Nowadays, with the recovery of demand in the Western automotive market and the continuous increase in the number of vehicles in developing economies, fuel consumption and pollution continue to increase. The government and manufacturers are actively exploring ways to improve fuel economy to save energy and reduce emissions. The increasing number of electronic functions has also caused the proportion of semiconductor components in vehicles to increase rapidly. Facing the dual challenges of environmental protection and enriching consumer experience, semiconductor manufacturers are using their technical expertise to develop various solutions that meet automotive specifications.
Challenges for automotive applications
The automotive electronics market has always been one of the important application areas of the semiconductor industry. Today's automobiles are no longer just a means of transportation. The demand for safety, comfort, and multiple functions has caused the proportion of electronic products in the vehicle to continue to rise. In recent years, the strong double-digit growth in the Chinese automotive market has attracted the attention of semiconductor manufacturers.
However, the devices used in automotive applications are different from ordinary industrial applications and are more difficult to meet. Due to the particularity of automotive applications, electronic products among them have a great influence on the safety and reliability of the vehicle. Therefore, for electronic component manufacturers, on the one hand, they must pay more attention to reliability and other indicators in product design and manufacturing. Certification, on the other hand, also requires suppliers to strictly control the selection of parts and other links to ensure that the supporting products meet the requirements of reliability and performance.
ON Semiconductor's energy-efficient automotive semiconductor solutions
Automotive is one of ON Semiconductor's key application markets. Its wide range of products include power management, protection, processing, signal conditioning and control. These devices used in automobiles have passed the AEC certification and production device approval process (PPAP) to ensure that ON Semiconductor components meet the design specifications, and customers can also achieve the desired quality level. ON Semiconductor ’s commitment to the automotive market is not only to deliver products, but to ensure that manufacturing and quality meet the industry ’s requirements for reliability and robustness. In 2009, ON Semiconductor delivered more than 2.9 billion chips with a defect rate of less than 120 ppb (one billionth of a billion).
ON Semiconductor has more than 40 years of long history and rich experience in providing products for automotive electronic systems. It has a broad lineup of rugged and innovative energy-efficient integrated devices that help reduce emissions, save fuel, and improve lighting, safety, connectivity, and infotainment. power supply system. Introduce the three aspects of vehicle network, automotive lighting and engine management and powertrain.
1. Vehicle network solution
In-vehicle network (IVN) applications need to reduce costs and occupy space as much as possible, while improving system stability and long-term reliability, so the integration of components needs to be improved. ON Semiconductor has many IVN devices, including various transceivers for local interconnect networks (LIN) and controller area networks (CAN). For example, ONV ’s NCV7420 integrates a linear regulator and LIN transceiver, which effectively saves PCB board space, and can provide power for the MCU alone, effectively suppressing the interference of other modules on the MCU power supply.
Another example is ON Semiconductor's single-wire LIN transceiver AMIS-30600 for IVN applications. It can be used as an interface between a protocol controller and a physical bus. It is particularly suitable for driving LIN system buses in automotive and industrial applications. In order to reduce current consumption, AMIS-30600 provides a standby mode. The transceiver uses I2T100 technology, integrates high-voltage analog circuits and digital functions on the same chip, and provides an ultra-safe solution for meeting the current IVN requirements through the infinite short-circuit protection function of fault conditions.
Recently, ON Semiconductor introduced a feature-rich local LIN transceiver NCV7321. It can be used as the interface between the LIN protocol controller and the physical bus in low data rate IVN applications. NCV7321 has excellent electromagnetic compatibility (EMC), and strong system-level electrostatic discharge (ESD) performance up to 13 kV. It does not require external ESD components and has lower power consumption. It is very suitable for harsh environments in automotive applications.
NCV7321 uses ON Semiconductor ’s innovative I3T technology and smart power technology to enable high voltage and sensitive digital technology to coexist on the same chip. It conforms to LINv2.1 and J2602 specifications, and has the same functions as AMIS-30600, but the pin output is different, providing customers with alternative products that conform to existing LIN transceivers. The device is packaged in a high-density, space-saving SOIC-8 package. Typical applications include multiple body electronic functions and comfort function applications, such as remote door unlocking receivers, window and sunshade lifters, alarms, power mirrors and seat Seat regulator, and other functions such as electronic steering lock and electronic control unit (ECU) for tire monitoring.
The outstanding feature of NCV7321 is that it meets the vehicle's power saving goal to the maximum extent, and the current consumption in sleep mode is only 10 µA. Other key features include thermal shutdown, fuzzy short circuit protection, and 45 V load dump protection. Figure 2 shows a typical circuit based on the NCV7321 LIN transceiver. It is worth mentioning that the device supports a voltage range of -45 V to 45 V, can withstand ESD pulses rated at 5 kV, and provides powerful protection.
