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TPS65381-Q1 Material explaining usage of Q&A WD (203)

Hello,

 

Please give me Material that explains example usage or how to use Q&A WD.

Datasheet explain function of Q&A WD but it difficult to understand the detail of behavior.

 

Best Regards.

  • The concept behind the QA watchdog it to add coverage of the MCU operation. There are various software and hardware strategies to be used on the MCU with this QA watchdog that depend on the MCU architecture to allow for increased coverage of the MCU operation by requiring various functional blocks of the MCU to be exercised during each QA watchdog cycle. We do not have this material and the MCU vendor may be able to provide methods to feed a QA watchdog to effectively cover more of the MCU functional blocks. By using QA modes the MCU should not simply use look up tables timer interrupts, but rather use software that will exercise as many blocks as the system needs to increase the functional coverage to ensure as much of the MCU is working properly as possible. The QA watchdog can also be used with the MCU Error Signal Monitor (MCU ESM) function with Safety MCUs that have a built in self test / monitoring circuits which feed the error pin to ensure high coverage of MCU funcitonal operation.

    The actual requirements on the TPS65381 are outlined in the watchdog sections starting on page 43 with section 5.4.1.11. The main QA watchdog areas start on page 48 with section 5.4.1.14.3.

    Figure 6-5 on page 94 also outlines an example software flow to make use of the WD.

    - Scott