TLE6711 Ver la hoja de datos (PDF) - Infineon Technologies

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TLE6711

Multifunctional Voltage Regulator and Watchdog

Infineon Technologies 

TLE 6711

Circuit Description

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.

TWD = 128*tCYL

tSR = 64*tCYL

tWDR = 64*tCYL

tCW=32*tCYL

tOW=32*tCYL

definition

closed window

open window

definition

worst case

reset start delay time after window

watchdog timeout

reset duration time after window

watchdog time-out

tECW

t EOW = end of open window

fOSC=fOSCmax

t (CW+OW)min = ( tCW+ tOW ) (1 - ∆)

fOSC=fOSCmin

t CWmax= tCW (1+∆ )

t WD

t OWmin

Figure 5 Window Watchdog Definitions 1

Example with:

tCYL=1ms

∆=10% (oscillator deviation)

t(CW+OW)min =(tCW+tOW)*(1-∆)=

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

tCWmax= tCW(1+∆)=32*1,1=35,2ms

Closed window Open window

Watchdog

trigger signal

Open window Closed window

WDI

Valid

WDI

Indifferent

WDI

Not valid

t ECW

= Watchdog decoder sample point

t EOW

AET02952

Figure 6 Window Watchdog Definitions 2

Data Sheet

9

Rev. 3.4, 2007-08-16

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