In recent years, the importance of advanced driver-assistance systems (ADAS) that support a high level of Automotive Safety Integrity Level (ASIL) has increased as automobile accident prevention measures and autonomous driving progress. Automated driving requires a vehicle's on-board control system to replace the human driver in performing the four elements of human driving: “Cognition” with the ears and eyes, “Prediction” and “Judgment” with the brain, and “Operation” via the steering wheel and accelerator.
For safe automated driving, accurate sensing, timely control and fast display imaging are necessary. For the unit to achieve safety requirements, it is also necessary to monitor the internal operating conditions and take care of any lack of functionality because of unit failure. In order to achieve this, the number of installed cameras and sensors to monitor any external situation are increasing and multi-functionality to inform and display these situations are required in the infotainment system. With the addition of electronic circuits to monitor the operating conditions in each unit, the electronic circuits are becoming more complex and a greater amount of time is being devoted to the design of units and systems.
The market requirements for Reference Design
With increasing the number of on-board units and the number of required functions, the electronic circuits of ADAS/Infotainment peripheral units require more complex designs.
- An optimal combination of cost, size and characteristics are necessary as the number of cameras, sensor units and mounted electronic components increase which result in more complex power supply rails.
- A highly efficient power supply system is necessary since traveling distance cannot be sacrificed.
- It is difficult to see the problems in a single product consideration since there are different noise standards (e.g., CISPR25 Class 5) that have to complied with for automotive units and many design elements other than functional design that have to be catered for.
- In order to improve the safety function as a unit or system, it is necessary to have a function to monitor the power rail, detect the failure of the electronic circuit, and transmit it to the CPU.
To adapt these market requirements, ROHM has developed a reference design that satisfies the design elements required for unit design, and has disclosed the available design data on website.
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