Nowadays, with the recovery of demand in the Western auto market and the continuous increase in the number of vehicles in developing economies, fuel consumption and pollution are increasing. Governments and manufacturers are actively exploring ways to improve fuel economy to save energy and reduce emissions. The more electronic functions that are used, the greater the proportion of semiconductor components in vehicles. Faced with the dual challenges of environmental protection and a rich consumer experience, semiconductor manufacturers are leveraging their technical expertise to develop a variety of automotive-compliant solutions.
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The Challenge of Automotive Applications The automotive electronics market has always been one of the key applications in the semiconductor industry. Today's cars are no longer just a means of transportation. The need for safety, comfort and multiple functions makes the cost of electronic products in the entire vehicle. constant increase. In recent years, the continuous double-digit growth momentum of the Chinese auto market has attracted the attention of semiconductor manufacturers.
However, the devices used in automotive applications are different from the requirements of common industrial applications and are more difficult to meet. Due to the special nature of automotive applications, the electronic products have a great impact on the safety and reliability of the whole vehicle. Therefore, for electronic component manufacturers, on the one hand, they should pay more attention to reliability and other indicators in product design and manufacturing. Certification, on the other hand, requires suppliers to strictly control the screening of parts and components to ensure that the supporting products meet the requirements of reliability and performance.
ON Semiconductor's energy-efficient automotive semiconductor solutions are one of ON Semiconductor's key application markets, with a broad portfolio of power management, protection, processing, signal conditioning and control. These automotive-based devices are AEC-certified and production-approved (PPAP), ensuring that ON Semiconductor components meet design specifications and customers can achieve the desired level of quality. ON Semiconductor's commitment to the automotive market is not just to deliver the product, 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).
With more than 40 years of experience in providing products for automotive electronics systems, ON Semiconductor has a broad lineup of rugged and innovative energy-efficient integrated devices that help reduce emissions, save fuel, and improve lighting, security, connectivity and infotainment. power supply system. Now I will introduce the three aspects of the vehicle network, automotive lighting and engine management and powertrain.
Figure 1: The distribution of automotive electronics solutions from ON Semiconductor
1. In-vehicle network solution In-vehicle network (IVN) applications need to reduce costs and space as much as possible, while improving system stability and long-term reliability, so it is necessary to improve the integration of components. ON Semiconductor's IVN devices are numerous, including a variety of transceivers for local interconnect networks (LIN) and controller area networks (CAN). For example, ON Semiconductor's NCV7420 integrates a linear regulator and a LIN transceiver to save PCB space and provide separate power to the MCU, effectively suppressing interference from other modules to the MCU supply.
For example, ON Semiconductor's single-line LIN transceiver AMIS-30600 for IVN applications can be used as an interface between the protocol controller and the physical bus. It is especially suitable for driving LIN system buses in automotive and industrial applications, as well as standard ISO9141 systems. To reduce current consumption, the AMIS-30600 provides a standby mode. The transceiver uses I2T100 technology to integrate high-voltage analog circuits and digital functions on the same chip. It provides an ultra-secure solution to meet current IVN requirements through the infinite short-circuit protection function of fault conditions.
Recently, ON Semiconductor introduced a feature-rich native LIN transceiver NCV7321. It acts as an interface between the LIN protocol controller and the physical bus in low data rate IVN applications. The NCV7321 features excellent electromagnetic compatibility (EMC) and robust system-level electrostatic discharge (ESD) performance of up to 13 kV, eliminating the need for external ESD components and lower power consumption, making it ideal for demanding environments in automotive applications.
The NCV7321 uses ON Semiconductor's innovative I3T technology and intelligent power technology to enable high-voltage and sensitive digital technologies to coexist on the same chip. It complies with the LINv2.1 and J2602 specifications and has the same features as the AMIS-30600, but with different pinouts, providing customers with an alternative to existing LIN transceivers. The device is housed in a high-density, space-saving SOIC-8 package. Typical applications include a variety of body electronics and comfort applications such as remote door unlock receivers, window and sunroof lifts, alarms, electric mirrors and seats. Chair adjusters, as well as other functions such as electronic steering locks and tire monitoring electronic control units (ECUs).
The outstanding feature of the NCV7321 is that it maximizes the car's power-saving goals, 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 and can withstand a nominal 5 kV ESD pulse, providing powerful protection.
Figure 2: Typical LIN circuit based on ON Semiconductor NCV7321
The LIN bus transmits control device data at low rates (up to 20 kBaud), such as door locks, rearview mirrors, car seats and sunroofs, which are time critical. Each node of the LIN bus protocol uses only a single wire, minimizing wiring costs. Products supplied by ON Semiconductor comply with the US (SAE J2602-2) and Europe (LIN Physical Layer Specification Revision 2.1) standards. The NCV7321 offers a new choice for the world's leading automotive suppliers to integrate LIN into their cars. This LIN transceiver with lower power and system cost is attractive for a variety of existing and future automotive applications.
In addition, ON Semiconductor offers stand-alone CAN transceivers, and its latest generation, the NCV7340, represents the industry's leading electromagnetic performance (ESD and EMI). These devices are designed with I3T technology to provide high-reliability, high-quality components with failure rates measured in ppb.
