TLE7469GV53 Просмотр технического описания (PDF) - Infineon Technologies

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TLE7469GV53

Dual Low Drop Voltage Regulator

Infineon Technologies 

TLE 7469

the closed window is interpreted as a pretrigger failure and results in a reset. After the

closed window the open window with the duration tOW is started again. The open window

lasts at minimum until the trigger process has occurred, at maximum tOW is 32 ms (typ.

value with fast timing).

A HIGH to LOW transition of the watchdog trigger signal on pin WDI is taken as a trigger.

To avoid wrong triggering due to parasitic glitches two HIGH samples followed by two

LOW samples (sample period tsam typ. 0.25 ms) are decoded as a valid trigger (see

Figure 7). A reset is generated (RO goes LOW) if there is no trigger pulse during the

open window or if a pretrigger occurs during the closed window. The triggering is correct

also, if the first three samples (two HIGH one LOW) of the trigger pulse at pin WDI are

inside the closed window and only the fourth sample (the second LOW sample) is taken

in the open window.

Reset

Alw ays

Ignore

W indow

Trigger During

Closed W indow

No Trigger During

O pen W indow

A lw a y s

C lo s e d

W indow

Trigger

No Trigger

Figure 6 Window Watchdog State Diagram

Open

W indow

AEA03533.VSD

Final Data Sheet

17

Rev. 1.3, 2004-10-28

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