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TPS65381A-Q1: Watchdog Reset behavior during DIAGNOSTIC state

Max Wittekind
Expert 1875 points
Part Number: TPS65381A-Q1

Dear TI Supportteam,

In the documentation of the TPS65381A-Q1it is said, that WD_FAIL_CNT gets reinitialized to 5 upon entering DIAGNOSTIC state.

(Q1) Since the WD_RST_EN bit is not reset in RESET state, could this lead to a transition from DIAGNOSTIC to RESET before the DIAGNOSTIC STATE TIME-OUT, when the WD is not serviced?

Thank you and best regards,
Max

  • 0
    TI__Genius 12735 points

    Hi Max,

    Figure 5-16 in the TPS65381A-Q1 datasheet has a visualization of the different device controller states. This figure shows the priority of the different transitions between states as well as what causes those transitions. According to this diagram, if WD_FAIL_CNT=7+1 & WD_RST_EN=1 then the priority of the device transition to the Reset State is Priority II, while the transition from Diagnostic to Safe or Active because of the DIAGNOSTIC STATE TIME-OUT is only Priority III, which in this case is lower than Priority II. This means that the device will prioritize the transition to Reset because of the Watchdog over any transitions caused by the DIAGNOSTIC STATE TIME-OUT.

    Best regards,

    Layne J