As people’s living standards continue to improve, awareness of security and safety precautions in the field of security has also been increasing. Xiao Kai has noticed that many places have established dynamic city surveillance and alarm networks and platforms. Practical smart security video surveillance networking alarm operation software has been well promoted in China.
Whether it’s in security, transportation, or data management, more intelligent security devices can now be found, making cities smarter, more convenient, and safer. This has driven the development of disaster early warning systems, intelligent video surveillance systems, and other technologies.
Those working in electronics know that crystal oscillators are key components to maximizing the anti-theft functions of security products, as they provide a stable clock signal for microcontrollers to function properly.
So, do you know which crystal oscillators are used in smart security? Let’s spread some knowledge today.
Common crystal oscillator frequencies used in security devices include: 12 MHz, 12.27 MHz, 13.56 MHz, 18.9375 MHz, 19.069928 MHz, 21.4 MHz, 24 MHz, 28.375 MHz, 28.63636 MHz, and 37.875 MHz.
Among these, surface mount types are most commonly used. The typical models and their frequency ranges are as follows:
- SMD2520: Frequency range 8-60 MHz
- SMD3225: Frequency range 12-60 MHz
- SMD5032: Frequency range 8-54 MHz
In security devices, the requirements for crystal oscillators are much higher than for ordinary consumer electronics. This constantly drives the production of oscillators with high stability, high precision, low phase noise, anti-interference capabilities, and wide operating temperature ranges.
For example, in smart locks, the main control chip typically uses a 27 MHz crystal oscillator, with the common package being the SMD3225. For cloud-based monitoring cameras, the most commonly used package is also the SMD3225 crystal oscillator, with three typical frequencies: 24 MHz, 25 MHz, and 32 MHz.
Crystal oscillators in smart security devices are primarily used in the following applications:
- Network Video Recorders (NVR)
- Smoke Detectors
- Burglar Alarms
- Infrared Sensors
- Electronic Fences
- Fingerprint Door Locks
- Remote Image Transmission Devices
- Terminal Monitoring
- Wireless Door Magnetic Detectors
These are the typical applications of security crystal oscillators that I’ve compiled.
Note: This article aims to provide industry insights into crystal oscillators.