TLE 6711

Circuit Description

Data Sheet

9

Rev. 3.4, 2007-08-16

is HIGH the system enable goes active HIGH with the first valid watchdog trigger pulse at pin WDI. The SEN output

goes LOW immediately if a pretrigger, a missing trigger or a power down reset occurs.

Figure 5

Window Watchdog Definitions 1

Figure 6

Window Watchdog Definitions 2

t

closed window

open window

t

definition

f

reset start delay time after window

watchdog timeout

reset duration time after window

watchdog time-out

t

t

t

T

t

OWmin

f

definition

worst case

t

WD

Example with:

t

∆=10% (oscillator deviation)

t

=(32+32)x0,9= 57,6ms

t

t

t

ECW

t

AET02952

Watchdog

trigger signal

Valid

Not valid

Indifferent

= Watchdog decoder sample point

ECW

t

Closed window

WDI

WDI

WDI

Open window

EOW

t

Open window

Closed window