Datasheet

Data Sheet 19 Rev. 1.0, 2008-04-21
TLE4263-2ES
Application Information
6.2 Watchdog
Figure 5 Timing of the Watchdog Function Reset
Watchdog Timing
The period of the watchdog pulses has to be smaller than the minimum watchdog trigger time which is set by the
external reset delay capacitor
C
D
. Use the following formula for dimensioning C
D
:
(2)
with
•
C
D
: capacitance of the delay capacitor to be chosen
•T
WI,tr,new
: desired watchdog trigger time
•T
WI,tr
: watchdog trigger time specified in this data sheet
V
W
t
V
RO
Timing Diagram_Watchdog.vsd
t
V
RO,l
t
WD, L
t
WI , t r
V
DWL
V
DU
t
V
D
t
WD, L
T
WI , p
No positive
V
W
edge
C
D
T
WI,tr,new
T
WI,tr
------------------------
100 nF×=