TPS3430WDRCR datasheet(13/26 Pages) TI1

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tWDL(min)

Window

Timing

WDI

tWDL(typ)

tWDL(max)

tWDU(min)

tWDU(typ)

tWDU(max)

WDO

= Tolerance Window

Early Fault

WDO

Late Fault

WDI

Valid

Window

Correct Operation

WDI

WDO

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.

However, in a window watchdog the pulse must be issued between a maximum lower window time (tWDL(max))

and the minimum upper window time (tWDU(min)) set by the CWD pin and the SET0 and SET1 pins. Table 6

describes how tWDU can be used to calculate the timing of tWDL. The tWDL timing can also be changed by

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

TPS3430WDRCR 데이터시트(PDF) 13 Page - Texas Instruments