What frequency points of SMT crystal oscillators are used in automotive electronics

    Crystal oscillators act as signal sources by connecting with other components, generating pulses. Therefore, there is a vivid analogy in the electronic community: if a chip, such as a circuit, controls the brain, the signal generated by the crystal oscillator is the blood that continuously supplies and supplies the brain. Normally, crystal oscillators are present in various fields such as mobile phones, Bluetooth earphones, speakers, smart balance cars, smart homes, and smart wearables that we use. And in daily commuting cars, crystal oscillators are also used. Who would have thought that a car would use over 200 crystal oscillators? Don't underestimate these crystal oscillators, they are distributed throughout the car's key system, engine, tire pressure monitoring, in car audio and video system, reverse radar, navigation GPS, ADAS system, intelligent cockpit, car anti-theft system, automatic vehicle and other control systems. Different crystal oscillator frequencies have different applications and functions in the system, depending on the operational and performance requirements of the equipment.

4MHZ: Basic control systems such as automotive dashboard, engine control module (ECM), and air conditioning control.

8MHZ: In car multimedia device, instrument panel, in car infotainment system

10MHz: Applications that require high precision in positioning system receivers, vehicle communication equipment, etc

12MHZ: Some high-speed communication systems, such as auto drive system, on-board computer, etc

20MHz: used for high-performance data processing and communication equipment, such as high-speed Ethernet, automotive radar, etc. 24MHz: high-speed processor, automotive network communication system

32.768KHZ: Real time clock (RTC) function, providing accurate time information. This low-frequency crystal oscillator consumes low power and is suitable for low-power applications and long-term running devices,

Unlike crystal oscillators in smart homes and medical applications, crystal oscillators used in different automotive electronic systems not only have different frequency points, but also have significantly different requirements for working temperature. For example, in harsh environments such as engine compartments and tire pressure monitoring modules, the working temperature of crystal oscillators needs to be controlled at -40/125 ℃. Some car companies even need to apply them to electronic components with high temperatures of 150 ℃, which comply with the AEC-Q200 standard. The audio-visual entertainment system in the cockpit requires an industrial grade temperature requirement of -40/85 ℃.