The Function of SMD5032 Chip Crystal Oscillator 8MHz in Speed Alarm Device

Speed alarm device is a speed alarm system specially developed to ensure driving safety, which is also an important embodiment of automobile intelligence. If the vehicle speed is lower than, reaches or exceeds a certain speed limit, the buzzer will automatically start and give an alarm. For example, if the vehicle speed is higher than 100km/h, it will automatically prompt that the vehicle has exceeded the speed limit.  When the vehicle speed is lower than 19H/km, the vehicle will issue a sound warning to remind the driver that the vehicle is in motion. Please pay attention to driving safety and do not drive fatigue. Another function of low-speed alarm is to automatically turn on the alarm system to prompt the rear vehicle to prevent rear end when the vehicle is driving at high speed and low speed.

As we all know, when cars and trucks are quiet, it may endanger riders and pedestrians, because they can't hear the coming vehicles behind. The European Union considers and stipulates that all new electric vehicles with four wheels need to have an acoustic vehicle alarm system (AVAs) with appropriate sound. The new regulations require that the AVAs system of a car must give warning noise when the vehicle speed is lower than 19km/h, because pedestrians are most vulnerable when the vehicle is reversing or moving at low speed. 

The specific measures are as follows:

Electric vehicle low speed warning sound device: In low speed mode, electric vehicles are not easy to detect when approaching the road.

Vehicle right turn warning sound device: When the truck turns to the right, it can prevent the pedestrian, non motor vehicle and other road users from being hit due to the large influence area of the turning and the blind area of the driver to a certain extent.

The frequency element used in the design of the speed alarm PCBA is 8mhz chip crystal resonator. Requirements of speed alarm device for crystal oscillator: high and low temperature resistance, anti-interference and high stability.

Main parameters of SMD5032 chip crystal

Frequency: 8mhz

Dimensions: 5.0 × 3.2 × 0.8mm

Frequency tolerance: ± 10ppm to ± 20ppm

Frequency stability: ± 10ppm to ± 30ppm

Working temperature (℃): - 40 ~ + 85

Load capacitance: 20pF

Insulation impedance: < 100 Ω

Drive level: 100 μ w typical

Annual aging rate: ± 3ppm / year max