Fram for automotive market

In recent years, automobile products are increasingly dependent on electronic products. The former mechanical system is transferred to the electronic control unit (ECU). The new system for automotive product safety and user entertainment is faced with a high degree of complexity and resource requirements.




Overview of automotive electronic subsystem


Automotive electronic subsystem is divided into independent and interconnected subsystems. Each subsystem is responsible for handling a specific task, and its scope and complexity may vary, but they all range from a simple RF control interface to a complex conflict avoidance system. However, these subsystems share some basic structures, such as MCU, can, OBD2 and Ethernet system bus interface, input sensor and output control logic. In addition, multiple subsystems need to store data in a timely and continuous manner, so they need to improve performance and durability design. In this case, cypress fram is the best solution.


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When fram is used, the subsystem can store data continuously at full bus speed without additional memory and overhead to manage the number of erasures. This is because fram is a timely non-volatile memory, does not need extra waiting time to store information, and has a write life of 1014 times, while most EEPROM and flash write times are less than 106.




Even if multiple systems need to have the function of storing data, the system can make full use of the performance of fram. For example, a simple RF ECU needs to store user preset data and current status. User presets don't change often; in fact, they can be treated as ROM after they are set up. In addition, the current state often changes, but it is not important to restore the current state, so adding nonvolatile memory to a simple RF system has no value. Therefore, it shows that in some use cases, the performance of FRAM can be fully utilized by more advanced entertainment and navigation systems.


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