Application of Epson SG-8200CG Programmable Crystal Oscillator in Automotive Electronics Field

The application of Epson SG-8200CG programmable crystal oscillator in the field of automotive electronics mainly relies on its high flexibility, low noise, and stability. With the continuous development of automotive electronics technology, especially the application of emerging technologies such as smart cars, autonomous driving, and vehicle to vehicle (V2X), clock sources play a crucial role in ensuring accurate system synchronization, stable data transmission, and efficient operation.

一、 Advanced Driver Assistance Systems (ADAS)

1.Millimeter wave radar applications

In the millimeter wave radar system of automobiles, SG-8200CG provides high-precision clock signals for radar sensors. Millimeter wave radar detects the distance, velocity, and angle of objects around a vehicle by emitting millimeter waves and receiving reflected waves. For example, in the adaptive cruise control (ACC) function, the radar needs to accurately measure the distance and relative speed of the preceding vehicle to maintain a safe following distance.

The wide frequency range (1.2MHz -170MHz) of SG-8200CG can be programmed according to the specific design requirements of millimeter wave radar, providing suitable clock frequencies, such as setting to the specific frequency required for 77GHz millimeter wave radar. Within the temperature range of -40 ° C to+105 ° C, the frequency tolerance can be controlled within ± 15 × 10 ⁻⁶, ensuring stable and accurate operation of the radar in different driving environment temperatures of the car. Even under extreme weather conditions such as harsh winters or hot summers, radar can accurately perceive the dynamic information of surrounding vehicles, providing reliable data for the ACC system to achieve automatic acceleration, deceleration, and other functions, improving driving comfort and safety.

2.Camera system application

In the camera assisted driving system of automobiles, such as lane departure warning (LDW) and traffic sign recognition (TSR) systems, SG-8200CG plays a key role. The camera needs to capture clear road images at high frame rates, and the processing of image data requires precise clock signals for synchronization.

The low phase jitter characteristics of this crystal oscillator (such as phase jitter typically as low as 1.1ps at specific frequencies) ensure stable transmission and processing of image data. In the LDW system, the camera captures road images driven by a precise clock, and then uses image recognition algorithms to determine whether the vehicle has deviated from the lane. The stable clock signal provided by SG-8200CG ensures that the algorithm can accurately analyze images, issue timely alerts, remind drivers to correct the direction of vehicle travel, and avoid traffic accidents caused by lane departure.

二、 Automotive infotainment system

1.Car multimedia applications

In the car multimedia system, including car audio and video playback devices, the SG-8200CG provides a stable clock source for the multimedia chip. For example, when playing high-definition music or videos, a stable clock signal is crucial for decoding audio and video.

For audio playback, its high-precision frequency output ensures the sampling and restoration accuracy of the audio signal. When playing lossless music formats such as FLAC or ALAC, the stable clock of the crystal oscillator can ensure high fidelity audio, allowing passengers in the car to enjoy an auditory feast like in a concert hall. In terms of video playback, whether it's playing locally stored high-definition movies or streaming online videos, the SG-8200CG can ensure stable frame rates, avoid screen lag or tearing, and provide a smooth visual experience.

2.Car navigation application

In the car navigation system, the SG-8200CG plays an indispensable role. The navigation system requires real-time reception of satellite signals for positioning, and combines map data for route planning and navigation guidance.

The high precision and stability of crystal oscillators ensure that the satellite signal receiving module can accurately receive and process weak signals from satellites. Meanwhile, a stable clock signal ensures fast and accurate data transmission during the loading and updating process of map data. For example, when a vehicle travels to an area with weak signals, such as mountainous areas or tunnels, the navigation system can still rely on accurate clock signals received previously, combined with cached map data, to provide reliable navigation information for the driver and help them reach their destination smoothly.

三、 Automotive body control system

1.Application of window and door lock control system

In the car body control system, SG-8200CG provides clock signals for the control units of windows and door locks. Taking electric windows as an example, when the driver presses the window up and down button, the control unit, driven by the clock signal provided by the crystal oscillator, accurately controls the operation of the motor to achieve smooth window up and down.

Its frequency stability ensures that the car window does not suddenly stop or shake during the up or down process. For the car door lock system, whether operated through the remote key or the door lock button inside the car, the SG-8200CG can ensure precise control of the lock cylinder motor, achieving fast and safe door lock opening and closing functions.

2.Application of Automotive Air Conditioning Control System

In the automotive air conditioning system, SG-8200CG provides clock signals for the air conditioning controller. The air conditioning controller adjusts parameters such as the speed of the air conditioning compressor, the speed of the fan, and the direction of the air outlet under precise clock control based on feedback data from temperature sensors, humidity sensors, and other sensors inside the car.

For example, in automatic air conditioning mode, when the temperature inside the car rises, the controller, driven by the clock signal of the crystal oscillator, accurately increases the cooling capacity to quickly restore the temperature inside the car to the comfortable set value. This precise control not only improves the comfort inside the car, but also reduces energy consumption and extends the lifespan of the car battery (for electric vehicles) by optimizing the operation of the air conditioning system.