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          Functional Safety

          Robustness, reliability and safety of end-products is becoming ever more important. In some application segments these requirements are formalized and mandatory, while in others this is implemented to differentiate the product, and take the step from a good product to an excellent product.

          The standards for functional safety depend on the market that is targeted. Many standards support multiple levels of rigorousness, which are applied depending on the likelihood and severity of the hazard. The methods of addressing hazards range from detecting single failures and putting the system into a safe state, to full redundancy where failures should not only be detected but also corrected without any interruption or degradation of service.
          STANDARD MARKETS
          IEC 60730
          Levels: A, B, C
          Equipment for household, such as controls for heating, air conditioning. The equipment may use electricity, gas, oil, solid fuel, solar thermal energy.
          IEC 61508 (SIL)
          Levels: 1, 2, 3, 4
          Active safety systems such as fire suppression systems, switches in a tank containing flammable liquids.
          ISO 26262 (ASIL)
          Levels: A, B, C, D
           Automotive vehicles up to 3500 kg
           

          In addition to describing what must be tested and to what extent, the standards may also mandate development methods. This may include using qualified development tools. For microcontroller-based applications, one of the tools to be qualified is the C-compiler. Microchip and partners of Microchip offers qualified compilers, listed below:

           
          VENDOR/PRODUCT QUALIFICATION
          Microchip XC8 compiler ISO 26262 up to ASIL D
          Microchip XC16 compiler ISO 26262 up to ASIL D
          Microchip XC32 compiler ISO 26262 up to ASIL D
          IAR Embedded Workbench for ARM ISO 26262 up to ASIL D
           
          Microchip offers a number of products that enable system-level compliance to functional safety. This means that they have integrated features, qualified test libraries, safety manuals, and FMEDA reports, depending on the standard and the level of safety they support. All these items make it easier to develop applications that conform to the functional safety standards, and thereby reduce the work and cost of the final product compliance.
           
          MICRCONTROLLERS AVR®/PIC® MCUs PIC24/dsPIC® MCUs SAM/PIC32 MCUs
          Class B library Yes Yes Yes
          SIL [lvl] library
          ASIL [lvl] library
          AutoSAR/MCAL Yes Yes
          Application notes Yes Yes Yes
          Safety manual Available upon request
          Contact your local sales rep
          Available upon request
          Contact your local sales rep
          FMEDA reports Available upon request
          Contact your local sales rep
          Capacitive touch libraries* Available upon request
          Contact your local sales rep
          Yes
          Safety qualified compilers XC8 XC16 XC32
          Code coverage tools
           
          Available from third party providers such as LDRA
             

          *There are turnkey Capacitive Touch controllers available, such as the AT42QT1481

          INTERFACE AND CONNECTIVITY PRODUCTS CAN AND CAN FD DEVICES
          AutoSAR/MCAL Yes
          Safety manual Yes
          FMEDA reports Yes

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