At the Audi's first global brand summit held in Barcelona not long ago, Audi's new A8 flagship sedan officially launched, becoming the world's first L3-class self-driving production car. At this point, the first time the autonomous driving technology took over the steering wheel in human hands! Although Audi said that the new A8 has achieved autonomous driving only at low speeds below 60km/h, it still earns the "eyeball" of global riders. At the same time as consumers are carnival, the new A8 has further triggered consumer and industry thinking about the “reliability†of autonomous driving systems – do you really dare to take the auto-driving car?
Figure 1: Audi A8 autopilot technology uses a variety of sensors
“In fact, the essence of autonomous driving or ADAS (Advanced Driver Assistance System) is the dialogue between the car and the environment. It is realized by sensors collecting data, memory recording data, processor computing data and feedback. These processes need to be In a short period of time, in addition to high speed, the key to the key - reliability must be guaranteed!" Feng Yixin, Director of Product Management Department of Fujitsu Electronic Components (Shanghai) Co., Ltd., gave a speech at the 5th Automotive Digital Cockpit Summit Forum held recently. This is indicated. As one of the well-known high-performance memory manufacturers in the ICT industry, Fujitsu Semiconductor's ferroelectric random access memory products (hereinafter referred to as FRAM) have been successfully expanded in the market of three meters, logistics, medical and other markets. In response to customer demand in the automotive sector, the FRAM products "MB85RS256TY" and "MB85RS128TY" for automotive applications were introduced in 2017. The new product was redesigned from the internal circuit to further improve product reliability and extend the operating temperature range to minus 40 degrees. ~125 ° C, and passed the AEC-Q100 standard certification.
Small trial TPMS segment, Pirelli or will start FRAM-inside tiresAccording to US market research firm Strategy Analysis (IMS) data, the automotive electrical components market is expected to grow rapidly from $239 billion in 2015 to $303.3 billion in 2020. In China, in view of China's new car evaluation procedures (C-NCAP) will be added to the AEB and other functions in 2018, the domestic ADAS market will also usher in unprecedented growth. Therefore, IMS is also very optimistic about the scale of China's ADAS market. It is estimated that by 2020, the scale of China's ADAS market will increase from about 10 billion yuan in 2014 to nearly 80 billion yuan, with an average annual growth rate of 30%-40%.
Figure 2: China's ADAS market size and growth rate (Source: IMS)
"ADAS systems require all subsystems of in-vehicle electronics, such as sensors, cameras, CAN communications, in-vehicle HMIs, etc., to store current status information in real time and continuously for real-time monitoring, recording, analysis or processing. Under such stringent specifications, Non-volatile, high-speed write and highly write-resistant FRAM memories meet the reliability and latency requirements of autonomous driving! Therefore, as ADAS technology matures, the opportunities for FRAM in this area are increasing. The bigger the more.†Feng Yixin pointed out when facing the customer's product inquiries.
In the TPMS application of the ADAS segment, Fujitsu has taken the first step to seize the automotive application market. According to reports, Fujitsu FRAM memory has been first adopted by Pirelli tires, used in the TPMS system of the motor tires it produces, to achieve reliable low-power, high-speed writing and high-endurance data processing functions. Pirelli is one of the world's most prestigious tire companies. Pirelli tires with more than 100 years of history have become synonymous with “reliable quality†and “excellent performance†in the tire industry!
Figure 3: The high performance of FRAM meets the needs of TPMS applications
“The automotive industry is undergoing the largest transformation in history. With the new FRAM solution, we are able to support innovative companies to turn ideas into real products. We not only provide devices to customers around the world, but also provide advice on every development project based on this FRAM. Service, work with customers to overcome challenges and help them accelerate the innovation process.†Feng Yixin said. It is reported that Pirelli will use Fujitsu's FRAM with some ASICs, Sensors, etc. for SiP packaging and then apply it to tire pressure monitoring. The tire is expected to be mass-produced by the end of 2018, and will become the world's first FRAM-inside high-performance tire. The reason for winning Pirelli's favor is that: First, the battery of the tire is difficult to replace after leaving the factory. The low-power characteristics of FRAM make it advantageous in this respect. Second, the tire pressure data must be frequently written and recorded. Write once in one second, and write 320 million times in 10 years, while FRAM can support writes up to 10 trillion (1013) times, so it can be perfect in the face of high write durability challenges. response!
