table is used in the frequency coding of 32.768KHz crystal oscillator;
B. Is the unit of frequency value expressed in K or M kHz or MHz?
C. Indicating the number of crystal oscillations in braided packaging by a single number
D. Replacing parameters with letters
E. Temperature drift with working temperature and its temperature range (frequency-temperature characteristics)
The following figure is a query table for the meaning of the letter indicating the load capacitance of Epson crystal resonator.
2. The current new Epson crystal oscillator coding (model name method) rules are mainly that the coding rules of quartz crystal resonators differ greatly, while the naming rules of active crystal oscillators differ slightly.
A. After the decimal point of the frequency value, it is accurate to 6 bits. For example, 32.768 kHz is 32.768 000 khz, and 8 MHz is 8.0000 MHz.
B. Frequency unit kHz or MHz is no longer abbreviated.
C. Crystal resonators are only programmed into standard frequency deviations at 25 C, and do not show the temperature coefficients in the whole operating temperature range in the crystal oscillator model.
It should be noted that the above two types of coding methods differ greatly in passive crystal oscillator coding rules, while the difference is small in active crystal oscillator coding rules, mainly reflected in the format of digits after decimal point and whether the frequency unit is abbreviated.
3. EPSON crystal oscillator product code (material number/order code)
From the above naming rules of crystal oscillator model, it can be seen that the difference of all technical parameters of the model can not be fully reflected by the model alone.
For example, the standard model: TSX-3225 24.00000 MHZ 9.0+10-10, the frequency temperature characteristics of this model may be 15 ppm, 20 ppm and so on, the working temperature may also be industrial grade (85 C), wide temperature level (105 C), and the number of packages is not clear. Epson factories also need to distinguish some of the details of customer requirements in production, so the product code of 15 came into being as the times require. This code is called crystal number inside Epson. At the same time, the purchasing engineer ensures that the parameters of each batch are exactly the same. It is more troublesome to add additional notes after making the model, so the product code is also used as the order code.
Compared with model coding rules, the advantage of 15-bit product coding is uniqueness, and the parameters corresponding to each material number are slightly different. It should be noted that EPSON crystal material number (product code)
The disadvantage of crystal oscillator material number is identifiability check. The detailed parameters of crystal oscillator material number can not be seen directly from the material number itself.