Bluetooth is a radio technology that supports short-distance communication between devices. The distance is generally within ten meters. Its uses include wireless information exchange between wireless headsets, notebook computers, mobile phones, speakers, PDAs and other related peripherals. The use of Bluetooth series can effectively simplify the communication between mobile communication terminal devices, and also successfully simplify the communication between the device and the Internet, making data transmission faster and more efficient, and broadening a path for wireless communication ! It is an open global specification for wireless data and voice communication. It is not just a simple technology for mobile phones and even the entire IT, but a concept. It can put aside the traditional connection shackles and let people thoroughly enjoy the unrestrained fun. This kind of convenience cannot be satisfied by other facilities and technologies.

The chip crystals that Bluetooth crystals can use have commonly used frequencies: 3225 12MHZ, 3225 16MHZ, 3225 24MHZ, 3225 26MHZ, 3225 32MHZ, etc., but the 2520 package is not very commonly used. Generally, the more commonly used is 3225 26M, this package frequency The supply of crystal oscillators is relatively sufficient. It is also the crystal most frequently supplied by manufacturers and suppliers. Bluetooth crystal oscillator load capacitance has 7PF, 9PF, 12PF, 20PF, among which 9PF load is the most extensive. Frequency accuracy (frequency error) is also a very important parameter for crystal oscillators. There are currently three frequency errors of ±10PPM, ±20PPM and ±30PPM in the market. ±10PPM is the most stable and reliable. The error relative to 30PPM has a certain price. The difference is that the general manufacturers will choose the crystal oscillator with 10PPM error. I believe that we all know something about the Bluetooth crystal oscillator, but many people are confused. If the Bluetooth crystal oscillator is broken, we can replace it, but if it does not vibrate, what is the cause What? How to solve the problem that the bluetooth crystal does not vibrate? This question can actually be summarized as the following:

1. Firstly, check whether the various working voltages and key control signals of the chip are normal, especially reset. Check the power-on current to see if it is normal.

2. If the standby current is normal, let the software RUN to check whether the operating current of the signboard is normal. If it is a small 4-layer board, it is likely that the crystal oscillator or the IC of the csr is soldered. Then you need to take an X-ray. The BGA on the PCB board has many false soldering, so the production process needs to be changed and laser holes are changed.

Looking at the knowledge aroused by a little Bluetooth, we have to sigh. The university question contained in a little thing is beyond us. Both its convenience and technology have to be convincing. The applicable range of this small Bluetooth is also extremely wide. It can be applied to both laptops and mobile phones. You can also wear a Bluetooth headset when driving, which brings safety and convenience to many people. Bluetooth can also be applied to entertainment. We can transfer pictures, ringtones or files to each other, and Bluetooth provides our convenience for this. For this reason, the countless small parts that make up Bluetooth are indispensable, and quartz crystal oscillator (ie: quartz crystal resonator) is one of them. Whether it is the spread of technology or the popularization of Bluetooth, it has led the electronic products to gradually move towards high technology and convenience, and guide us to develop more technologies that are conducive to people's lives.