www.德州仪器.com
packconfiguration(pkcfg)—address0x7c
initialmaxloadcurrent(imlc)—address0x7d
bq27000,bq27200
SLUS556B–SEPTEMBER2004–REVISEDNOVEMBER2004
TAPER[7]shouldbesetto
1
toenabletheautomaticagingofthelmdfullcapacityvalue.ifthisfeatureis
使能,lmdisreducedbydesigncapacity/1024everytimecyclincrementsby2andeverytimethata
cumulativenacself-dischargeestimatereductionof1.56%hasbeenmadewithoutchargingthebatterytofull.如果
taper[7]issetto0,thereisnolmdreductionwithcyclecountorself-释放.
BIT7BIT6BIT5BIT4BIT3BIT2BIT1BIT0
namegpienqv1qv0boff(2)boff(1)boff(0)dcfixtcfix
GPIEN
allowsthepackmanufacturertosetthestateofthegpiopinoninitialpowerup.ifthebitis0,这
gpienbitisclearedonresetandthegpiopinactsasahigh-impedanceoutput.ifthebitis1,这
gpienbitissetonresetandthegpiopinactsasaninput.thestateofthegpiopincanthenbe
readthroughthegpstatbitinthemoderegister.
qv1&放大;qv0
thesebitssettheminimumqualificationvoltageforchargetermination.theterminationvoltage
thresholdsaresetaslistedintable3.
table3.chargeterminationvoltagesettings
qv1qv0voltage(mv)
003968
014016
104064
114112
BOFF
thesebitsareusedtostoreatypicalboardoffsetvalueforthegauge.thisvalueisaddedtothe
internaloffsetmeasurementandthetotalappliedasanoffsetcorrectionforthechargeand
dischargecoulometricmeasurementsmadebythedscc.thisisa2s-complementsignednumber
withavalueof2.45µvperbit.
table4.boardoffsetvoltagesettings
boardoffsetboff(2)boff(1)boff(0)
+7.35µv011
+4.9µv010
+2.45µv001
0000
-2.45µv111
-4.9µv110
-7.35µv101
-9.8µv100
DCFIX
fixeddischargecompensation.normaldischargeratecompensation(dcompregister)isusedif
thisbitissetto0.ifthisbitissetto1,thedeviceassumesafixedvalueof0x42fordcomp,给
adischargeratecompensationgainof6.25%withacompensationthresholdofc/4.settingthebit
至
1
freestheeepromlocationof0x7eforuseasaprogrammableidentificationbyte.
TCFIX
fixedtemperaturecompensation.normaltemperaturecompensation(tcompregister)isusedif
thisbitissetto0.ifthisbitissetto1,thedeviceassumesafixedvalueof0x7cfortcomp,给
atemperaturecompensationgainof0.68%ofdesigncapacity/
°
Cwithanoffsetof12
°
c.设置
thisbitto
1
freestheeepromlocationof0x7fforuseasaprogrammableidentificationbyte.
thisregistercontainsthescaled,终止-设备-designmaximumcurrent.onafullresetorpor,thisvalueis
transferredtothemliregisterandusedtocalculatemaxloadtime-至-empty.thedevicelearnsanewmaximum
loadifthecurrentexceedstheinitialmaximumload.theequationforprogrammingthisvalueis:
imlc=designmaxcurrent(毫安)*r
S
(m
Ω
)/457
µ
V
whereR
S
isthevalueofthesenseresistorusedinthesystem.
20
: 点此下载
