DEVELOPMENT BACKGROUND

Currently, the electronic and electrical architecture of automobiles is becoming increasingly complex, and the safety requirements for automotive electronics are also rising. To meet the safety requirements of automobiles, functional safety is gaining more attention. When it comes to functional safety, the first thing that comes to mind is the functional safety standard ISO 26262. In particular, ISO 26262-5(2018) Clause 8 introduces two metrics: Single-point fault metric (single-point fault metric) and Latent-fault metric (latent fault metric). Depending on the required ASIL level, the single-point fault metric and latent fault metric must meet the corresponding levels.

For microcontrollers (MCU, referred to as MCU below), within the electronic and electrical system, they are designed and developed as SEooC (safety element out of context). To meet the aforementioned metric requirements, MCUs need to implement corresponding safety mechanisms. These safety mechanisms can be allocated to both hardware and software modules. The Safety Frame safety library for MCUs is the implementation of safety mechanisms allocated to software.

Product Feature

Ø  Can be integrated as a complex driver into AUTOSAR 

Ø  Meet the different safety level requirements of the controller.

Ø  Can be integrated into non-AUTOSAR software architecture.

Ø  High scalability: Each module is configurable to meet different customer requirements.

Ø  Internal Program Flow Monitoring of the Safety Library.

Configuration Tool

To meet the diverse project requirements of customers and enhance the scalability of the Safety Library, the MPC5746C Safety Library has implemented the configurability of each module and has developed a configuration tool for the Safety Library. Customers can complete the configuration of various modules of the Safety Library using the configuration tool according to different needs. They can generate configuration code files, and integrate the generated configuration files into the project.

Run Phase

Ø  PreRun Phase

This phase involves testing the safety mechanisms of the MCU, which is generally conducted before the OS starts up.

Ø  Run Phase

This phase takes place during task execution, while the OS is running, and some of the MCU's safety mechanisms are tested during this phase.

Process Documentation

The MPC5746C Safety Library is designed to assist customers in achieving functional safety requirements based on the MPC5746C platform. The Safety Library is highly scalable and can be configured and redeveloped according to different customer project requirements, ultimately meeting the customers' functional safety requirements.

      The MPC5746C Safety Library is used to implement the software safety mechanisms of the MPC5746C, including the testing of internal MCU modules and the driving of hardware safety mechanisms. 

The MPC5746C Safety Library can be applied to controllers that require functional safety levels.

For example:

Ø  Door Control Module

Ø  Seat Module

Ø  Body Controller

Ø  High-End Gateway Controller

By integrating the Safety Library into the control based on MPC5744C, it is possible to meet the ISO 26262 ASIL-D level requirements.

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