2. Automotive Lighting Solutions Today, consumers want automotive lighting systems to offer more and more features, which requires highly integrated solutions with excellent current regulation. ON Semiconductor offers standard and custom devices for automotive lighting applications.
ON Semiconductor's full-featured high-intensity discharge (HID) (or xenon lamp) ASICs help improve the performance of headlamp systems. Compared to conventional halogen lamps, HID improves color rendering, reduces power consumption, provides longer life and higher light output. In order to support its advanced features, high efficiency HID headlight ballasts and complex control circuits are required. ON Semiconductor's HID lamp control system is a hybrid analog/digital solution with an 8-bit microcontroller or dedicated state machine that integrates a DC-DC controller with comprehensive diagnostics (overvoltage, undervoltage, temperature sensors) , battery life counter), various communication interfaces (LIN, SPI), support 35 W (D1/D2/D3/D4) and 25 W (D5) lights. 3 is a block diagram of the application specific integrated circuit.
Figure 3: Block diagram of ON Semiconductor's full-featured HID ASIC
Its integrated linear current stabilization and controller NCV7680 for automotive lighting can be used to power the combined taillights on a single chip, providing better performance and higher energy efficiency with a smaller footprint than the market. The device contains eight linear programmable constant current sources for steady current and control of automotive solid state combined taillights (RCL), supporting up to 75 mA of LED light per channel.
The NCV7680 integrates a number of features to support two brightness levels, one for parking and the other for tail lighting. Optional Pulse Width Modulation (PWM) control can also be used if desired. The system designer only needs to use an external resistor to set the output current (the overall set point). In addition, for designs that require high currents, an optional external ballast field effect transistor (FET) can be used for power distribution based on the high current required for the design. The delayed power limit reduces the drive current in the overvoltage condition. This is important for low current applications without external FETs. 
Figure 4: Block diagram of the NCV7680 brake light application
Typical applications for this device include combined taillights, daytime running lights (DRL), fog lights, central high-position brake light (CHMSL) arrays, turn signals and other external modulation applications, liquid crystal display (LCD) backlighting, lighting modules, and more. Compared to discrete solutions, the device better matches the LED output and is easy to identify faults.
ON Semiconductor is also developing the NCV786xx power ballast and dual LED driver product platform for advanced LED headlamp systems. The product platform was developed to meet the system-level requirements of driving multiple strings of LEDs up to 60 V, maintaining color temperature with PWM dimming, and controlling average current, enabling designers to control high beam and near with a system-on-chip device. Lights, daytime running lights, turn indicators and fog lights. The platform is capable of communicating with an external microcontroller (MCU), changing operating parameters, detecting LED shorts, and providing advanced system diagnostics after power-up. The first product in the series, the NCV78663, will be launched in 2011.
3. Engine Management and Powertrain Solutions Currently, approximately 80% of the world's engines are gasoline engines. Gasoline engines use direct injection and turbocharging to increase the efficiency of simple and economical engines. Gasoline engines are still the dominant force in the world in the future, but diesel engines have reached about 40% popularity in Europe and have potential for growth in North America.
Automotive electronics help increase efficiency through engine control, detection and drive. Carefully controlled key components such as fuel injectors and valves for maximum efficiency. In order to improve the control ability, it is necessary to measure and process the combustion chamber pressure in real time, which can reduce the fuel consumption of the gasoline engine by 30%.
ON Semiconductor has developed a wide range of custom and standard products for gasoline engines, bi/flexfuels and diesel engines ranging from ignition-controlled gas supply and fuel supply to exhaust gas aftertreatment subsystems. These product portfolios include: Inductive Angle Sensor Interface, Pressure Sensor Interface, Knock and Wheel Speed ​​Detection Circuits, Oil/urea and Airflow Interfaces, Vehicle Network Components, Throttle Actuator Drivers and Pre-Drivers, Electromagnetic and Piezoelectric Fuel Injection Systems , spark ignition, fans, pumps and hydraulic controls.
The fuel injection system is used to measure the amount and timing of fuel per cylinder. The fully integrated multipoint (MPI) petrol engine management system is still the most popular solution. However, gasoline direct injection systems have seen strong growth. To meet new demands, ON Semiconductor's powertrain solutions include transmission control and position detection, engine control, throttle control, oil level sensors, air flow monitoring, valve control, fuel injection control and more.
As a global leader in high performance, high reliability silicon solutions, ON Semiconductor has developed a complete automotive solutions strategy to provide ASIC-based, ASSP and discrete components to an increasing number of automotive customers. A comprehensive solution to help customers achieve energy-saving applications for body, HVAC, powertrain, safety, infotainment and LED lighting. In order to support China, the world's largest automotive market, ON Semiconductor has also established an Automotive Solutions Engineering Center in Shanghai to provide in-depth understanding and resolution of customer issues through local expertise, providing reference designs and demonstration boards to help customers optimize system cost and Performance, driving the development of new automotive products in China.
Pay attention to ON Semiconductor's official WeChat to learn more innovative and energy-efficient solutions
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