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I
(taper)
V
(taper)
K
(设置)
R
设置
(3)
I
(期)
V
(期)
K
(设置)
R
设置
(4)
SleepModeforCharger
OperationModes
StatusOutputs
pgoutput(powergood)
bq25010
bq25011
bq25012
SLUS615–DECEMBER2004
functionaldescriptions(持续)
thebqhybridresetsthetapertimerintheeventthatthechargecurrentreturnsabovethetaperthreshold,
I
(taper)
.
inadditiontothetapercurrentdetection,thebqhybridterminateschargeintheeventthatthechargecurrent
fallsbelowtheI
(期)
门槛.thisfeatureallowsforquickrecognitionofabatteryremovalconditionor
insertionofafullychargedbattery.notethattapertimerisnotactivated.theresistorconnectedbetweenthe
iset1andvsspins,r
设置
,determinesthetaperdetectionlevel.thev
(期)
andK
(设置)
parametersarespecified
inthespecificationstable.notethatthisappliestobothacandusbcharging.
afterchargetermination,thebqhybridrestartsthechargeoncethevoltageonthebat/outpinfallsbelowthe
V
(rch)
门槛.thisfeaturekeepsthebatteryatfullcapacityatalltimes.
thebqhybridentersthelow-powersleepmodeifbothacandusbareremovedfromthecircuit.thisfeature
preventsdrainingthebatteryduringtheabsenceofV
CC
.
operationalmodesofthebqhybridaresummarizedintable1.operationofdc-dcisnotrecommendedwhile
chargerisinprechargemode.
table1.operationmodes
batteryvoltageacorusbadapterstatuschargerstatusdc-dcstatus
V
i(bat)
>v
(lowv)
PresentFastEN
0v<v
i(bat)
<v
(lowv)
PresentPrechargeEN
V
i(bat)
<v
(uvlo)
BothabsentOffOff
thestat1andstat2open-drainoutputsindicatevariouschargerandbatteryconditionsasshownintable2.
thesestatuspinscanbeusedtocommunicatetothehostprocessor.notethatoffindicatestheopen-流
transistoristurnedoff.
table2.statuspinssummary
CHARGESTATEINPUTPOWERSTATESTAT1STAT2
PrechargeinprogressPresentONON
FastchargeinprogressPresentONOFF
ChargedoneNotreportedOFFON
TimerfaultNotreportedOFFOFF
SpeelmodeAbsentOFFOFF
theopen-drainpgoutputindicateswhentheacadapterispresent.theoutputturnsonwhenavalidvoltage
isdetected.thisoutputisturnedoffinthesleepmode.thepgpincanbeusedtodriveanledorcommunicate
tothehostprocessor.
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