Consumer electronics chips and automotive-grade chips have significantly different design considerations, resulting in substantial differences in their manufacturing processes. So, what are the differences between automotive-grade chips and consumer electronics chips? Let's take a look.
I. Automotive-grade chips and consumer electronics chips have different focuses
1. Mobile phone chips: In the world of martial arts, speed is the only way to win.
Whether it's smartphones, tablets, set-top boxes, or smart wearable devices, the development of consumer electronics chips primarily considers three dimensions: performance, power consumption, and cost. In the smartphone era, chip performance has become a crucial indicator of a device's quality. Whether it's playing high-stakes games like Honor of Kings or PUBG Mobile, a more powerful CPU chip is essential for delivering the ultimate gaming experience.
When billions of transistors on a single chip operate at high frequencies, they generate significant dynamic power consumption, short-circuit power consumption, and leakage power consumption. If left uncontrolled, this can lead to calculation errors and even fuse parts of the circuit together, rendering the chip irreparable. Therefore, while pursuing performance, consumer electronics must also consider power consumption; otherwise, the device will easily overheat, resulting in shortened standby time and a negative impact on the user experience. As chip performance becomes increasingly powerful, chip prices are also rising, and their proportion of the total cost of a mobile phone is increasing.
2. Automotive chips: Stability is paramount.
Due to the unique nature of automobiles as transportation tools, automotive chips place paramount importance on reliability, safety, and longevity. Why is reliability prioritized? Because automotive-grade chips face several challenges: First, the working environment in automobiles is far harsher. Engine compartment temperatures range from -40°C to 150°C, requiring automotive chips to operate within this wide temperature range, whereas consumer chips only need to operate within 0°C to 70°C. Furthermore, automobiles experience significantly more vibration and impact during operation, and the humidity, dust, and corrosion present in the automotive environment far exceed the requirements for consumer chips. Second, automotive products have a longer design lifespan. Mobile phones have a lifespan of 3 years, at most 5 years, while automotive design lifespans are generally around 15 years or 200,000 kilometers, far exceeding the lifespan requirements of consumer electronics. Therefore, automotive chips require a product lifespan of over 15 years, with supply cycles potentially reaching 30 years.
In this context, maintaining chip consistency and reliability is the primary concern for automotive-grade chips. Furthermore, the security of automotive chips is paramount, encompassing both functional safety and information security. While a mobile phone chip crashing can be restarted, a malfunctioning automotive chip could lead to serious safety incidents, which is completely unacceptable to consumers. Therefore, from the initial architecture design stage, functional safety must be a crucial element of automotive-grade chip design. This involves employing independent security islands, and implementing ECC and CRC data verification in critical modules, computing modules, buses, memory, and more. The entire manufacturing process utilizes automotive-grade chip manufacturing processes to ensure the functional safety of automotive-grade chips.
II. Automotive-grade chips and consumer electronics chips use different manufacturing processes.
In the chip manufacturing process, reducing the distance between internal circuits allows for the packing of more transistors into a smaller chip, resulting in more powerful computing performance and reduced power consumption. Therefore, from the early micrometer scale to the later nanometer scale, chip manufacturing processes have placed great emphasis on size.
In traditional automotive chip manufacturing, due to the larger space in automobiles, the demand for integration is not as urgent as in consumer electronics such as mobile phones. In addition, automotive chips are mainly concentrated in low-computing-power areas such as generators, chassis, safety, and headlight control. Therefore, automotive chips do not pursue advanced manufacturing processes as frantically as consumer electronics chips, but rather prioritize the maturity of the manufacturing process.
