Instrument panel and body control design applications
In recent years, in terms of vehicle performance, in addition to the improvement of driving functions such as driving, steering and parking, it also requires the improvement of safety, comfort and environmental protection. Although built-in microcontrollers have recently been used in many automotive systems, in order to achieve safer, more comfortable and more environmentally friendly systems in the future, it will be crucial to improve their performance and functionality.
Product Features
For safer, more comfortable and more environmentally friendly systems: Fujitsu has developed MB91770 series and MB91725 series of new microcontrollers with built-in "FR81S" dedicated 32-bit high-performance CPU cores that can control a new generation of automotive systems. Dashboard control is the main application area of ​​the MB91770 series, while body control (air conditioning, BCM, etc.) is the main application area of ​​the MB91725 series.
New built-in high-performance 32-bit CPU core "FR81S": This product uses the FR81S core, which provides 30% or more processing performance than the traditional 32-bit "FR60" CPU core. The working performance of FR81S is 1.3MIPS / MHz. As a microcontroller for automotive applications, it provides extremely high processing performance. It also has a built-in single-precision floating-point arithmetic unit (FPU), which can meet the requirements of image processing systems and those systems that require floating-point operation functions (such as brake control). Although today's traditional products without FPU still require arithmetic methods such as fixed-point arithmetic, this product has hardware support, so it can simplify software programs and improve arithmetic performance.
Product appearance
CAN controller with 64 built-in message buffers: Recently, there are a large number of built-in ECUs in the car's CAN network; their scale continues to expand as the number of nodes increases. Although the traditional 32-bit CAN microcontroller mainly has 32 built-in message buffers, this product has 64 built-in message buffers, which can support a system with a large number of nodes. And, it also supports ver.2.0A / B as CAN protocol and bit rate up to 1Mb / s.
A variety of peripheral functions can be connected through the switchable serial interface and LIN-UART: This product uses the built-in multifunctional serial interface as a serial communication interface (2 channels in the MB91770 series and 4 channels in the MB91725 series ). The multifunctional serial interface can be switched by software to select UART, clock synchronous serial, LIN-UART and I2C for each channel. This can flexibly support the communication specifications of external devices and improve the freedom of system design. In addition to the multi-function serial interface, this product also has 6 channels of LIN-UART, which can communicate with more control units.
Functions that can expand the layout of the circuit board
1. Special power supply for external bus interface terminal: This product is equipped with an independent power supply for external bus interface terminal. Therefore, there is no need to install a level shifter on the ECU board (previously connecting those external devices with different operating voltages in a traditional product that uses a single power supply must have a level shifter). In addition, the power supply voltage range of the external bus interface terminal is 3.0V to 5.5V, so it can be flexibly connected to the unit memory, ASIC for graphics, etc.
2. I / O redistribution function: the allocation and wiring of the peripheral unit of the microcontroller depends largely on the pin assignment of the microcontroller. In order to reduce the physical constraints caused by the pin assignment to the circuit board layout, this product provides a built-in I / O redistribution function, which can be changed by software settings. Since the I / O redistribution function allows us to select the peripheral terminals to be used from the allocated terminals, the degree of freedom of circuit board layout can be greatly improved.
The number of slaves and branches (number of terminals that can be reassigned) are as follows:
Number of peripherals and branches
PPG: 11 channels × 3 branches
Input acquisition: 6 channels × 3 branches
LIN-UART: 4 channels × 2 branches
Reload timer: 4 channels × 3 branches
Figure 2 shows the outline of the I / O redistribution function.
Figure 1: Application view of MB91770 series / MB91725 series in automobiles.
Figure 2: Schematic diagram of I / O redistribution function.
Applications
1.MB91770 series (for instrument panel application)
Although there are many different types of dashboard indications in recent cars, those dashboard systems that process visual information need to deliver the necessary driving information to the driver without error in a short period of time. The MB91770 series realizes the real-time processing of the system and has the high processing performance of the FR81S core; it has built-in peripheral functions and is the best choice for instrument panel control using the STN method and LCD panel.
It has 6 channels of built-in stepping motor controller and can control the pointers of speedometer, tachometer and so on. It also has a segmented LCD controller (32 segments x 4com) for odometer indication and a sound generator for generating a waveform that serves as the sound source of the steering signal. Compared with traditional products, the function of the sound generator has been greatly improved. Although the traditional sound generator only has a fade-out effect function that can gradually reduce the volume when the volume changes, the MB91770 series can reduce or increase the volume at a prescribed speed in addition to the fade-out effect. And, you can use 16-bit resolution to fine-tune the volume, thereby achieving a smoother sound change.
The application example of MB91770 series is shown in Figure 3.
Figure 3: Application example of MB91770 series
2.MB91725 series (for car body control applications)
Control the air conditioning and BCM system in the car through various switch inputs in the car and the information from the built-in car sensors. Regardless of the outside weather conditions and driving conditions, it is necessary to have air conditioning to maintain comfortable interior conditions. When the car is parked in the hot sunlight, the temperature inside the car is quickly reduced to a more comfortable level by performing optimal control, and a comfortable temperature in the car is maintained based on information from various sensors. The BCM system can realize centralized control on multiple body system ECUs (such as doors, seats and combination switches). Manufacturers are also considering integrating ECU functions for keyless entry.
The MB91725 series has a large number of built-in serial interfaces, so it can be connected to multiple ECUs using a CAN / LIN network. It also has multiple channels with timer functions and A / D converters, thus enabling the integration of various functions.
In addition to the main Flash memory for programs, the MB91725 series also has built-in Flash memory for data. This allows writing / erasing operations in the data-oriented Flash memory during the execution of the program from the program-oriented main Flash memory; this can replace E2PROM. This helps reduce the number of components on the ECU circuit board.
The advantages of data flash: E2PROM is no longer needed, and the circuit board area can be reduced; the speed of data writing is improved; data, programs, etc. are stored in the flash memory of the microcontroller, which helps prevent information leakage.
Figure 4 shows the application example of MB91725 series.
Product Technical Index
Table 1 shows the main technical indicators of this product.
Table 1
Development environment
This product adopts on-chip debugging method. In traditional products, it is necessary to use the ICE main unit and verification evaluation chip to achieve debugging, and then use the device on the car to achieve system evaluation. This product allows the use of actual devices for unit system evaluation and automotive evaluation. In addition, it uses a single-wire debugging interface, which can achieve automotive evaluation or conformance testing, and can use a universal coaxial cable to achieve communication between a small ICE main unit and a target circuit board within a range of up to 10 meters. This can simplify car evaluation that is conventionally difficult to achieve.
Figure 5
Figure 5 shows the development environment view, and Table 2 shows the development environment configuration.
Future development
After developing products for instrument panel control and body control applications, we will continue to develop microcontroller series products with built-in FR81S CPU core, including products for motor control applications.
Table 2
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