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t
t
t
t
d
t
d
t
d
重置 因为 的
电源-向下
重置 因为 的 wdi
重置 因为 的 一个 电源 漏出 在下 v
IT–
重置 因为 的 电源-向上
t
t(输出)
SENSEn
V
(nom)
V
它
1.1 v
WDI
1
0
重置
1
0
未阐明的
行为
未阐明的
行为
DETAILEDDESCRIPTION
看门狗
tps3306-15
tps3306-18,tps3306-20
tps3306-25,tps3306-33
SLVS290A–APRIL2000–REVISEDMAY2004
TIMINGDIAGRAM
TerminalFunctions
终端
i/odescription
nameno.
GND4IGround
pfi3ipower-failcomparatorinput
pfo6opower-failcomparatoroutput,打开-流
reset5oactive-lowresetoutput,打开-流
SENSE11ISensevoltageinput1
SENSE22ISensevoltageinput2
WDI7IWatchdogtimerinput
V
DD
8ISupplyvoltage
inamicroprocessor-ordsp-basedsystem,itisnotonlyimportanttosupervisethesupplyvoltage,itisalso
importanttoensurecorrectprogramexecution.thetaskofawatchdogistoensurethattheprogramisnot
stalledinanindefiniteloop.themicroprocessor,微控制器,ordsphastotypicallytogglethewatchdog
inputwithin0.8stoavoidatimeoutoccurring.eitheralow-至-highorahigh-至-lowtransitionresetstheinternal
watchdogtimer.iftheinputisunconnectedortiedwithahighimpedancedriver,thewatchdogisdisabledand
willberetriggeredinternally.
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