The characteristics and common frequency points of automotive grade crystal oscillators

Jul 09,2024
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Car grade crystal oscillator is a crystal oscillator specifically designed for use in automotive electronic systems. There are two main conditions that need to be met: first, it must pass the AEC-Q200 certification to ensure that its product quality and reliability meet the requirements of the automotive industry; second, it must comply with the ISO/ATF16949 specification, which is a zero failure supply chain quality management standard. (For more information about AEC-0200 and 169490, please refer to "Standard Interpretation: AEC-Q200 Certification and IATF16949 Certification")

AEC-Q200 certification is a quality reliability verification standard developed by the Automotive Electronics Committee (AEC) for passive components (such as resistors, capacitors, inductors, etc.) used in automobiles. This certification mainly verifies the durability and reliability of passive components in the vehicle environment, to ensure that these components can operate stably for a long time in the complex working environment of the car. The AEC-Q200 certification involves various tests, including temperature stress, electrical pressure, mechanical force, etc., to evaluate the performance of components under various vehicle operating conditions. These tests aim to ensure that the components can withstand extreme environments such as high temperature, low temperature, high humidity, and high vibration inside the car. Only components that have passed all tests can be considered to meet the requirements of AEC-Q200.

The main characteristics of automotive grade crystal oscillators:

1. Temperature stability: Car grade crystal oscillators can maintain high stability in the temperature range of -40 ℃ to 125 ℃. Due to the possibility of fluctuations in the internal temperature of a car due to the influence of external environment and vehicle usage, this temperature stability is crucial for ensuring the normal operation of the car's electronic system.

2. Vibration resistance: Vehicle grade crystal oscillators are usually able to withstand large vibrations and impacts. During driving, cars may encounter various road conditions and engine vibrations, and vehicle grade crystal oscillators can maintain relatively stable performance under these conditions.

3. Anti electromagnetic interference: There are a large number of electromagnetic interference sources in automotive electronic systems, such as engines, electronic devices, and other systems. Car grade crystal oscillators can operate normally in these strong electromagnetic interference environments, ensuring the accuracy and stability of the system clock.

4. High reliability: Vehicle grade crystal oscillators usually have high reliability and can meet the high requirements of automotive electronic systems for clock sources. Due to the fact that crystal oscillators are an important component of automotive electronic systems, their reliability is crucial for ensuring the stability and safety of the entire system.

The application guidelines for automotive grade crystal oscillators mainly involve the following aspects:

1. Choose a suitable crystal oscillator: Based on the specific requirements and specifications of the automotive electronic system, choose a crystal oscillator with appropriate frequency, stability, and other parameters. At the same time, ensure that the selected crystal oscillator complies with automotive industry standards, such as AEC-Q200.

2. Installation and wiring: Install and wire the crystal oscillator correctly in the automotive electronic system to ensure its normal operation and reduce potential interference. Follow the manufacturer's installation guidelines and recommendations, and use appropriate connectors and cables.

3. Testing and Verification: Before integrating the crystal oscillator into the automotive electronic system, necessary testing and verification should be conducted to ensure its performance and reliability. This can include temperature testing, vibration testing, electromagnetic interference testing, etc.

4. Maintenance and updates: Regularly maintain and update the crystal oscillator in the automotive electronic system to ensure its long-term stability and reliability. According to the manufacturer's recommendations and automotive industry standards, regularly inspect the performance and condition of the crystal oscillator, and replace or upgrade it as needed.

Car grade crystal oscillators are important clock source components in automotive electronic systems, with characteristics such as temperature stability, vibration resistance, electromagnetic interference resistance, and high reliability. By following the recommendations in the application guide, it is possible to ensure the correct installation, testing, and long-term stable operation of the crystal oscillator in automotive electronic systems.

The following are common application frequency points in the automotive industry:

	Package Size	Frequency point
Central control screen	3225/2016	16.0mhz/24.0mhz
No host radar	2520/2016	8.0mhz/16.0mhz/24.0mhz/27.0mhz/54.0mhz
Tire pressure detection	3225/2016	24.0mhz/26.0mhz

There are many applications of automotive crystal oscillators, such as in car charging modules for new energy vehicle electronic systems, electronic shift LCD instruments for intelligent cockpit systems, and electronic switches.

Although AEC-Q200 certification is not mandatory, it has become a recognized universal testing standard for passive components in the automotive industry. For car manufacturers and first tier suppliers, using electronic components certified by AEC020 can reduce risks. Meanwhile, for electronic component suppliers, obtaining AEC-0200 certification is a guarantee of product quality and reliability, which can improve product competitiveness and premium rates. AEC-O200 certification is an important means to ensure the quality and reliability of automotive electronic passive components, and it is also a key threshold for passive component suppliers to enter the automotive industry.