New energy vehicles are breaking out soon, becoming another key entry point for in-vehicle FRAMAt the same time, another hot spot in the automotive market, the outbreak of new energy vehicles, is also welcoming an important stage of the index's climb. Whether it is the major automakers, such as Tesla, Toyota, GAC, etc., have been continuously investing in the "big ambition" of self-developed vehicle batteries, or the Chinese government's policy-driven 2020, the number of new energy vehicles in China reached 500. The “small target†of Wantai indicates that the time of the new energy vehicle blowout is getting tighter and tighter.
Figure 4: 2015 new energy vehicle sales statistics, a number of Chinese car model models on the list
"The current price of BMS (Battery Management System) + battery pack in new energy vehicles is equivalent to 1/3 to 1/2 of the cost of the whole vehicle, and the proportion is very high." Feng Yixin revealed to the media, "Because of BMS and battery pack It is in a very important position in new energy vehicles, so real-time data monitoring of these units and components also requires reliable memory to record. Currently, among the leading domestic automotive companies, such as BYD, Kole, Waterma, etc. Fujitsu's outstanding FRAM products have been added to the design of new energy vehicles such as BMS."
BMS is an important link between vehicle power battery and electric vehicle. Its main functions include: real-time monitoring of battery physical parameters; battery state estimation; online diagnosis and early warning; charging, discharging and pre-charging control; balance management and thermal management. For example, the battery unit is generally maintained at between 30% and 75%, indicating normal operation. If there is an imbalance, it needs to be replenished from other units. At this time, the system needs to detect and record the battery unit's power, temperature, and voltage. , current and other data, and the time of a single monitoring record can not be too long. This means that the data recording and writing of the BMS are also very frequent, and the number of writes to the non-volatile memory is relatively high.
"In general, some manufacturers of BMS and battery packs may not use FRAM due to cost factors, but instead use E2PROM instead, but it may not really save costs." Feng Yixin explained, "They often don't realize FRAM and The way E2PROM works is very different."
Figure 5: FRAM has better durability than E2PROM
As shown in the figure above, the number of writes to FRAM is about 107 times that of E2PROM, which means that the overall capacity required by the latter is much larger under the same number of writes. Assuming FRAM is 4KB in size, although small, it allows 1013 data to be repeatedly written in the same area of ​​the entire block of memory. On the contrary, the E2PROM capacity can be much larger than 4KB, but it is limited by the number of writes (only 106 times). If the A area of ​​the whole block reaches the limit of the number of writes, the stable writing of the A area will not be guaranteed. In addition, a B area is rewritten; then the replacement process of the old and new areas requires Wear Leveling to control, which inevitably increases the software configuration cost.
Furthermore, the FRAM write speed is about 30,000 times that of the E2PROM. When a special situation such as power failure occurs, the former can write data and save it in a very short time (about 0.00015 ms), while the latter still guarantees the power-off moment. When it is possible to record data, it is often necessary to use a supercapacitor to "charge" the circuit, which is a cost overhead. Moreover, in order to reserve a sufficient number of writes, especially in applications such as BMS that frequently record data, the greater the capacity requirement of the E2PROM, the higher the cost. In other words, the cost of E2PROM is equivalent to its own capacity + capacitor + software, so there is no cost advantage compared with FRAM.
FRAM Opportunity for the Rise of China's Automobile Industry“In the past ten years, China’s automotive TIer-1 companies have accumulated a certain amount of technology from the zero accumulation of technology, and now have the strength and strength to compete with some foreign brands. This brings high-performance devices like FRAM. Opportunity.†Feng Yixin said: “If Chinese companies want to defeat their opponents or try to stand in the same position, they need to be in line with international vehicle-level standards and choose better quality and more reliable electronic components to design and manufacture. Advanced products. In fact, many industry experts have given similar views from another angle. There are too many auto-related companies in China. According to the law of development, the future must be eliminated and integrated into one. A reasonable range, and the company that can break through must be a brand with superior quality and performance!
"Fujitsu hopes to promote the upgrading of China's auto industry through the power of FRAM. We expect that the outbreak of the automotive application market will double FRAM's Asian revenue in the next year or two, and the Chinese market will occupy a larger share." Feng Yixin said "At the same time, Fujitsu is very welcoming and willing to cooperate with MCU, master control and other solution manufacturers to select FRAM products to match the total soluTIon for design in-vehicle applications, and to expand and complete the entire memory market together!"
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