The integration of today's various applications is accelerating. Renesas is centered on solutions in the three frontier areas of automotive, mobile terminals and PC/AV. With its expertise in multiple fields, Renesas provides customers with development services that meet their needs. platform. In addition, Renesas also relies on its strong scientific research strength to support the cutting-edge applications in the automotive field with a rich lineup of analog devices and power devices, and to provide devices and development environments that meet world standards. As a member of FlexRay, Autosar, Jaspar and other associations, Renesas is in charge of cutting-edge technology and participating in various standardization activities with members of the world's standardization bodies.
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Renesas proposed that "the evolution of cars began with Renesas." As a result, Renesas offers powerful features, superior performance and reliable solutions in a full range of applications. For example, in car body and comfort equipment, it provides instrument panel, AFS (adapted headlight system), BCM (body control module) door, seat, electric window, wiper, air conditioner, smart key, powertrain, Engine control, transmission control, etc.; in the driver information system, provides GPS navigation, telematics, car audio, Bluetooth, etc.; in passive safety, such as airbags, TMPS (tire pressure monitoring system), ABS (anti-lock brake system), etc.; in terms of active safety, such as ACC (adaptive cruise control), laser radar, millimeter wave radar, parking assist system, etc.; in the automotive network, FlexRayx, CAN, LIN et al. These are the projects that Renesas is committed to.
First, the market share of MCU for Renesas automotive dashboard
As a well-known manufacturer of automotive electronics research and development, Renesas has been committed to pushing its core products to the global market. According to statistics, 15 OEMs around the world have adopted Renesas MCUs, including one in North America and 7 in Europe. Home, there are 7 companies in Japan. It has a global share of 18%, of which Japan is as high as 38%, as shown in Figure 1.
Second, the development trend of car dashboard
Because the general moving-coil indicator has weak points such as poor seismic performance, weak overload capability, and easy-to-joke pointers, the magnetic cross machine also has the disadvantages of consistency and poor versatility. The industry and experts are generally optimistic about stepper motor vehicles. meter.
Stepper motor meters have significant features compared to previous analog (moving or moving magnetic crossover) instruments:
High precision indication;
Consistency is better;
Reproducible and versatile;
High reliability and stability.
The next generation of automotive instrumentation will be developed in the direction of integrating large-scale image display functions and gateway functions. as shown in picture 2.
Third, the dashboard MCU product development blueprint
Renesas has prepared a series of high-quality MCU solutions for different stages of development of automotive instrumentation. From the basic H8S/2282 and H8S/2280 that meet the requirements of automotive instruments to the high-end H8SX/1544 and SH-2A, they can meet the needs of different customers. As shown in Figure 3.
Fourth, Renesas car dashboard with MCU introduction
Renesas fully considers the needs of different customers. At the low end, it introduces the basic basic H8S/228x for standard instrument panels and H8S/26xx and H8SX/154x for Hybrid. In addition to high-end, Renesas plans to offer high-performance H8SX/17xx and SH2-A in addition to H8SX/1544 and SH-2A. In addition, Renesas will also promote SH-4 and SH-4A MCU products for pure graphic display.
Renesas has always attached great importance to China's huge market. Renesas first introduced the MCU "H8S/2280" for standard display. This is based on the low-cost products developed by the existing H8S/2282. Its marketization and design work are all carried out in China, and the cost reduction is achieved by eliminating the CAN interface. In addition, the size of the LCD has also been modified according to Chinese specifications.
At present, Renesas is launching the Hybrid-oriented H8SX/154x in China, which is the instrument panel that has just been launched in Europe. It is believed that in China, which is developing rapidly in the market, the demand will increase significantly after 3-4 years.
H8S/228X is a typical automotive instrument-specific MCU with complete hardware resources. It is a single-chip dedicated MCU with 4 motor drive and 28×4 LCD liquid crystal drive. It satisfies the signal acquisition of the vehicle speed, speed, oil quantity, cooling water level, pointer indication, and calculation and display of mileage and driving computer. It is a 16-bit MCU with automotive-grade quality and high-speed computing power. With the development of domestic automotive instrumentation technology, the performance and reliability requirements of the instrument are further improved, and the design of the H8S/228X has obvious advantages.
Embedding the "Taisho Software Platform" in the H8S/228X MCU has greatly shortened the development cycle. As a general technology platform for automobiles (motorcycles), “Taisho Software Platform†should have maximum application flexibility, high reliability and high cost performance. It uses a functionally programmable configuration to complete a variety of instrument designs. That is, the setting parameters are modified by the online debugging device to meet the various functional requirements of the instrument. Such as stepper motor / cross coil selection, various styles of LCD output, adaptive matching of resistance / PWM signal source parameters, online calibration of pointer scale, etc., no need to re-program software. The H8S/228X connection diagram is shown in Figure 4.
In addition to semiconductor devices, Renesas offers simulators (E10A) and evaluation boards as development environments. In addition, in terms of standard software such as OS and CAN drivers, there is also the international standard Vector Infomatik as a strong backup. The H8S/2280 and H8SX1544 are summarized as shown in Table 1 and Table 2. The block diagrams are shown in Figure 5 and Figure 6.
In Figure 5, the description is as follows:
SCI: Serial Communication Interface
LCD: LCD display
TPU: timer pulse unit
V. Renesas Auto Dashboard Solution
In the development of automotive electronics, Renesas is not only trying to develop products, but thinking about what users think. When the initial development is in progress, they think of providing a package solution for users, such as Renesas's MCU solution, H8S/ 2282 instrument scheme, H8S/2282 instrument block diagram, H8S/1544CAN instrument scheme, H8S/1544CAN instrument block diagram, etc.
6. Cooperation with stepper motor manufacturers
Renesas and Weili have developed good technical cooperation in the field of automotive instrumentation: VID has advanced precision electromechanical technology and provides instrumentation stepper motors; Renesas is a leading supplier of MCUs worldwide, providing instrumentation microcontrollers.
Weili Drive Technology (Shenzhen) Co., Ltd. is committed to precision electromechanical products in the automotive industry, such as instrument stepper motors, clock stepper motors, motor drive chips, motor card holders, etc. Among them, VID29 series instrument stepper motor and VID69 series clock motor are widely used in automobile instrumentation, and become the brand of vehicle instrument motor commonly used in domestic applications. Their characteristics are as follows.
Features of VID29:
â— Wide voltage: 3.5 ~ 10V
â— Low power: less than 20mA, 5V
â—Working environment temperature: -40～105°C
â—Ultra-thin dimensions: Φ30mm×7.0mm
â—High precision: the step angle can be as small as 1/12°
â—Long life: using automotive grade special engineering plastic tooth design
Features of VID23:
â— Transparent pointer axis
â—High brightness
â—Maximum angular velocity: 400°/s
◠Low power consumption: 20mA, 5V, 2×100mW
â—High precision, wide temperature range, low power consumption, ultra-thin design, long life
Features of VID28:
â—Unique dual pointer independent output function
â— Operating voltage range: 3.5 ~ 10V
◠Low power consumption: 20mA, 5V, 2×100mW
â—High precision, wide temperature range, low power consumption, ultra-thin design, long life
We believe that Renesas' automotive-based instrumentation will ultimately meet the needs of users, and we will keep up with the times, follow up on the latest technology, and continue to provide core solutions.
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