The LIN bus transmits the data of control equipment at a low rate (up to 20 kBaud), such as functions such as car door locks, rearview mirrors, car seats and skylights, which do not have strict requirements on time. Each node of the LIN bus protocol uses only a single wire, which minimizes the cost of wiring. ON Semiconductor's products meet the US (SAE J2602-2) and European (LIN physical layer specification revision 2.1) standards. NCV7321 provides new options for the world's leading automotive suppliers to integrate LIN into automobiles. This LIN transceiver with lower power consumption and system cost is very attractive to various existing and future automotive applications.In addition, ON Semiconductor also provides independent CAN transceivers, and its latest generation of products, NCV7340, represents industry-leading electromagnetic performance (ESD and EMI). These devices use I3T technology in their design and provide highly reliable, high-quality components with failure rates measured in ppb units.
Nowadays, consumers hope that automotive lighting systems can provide more and more rich functions, which requires the use of highly integrated solutions with excellent steady flow performance. ON Semiconductor provides standard products and customized devices for automotive lighting applications.
ON Semiconductor's full-function high-intensity discharge (HID) (or xenon lamp) application specific integrated circuit helps improve the performance of the headlight system. Compared with traditional halogen lamps, HID improves color rendering, reduces power consumption, has a longer service life and higher light output. To support its advanced functions, high-efficiency HID headlight ballasts and complex control circuits are required. ON Semiconductor's HID lamp control system is a hybrid analog / digital solution using an 8-bit microcontroller or a dedicated state machine. It integrates a DC-DC controller and has comprehensive diagnostic functions (overvoltage, undervoltage, temperature sensor) , Life time counter), various communication interfaces (LIN, SPI), support 35 W (D1 / D2 / D3 / D4) and 25 W (D5) lights.
Its integrated linear current stabilization and controller NCV7680 for automotive lighting can power a combined taillight with a single chip, providing better performance and higher energy efficiency, and its footprint is smaller than the solutions on the market. The device contains eight linearly programmable constant current sources, which are suitable for the steady flow and control of automotive solid-state combined taillights (RCL), supporting light-emitting diode (LED) drive currents up to 75 mA per channel.
NCV7680 integrates many functions and supports two brightness levels, one for parking and the other for tail lighting. If required, optional pulse width modulation (PWM) control can also be used. The system designer only needs to use an external resistor to set the output current (overall set point). In addition, for designs that require large currents, the optional external ballast field-effect transistor (FET) can distribute power according to the high current required by the design. The delayed power limit reduces the drive current under overvoltage conditions. This is very important for low current applications without external FETs.
Typical applications for this device include combination taillights, daytime running lights (DRL), fog lights, central high brake light (CHMSL) arrays, turn signal lights and other external modulation applications, liquid crystal display (LCD) backlights, lighting modules, etc. Compared with discrete solutions, the device can better match the LED output, easy to identify faults.
ON Semiconductor is also developing the NCV786xx power ballast and dual LED driver product platform for application in advanced LED headlamp systems. The product platform was developed to meet the system-level requirements of driving multiple strings of LEDs with voltages up to 60 V, maintaining color temperature with PWM dimming, and controlling the average current, allowing designers to control high beam lights and near lights with a system-level chip Lights, daytime running lights, turn indicators and fog lights. The platform can communicate with an external microcontroller (MCU), change operating parameters after power-on, detect LED short circuits, and provide advanced system diagnostics. The first product of this series, NCV78663, will be put on the market in 2011.
2. Engine management and powertrain solutions
At present, about 80% of the world's engines are gasoline engines. Gasoline engines use direct injection and turbocharging to improve the efficiency of simple and economical engines. Gasoline engines will continue to be the dominant force in the world in the future, but diesel engines have reached about 40% penetration in Europe and have growth potential in North America.
Automotive electronics help increase efficiency through engine control, inspection, and driving. Carefully controlled key components such as fuel injectors and valves can achieve maximum efficiency. In order to improve the control ability, the pressure of the combustion chamber needs to be measured and processed in real time, which can reduce the fuel consumption of the gasoline engine by 30%.
ON Semiconductor has developed a variety of customized and standard products for gasoline engines, bi / flexfuel and diesel engines, covering a wide range of applications from ignition control air and fuel supply to exhaust aftertreatment subsystems. These product portfolios include: inductive angle sensor interfaces, pressure sensor interfaces, knock and wheel speed detection circuits, oil / urea and airflow interfaces, in-vehicle network components, throttle actuator drivers and pre-drivers, electromagnetic and piezoelectric fuel injection systems , Spark ignition, fan, pump and hydraulic control.
The fuel injection system is used to measure the fuel quantity and timing of each cylinder. The fully integrated multi-point (MPI) gasoline engine management system is still the most popular solution. However, gasoline direct injection systems have experienced strong growth. To meet new demands, ON Semiconductor ’s powertrain solutions cover applications such as transmission control and position detection, engine control, throttle control, fuel level sensors, air flow monitoring, valve control, and fuel injection control.
As the world's leading supplier of high-performance, high-reliability silicon solutions, ON Semiconductor has developed a complete automotive solution strategy, designed to provide more and more automotive customers with ASIC, ASSP and discrete components based on A comprehensive solution to help customers achieve energy-saving applications in car bodies, HVAC, power systems, safety, infotainment and LED lighting. In order to support China, the world's largest automotive market, ON Semiconductor has also set up an automotive solution engineering center in Shanghai, through local professional technical support to understand and solve customers' problems in depth, provide reference designs and demo boards to help customers optimize system costs and Performance, promote the development process of new car products in China.
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