8-bit mixed-signal microcontrollers reduce the cost and complexity of automotive electronics design

For body electronics and power management systems, high-performance microcontrollers offer the potential for demanding precision control and intelligence for today's automotive electronics design from a safety and chassis perspective. Mixed-signal microcontrollers are being used in more automotive electronic system designs, reducing the design difficulty of the entire system, reducing the number of components and the size of the printed board.

The 8-bit mixed-signal microcontroller provides a range of methods to make automotive electronic systems simple. By integrating a large number of peripherals and communication protocols, such as CAN and LIN buses, mixed-signal microcontrollers minimize peripheral components. Today's enhanced 8-bit mixed-signal microcontrollers increase processing speed, reduce memory size, and extend precision analog peripherals. In addition, such large-scale integration is done in the smallest possible package, because automotive electronics applications are often very limited, such as door and window lifts, door locks, and engine control sensors.

While reducing the size of the printed board, on-chip integration can reduce component costs. Mixed-signal microcontrollers can reduce the number of peripheral components required, such as voltage reference sources, rectifier components, and signal generators. The reduction in the number of components is also the smaller the size of the entire system, which greatly improves the reliability of the entire system, because the more components, the more fragile the reliability.

The C8051F58x series of mixed-signal MCUs is a good example. This MCU provides a large number of on-chip peripherals, such as high-precision oscillators, high-precision voltage reference, and 5V rectifier modules. The automotive grade calibration feature eliminates the need for calibration sensors on the periphery, and the high-speed core reduces memory requirements. The innovative IO distribution system reduces production and test costs to varying degrees. Offering up to 128KB of flash and 50MPIS processing power in a 25mm2 package, the F58x family combines capacity, performance and small package to provide a small, compact solution for automotive electronics engineers. The F58x automotive-grade microcontrollers provide an internal oscillator with an accuracy of +-0.5% from -40 to 125 degrees. By using an internal ADC and temperature sensor, the designer can further increase the accuracy to +-0.25% if For the same effect, using an external oscillator requires an extra $0.20. This high precision allows high-speed CAN and LIN buses to be operated without the need for an external clock, reducing costs while increasing system reliability.

Another unique feature is that the ADC has a proportional gain setting that scales down the input voltage to enable full-scale output of the digital range over the reference voltage range. The 58X's high-speed serial bus also provides convenience for designers. For example, the built-in high-speed CAN2.0 core provides 32 independent message buffers to make the entire system capable of busy network communication by using the built-in LIN2.1 controller. Automotive electronics engineers can further improve network performance. The built-in 8byte message buffer enables hardware synchronization and checksum generation, saving limited CPU resources and making more complex LIN topologies possible.

Flexible design is very important for automotive electronics engineers. In general, the fixed pins provided by the MCU allow designers to deploy only according to existing resources, while the mixed-signal MCU provides a programmable IO distribution system CORSSBAR. Easily assign the corresponding peripheral IO to the available pins, which greatly simplifies the system design and increases resources. For example, the designer can redistribute the pins with two independent LIN buses while the system is running. Reduced system cost and increased design flexibility. Further in design, a digital isolator isolates the CAN physical layer from the MCUCAN bus, which further increases the anti-jamming capability of the MCU in the automotive system and eliminates the effects of the ground loop on the CAN and LIN networks. This is a good choice in an electrical noise environment. In hybrid and pure electric vehicles, digital isolation is also needed. Isolation is integrated into each high-voltage module to provide a channel between communication and high-voltage control, such as battery module management, start-stop system, EPS system, and so on.



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