What kind of car can make us feel safe?
At present, China's automobile industry is stepping into the "new four modernizations" era represented by ADAS & autonomy, connected, electrification and shared services. According to IHS Markit, by 2023, the total value of automotive electronic systems will be as high as 180 billion US dollars. On average, each car will use more than 500 US dollars of semiconductor devices. The applications with a large increase will come from ADAS, powertrain and infotainment respectively. Among them, ADAS ranked first with a growth rate of 23.6%.
The reason for the rapid growth of ADAS, on the one hand, stems from the fact that automobile manufacturers are committed to improving the safety of vehicles and constantly developing new technologies to help reduce road accidents and ensure the safety of internal connections of vehicles. In the past few years, with the support of high-precision electronic sensors (lasers, radars and cameras), high-speed multi-core system on chip (SOC) supporting artificial intelligence, high-speed vehicle network and other technologies, the vehicle ADAS active safety system has achieved a qualitative leap.
On the other hand, the transport regulatory agencies around the world, including China, have improved the evaluation standards in their own safety regulations and requirements, which all vehicles must comply with. All these clearly show that China's attention to the active security function of ADAS is increasing.
The driving force behind the "qualitative leap" is inseparable from the complex software and hardware processing capabilities, which are rapidly promoting the fault protection engineering design to become one of the important standards in today's automotive industry. Microchip and other automotive semiconductor suppliers have been committed to providing a wealth of MCU and automotive networking solutions to meet the iso-26262 standard automotive functional safety requirements. The above trend is reflected in the application of lidar and surround camera.
Make the "heartbeat" of lidar more stable
With the continuous improvement of the degree of intelligence and the requirements of unmanned 360 degree dead angle monitoring, the number of sensors in the car is becoming more and more. According to yole D é velopment's prediction, sensors for autonomous vehicles will continue to grow rapidly at a compound annual growth rate (CAGR) of 51% in the next 15 years. At present, there are mainly three types of sensors around the development of automatic driving: visual camera, millimeter wave radar and lidar. Each of the three technologies has its own advantages and it is difficult to replace each other.
Reliability has always been the focus of automotive manufacturers and electronic system suppliers. Compared with millimeter wave radar and camera, lidar with the characteristics of high resolution, long distance and wide viewing angle, and even can effectively identify stones and other non-metallic objects on the far road, is very necessary for automatic driving, especially L3 to L5 high-order automatic driving. MEMS oscillator provides more robust "heartbeat" for lidar which depends on precise timing.
Compared with the traditional quartz oscillator, the anti vibration ability of MEMS oscillator is improved by 5 times, the reliability is improved by 20 times, and the anti shock ability is improved by 500 times. Another outstanding advantage of MEMS oscillator is that it can maintain its frequency stability at high temperature. In addition, MEMS oscillators are compact and robust.
Both dsa11x1 and dsa11x5 produced by microchip are automotive grade MEMS oscillators and clock generators. They meet the aec-q100 standard and have excellent frequency stability (as low as ± 20 ppm) in the temperature range of - 40 ° C to + 125 ° C. they can meet the application requirements of automotive electronic temperature grade 1.
The phase jitter of these MEMS oscillators is less than 1 ps (typical value), the operating frequency range is 2.3 MHz to 170 MHz, and there are 3 industry standard compact sizes of 2.5 mm x 2.0 mm, 3.2 mm x 2.5 mm and 5.0 mm x 3.2 mm, with thickness of 0.85 mm.
Among the newly launched MEMS oscillators conforming to aec-q100 grade 1, there is an industry dual output MEMS oscillator, namely dsa2311. The oscillator is packaged in a 2.5 mm x 2.0 mm package, which can replace two crystal oscillators or other oscillators on the circuit board. The two synchronous CMOS outputs of the device range from 2.3 MHz to 170 MHz. This can not only save PCB space, but also reduce procurement, inventory and installation costs, and improve product integration.
The future of automotive connectivity
The look around camera system is a key component in many ADAS applications, including lane departure warning, parking aid, blind area monitoring, pedestrian detection and adaptive cruise control. It can provide a bird's-eye view of the vehicle environment, improve passenger safety and realize automatic driving.
One of the key components of an effective look around camera system is high-speed connection. Microchip provides automotive Ethernet equipment and inicnet Gamma The controller can be used to transmit video, data and messages on various forms of media.
According to McKinsey, automotive Ethernet will soon "rise to be the pillar of the car.". Microchip's inicnet technology supports Ethernet, audio, video and control through a single cable, thus simplifying the automotive infotainment network.
Inicnet technology can coexist with automobile Ethernet, seamlessly connect cross vehicle domain data communication based on Internet Protocol (IP), and simultaneously provide multi-channel efficient transmission of digital audio and compressed video data based on time division multiplexing (TDM). There are two different speed levels of 50 Mbps and 150 Mbps, and the bandwidth efficiency is more than 95%. Both options support ring or daisy chain, 50 Mbps via unshielded twisted pair and 150 Mbps via coaxial cable. Inicnet will become an open ISO standard in 2021.