Automotive electronics and intelligent network is moving in the direction of the development of electronic control devices through the CAN bus, providing a stable, reliable, low-cost network connectivity; motors, switches, sensors and lights, glue stick etc. through the local interconnect network (LIN) to network connection.
Freescale is the world's leading vendor solutions include: 8-bit 908MCU based on the CAN / LIN bus door control program, light control options, CAN / LIN network solutions; to 9S12C3216 bit controller LIN master controller steering wheel, light switch , glue gun air-conditioning fan control (LINSlaveHVACBlower), air damper (LINSlaveHVACDamperDoor) and instrumentation (LINSlaveCluster) and so on.
Automotive network technologies.
Car manufacturers and tier suppliers face increasingly complex security, powertrain, chassis and body systems harmonization issues. Such as wire, collision avoidance, driver assistance systems such as the emerging need a predictable and reliable way to provide high data rate networks. MOST can support high data rate, however, is the networking standard for connecting car multimedia design. CAN network can connect several ECU, and the usual data rate of only 125k ~ lMbps.
In addition, CAN is also used for message transmission priority arbitration, which means that low priority messages are always in the news of high-priority transmission, only the highest priority messages to be transmitted guaranteed. Relatively low data rates and fault tolerance so that CAN can not adapt to the lack of more advanced applications (such as by-wire system), and LIN essence is used to connect a CAN of cheap and relatively slow sub- network, it can not reach the next generation of advanced vehicle safety systems used in the required data rate.
FlexRay protocol in a high-speed, deterministic fault-tolerant communication technology to meet these needs. FlexRay network design for the car, it will not replace any existing network, but with a mature system has been used in conjunction with, such as controller area network (CAN), Local Interconnect Network (LIN) and Media Oriented Systems Transport (MOST .) FlexRay can control the advanced electronic security systems, such as wire braking and steering wire. FlexRay technology is a deterministic dual-channel architecture, the total per channel data rates up to 10Mbps. Since the two channels are run independently, so the total data rate of up to 20Mbps, CAN network at least 20 times the data rate. Uncertainty means that does not rely on any opportunities. By the time-triggered FlexRay, and fully predictable, without any outside influence. It requires consistent, reliable high-speed performance of the absolute security of critical applications.
Vehicle safety.
Auto safety is a major integrated circuit designers face challenges. New more intelligent automotive safety systems and automation, and technical challenges have become more critical. For example, the airbag system is a single from the initial use of the driver's side of the system gradually evolved. Freescale has a wide range of senior acceleration sensor and associated control technology, can provide more sophisticated airbag systems, including front and side impact protection, and other head and knee protection.
The tire pressure monitoring system (TPMS), for example, a direct tire pressure monitoring systems require very long battery life, usually 7 ~ lO years. Since the battery is located inside the tire, so the heavy battery is not in the list of options and must seriously consider the measurement and transmission frequency. In addition, low-power components must be selected. Tire environmental exposure to air for electronics and silicon pressure sensor is very demanding, medium protected the viability of the product and thermal characteristics are also very important.
Freescale's tire pressure monitoring solutions MPXY8300, which consists of capacitive pressure sensor, temperature sensing components, MCU, RF, acceleration sensors and the interface with wake-up circuit, all integrated in a chip. The chip is mounted on Freescale's ultra-small package (SSOP) in. SSOP size and enhanced protection capabilities make the media or tire valve installed on the tire pressure monitoring system (TPMS) Remote sensing module the ideal packaging solution.
Advanced infotainment system.
Emerging display technology with advanced infotainment systems to automotive electronics gradually into the dashboard of advanced information and entertainment center. Driver Information System (DIS) and telematics technologies are increasingly reflected in consumer electronics and automotive electronics industry integration. Mobile phones, pagers, PDA, Bluetooth connectivity, WEB server, global positioning system (GPS), game systems and other personal communications and productivity tools are available through existing automotive electronics systems integration, and more and suitable for automotive applications. At the same time, the car manufacturers but also for new design challenges.
Because of different communication standards, different electrical requirements, hardware and software platforms, the car environment is very demanding, but also must be compatible with the vehicle's existing network, so designers need to meet all these criteria.
Freescale offers a scalable platform to meet the instrument hardware and software requirements of infotainment systems, and these requirements will differ from vehicle manufacturers and in different regions and different, including the use of Amadeus media processor for portable and automotive R & D MP3 audio solutions Based PowerArchitecture the mobileGT platform Telematics / infotainment programs, and multi-channel surround sound audio programs OnyxDSP.