TLE8262E datasheet(57/93 Pages) INFINEON

57 / 93 page

Data Sheet

Rev. 1.0, 2009-03-31

TLE8262E

Supervision Functions

Figure 23

Window Watchdog Definitions

Figure 24

Window Watchdog Timing Diagram for config 1 and config 3

11.2.3

Changing the Watchdog Settings

The settings of the watchdog can be changed during the operation of the watchdog. The change is done with a

SPI programming into the Watchdog Configuration Register. The new setting is programmed together with a valid

watchdog trigger according to the old settings. The timer with the new settings starts with this SPI command. The

toggling of the “WD Refresh” bit needs to be continued (transition HIGH to LOW or LOW to HIGH) with the new

settings.

If the new settings were not valid, the watchdog will continue with the old settings and generate a “Wrong WD Set”

interrupt.

closed window

open window

tCWmin

t / [tWDPER]

tWD

tOWmax

safe trigger area

tCWmax

tOWmin

0.45

1.1

0.9

0.55

Un-

certainty

uncertainty

Wd1_per .vsd

1.0

Window Watchdog Timing (SPI)

WDR

Watchdog

timer reset

normal

operation

Time-out

(too long)

timeout

(too short)

normal

operation

Refresh

bit

normal

operation

CW+tOW

Wd2_per.vsd

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