Window

Timing

WDI

WDO

= Tolerance Window

Early Fault

WDO

Late Fault

WDI

Valid

Window

Correct Operation

WDI

WDO

13

TPS3430

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SBVS366 – JULY 2018

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Feature Description (continued)

7.3.3 Window Watchdog Timer

This section provides information for the window watchdog modes of operation. A window watchdog is typically

employed in safety critical applications where a traditional watchdog timer is inadequate. In a traditional

watchdog, there is a maximum time in which a pulse must be issued to prevent the reset from occurring.

adjusting the SET0 and SET1 pins. Figure 12 shows the valid region for a WDI pulse to be issued to prevent the

WDO from being triggered and being pulled low.

Figure 12. TPS3430 Window Watchdog Timing