Datasheet

TLE 6368 / SONIC
Data Sheet 15 Rev. 2.2, 2006-12-01
Figure 7 Window watchdog timing
Figure 7 gives some timing information about the window watchdog. Looking at the
upper signals the perfect triggering of the watchdog is shown. When the 5V linear
regulator Q_LDO1 reaches its reset threshold, the reset delay time has to run off before
V
Rth1
t
RES
R1
t
t
V
Q_LDO1
1V
t
Watchdog
window
t
CS
t
ERR
Perfect triggering after Power on Reset
Incorrect triggering
t
Watchdog
window
CW OW
t
CS
3) 4)
1) Watchdog enable command with no trigger: D0D9D14D15=0100
2) Watchdog trigger: D15=1
3) Pretrigger
4) M issing trigger
Legend: OW = Open window
CW = Closed window
with WD-
trig=1
t
SR
CW OW CW OW CW CW OW
t
CW
2)2)2)1)