Datasheet

Data Sheet 18 Rev. 1.6, 2008-01-22
TLE 7469
Figure 7 Window Watchdog Signal Flow
Figure 8 Window Watchdog Definitions
t
Vi/V
VQ/V
VRO/V
Wnd
WDI/V
T
RD
Ingnore Wnd
V
RT
1. Correct Trigger
No Trigger
in OW
t
rr
t
t
t
t
OWCW
t
rr
CW
(Wrong) Trigger
in CW
t
WD,p
T
RD
Power
Fail
T
RD
OW CW
Normal operation
Don’t care WDI
during IW
OW OW OW
AET02952
Watchdog
trigger signal
Valid
Not valid
= Watchdog decoder sample point
ECW
t
Closed window
WDI
WDI
Open window
EOW
t
Open window Closed window