Automotive electronics is moving in the direction of networking and intelligence. Electronic control devices will provide stable, reliable, low-cost network connectivity via CAN bus; motors, switches, sensors and lights are routed through the Local Interconnect Network (LIN). Internet connection.
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The world-famous Freescale solutions include: CAN/LIN bus door control solution based on 8-bit 908MCU, lamp control solution, CAN/LIN network solution; control of steering wheel and headlight with 9S12C32 16-bit controller LIN main controller Switch, air conditioning fan control (LIN Slave HVAC Blower), air conditioning damper (LIN Slave HVACDamperDoor) and instrumentation (LINSlaveCluster).
Automotive network technology
Automakers and Tier 1 suppliers face increasing complexity in the coordination of safety, powertrain, chassis and body systems. Emerging systems such as wire control, collision avoidance, and assisted driving require a network that delivers extremely high data rates in a predictable and reliable manner. MOST supports high data rates, however, its network standard is designed to connect to in-car multimedia. The CAN network can connect several ECUs, and the usual data rate is only 125k ~ lMbps.
In addition, CAN also uses priority arbitration for message transmission, which means that low-priority messages are always transmitted after high-priority messages, and only the highest-priority messages can be guaranteed. The relatively low data rate and lack of fault tolerance make CAN unable to adapt to higher-level applications (such as wire-based systems), while LIN is essentially a cheap and relatively slow-speed sub-connector for connecting CAN. The network, which does not meet the data rates required for advanced security systems used in next-generation vehicles.
The FlexRay protocol addresses this need with a high-speed, deterministic, fault-tolerant communication technology. Designed for in-vehicle networking, FlexRay does not replace any existing network, but works with established systems such as Controller Area Network (CAN), Local Interconnect Network (LIN), and Media Oriented System (MOST). ). FlexRay controls advanced electronic safety systems such as line-controlled and line-controlled steering systems. FlexRay technology is a deterministic two-channel architecture with a total data rate of up to 10 Mbps per channel. Since both channels operate independently, the total data rate can reach 20 Mbps, at least 20 times the data rate of the CAN network. Certainty means that you don't rely on any opportunities. FlexRay is time-triggered and fully predictable without any outside influence. This is critical for safety applications that require consistent, absolutely reliable high-speed performance.
Car safety
Automotive safety is a major challenge for IC designers. New automotive safety systems are becoming more intelligent and automated, and technical challenges are becoming more severe. For example, the airbag system evolved from a single driver-side system that was originally adopted. Freescale's extensive mid- to high-end accelerometers and associated control technology provide a more sophisticated airbag system, including front and side impact protection and other head and knee protection.
Taking the tire pressure monitoring system (TPMS) as an example, a direct tire pressure monitoring system requires a very long battery life, typically 7 to 10 years. Since the battery is located inside the tire, bulky batteries are not available and the frequency of measurement and transmission must be carefully considered. In addition, you must choose a low power component. The environment inside the tire is very demanding for electronic products exposed to the air and silicon pressure sensors. Media protection is also important for product viability and thermal properties.
Freescale's tire pressure monitoring solution, the MPXY8300, consists of capacitive pressure sensing components, temperature sensing components, MCUs, RF, accelerometers, and interface circuits with wake-up functions, all integrated on a single chip. The chip is housed in Freescale's ultra-small package (SSOP). SSOP's size and enhanced media protection make it an ideal packaging solution for tire pressure monitoring system (TPMS) remote sensing modules mounted on the valve or tire.
Advanced infotainment system
Advanced infotainment systems with emerging display technologies are transforming automotive electronics dashboards into advanced information and entertainment centers. Driving information systems (DIS) and telematics are increasingly reflecting the convergence of the consumer electronics industry and the automotive electronics industry. Mobile phones, pagers, PDAs, Bluetooth connectivity, WEB servers, Global Positioning System (GPS), gaming systems and other personal communication and productivity tools can be increasingly adapted to automotive applications by integrating with existing automotive electronics systems. At the same time, these have brought new design challenges to automakers.
Due to different communication standards, different electrical requirements, different hardware and software platforms, the interior environment requirements are very demanding, and must be compatible with the existing network in the car, so designers need to meet all of these standards.
Freescale offers scalable instrumentation hardware and software platforms that meet the requirements of infotainment systems that vary by car manufacturer and region, including portable and automotive MP3 audio solutions developed with Amadeus media processors Telematics/in-vehicle infotainment solution based on Power Architecture's mobileGT platform, and multi-channel surround Onyx DSP audio and audio solutions.
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