www.德州仪器.com
UDG−03042
温度
补偿
Self−Discharge
计时器
释放
电流
承担
电流
last 量过的
释放 (lmd)
名义上的 一个vailable
承担 (nac)
Qualified
转移
learning 计数
寄存器 (lcr)
Temperature, voltage,
一个verage 电流,
其它 数据
补偿
一个vailable 承担
++
_
_
输入
COMPUTATIONS
输出
比率 和
Temperature
补偿
I
2
c 或者 hdq 接口
+_
RegisterInterface
bq27000,bq27200
SLUS556B–SEPTEMBER2004–REVISEDNOVEMBER2004
functionaldescription(持续)
alearningcyclecanbedisqualifiedbyanyofthefollowingconditions:
1.coldtemperature:temperaturelessthanthevalueprogrammedinthetcompregister(tcomp
≠
0).
2.lightload:acapacitylearningcycleisdisqualifiedifaveragecurrentislessthanorequalto2timesthe
initialstandbyloadwhentheedv1thresholdvoltageisreached.
3.fastvoltagedrop:volt
≤
(edv1–256mv)whenedv1isset.
4.excessivecharging:cumulativecharge>255mahduringalearningdischargecycle(alternating
释放/承担/dischargebeforeedv1isset).
5.重置:vdqisclearedonallresets.
6.excessiveself-释放:nacreductionfromself-dischargeestimate(0.195%)performed64times.
7.自-dischargeatterminationoflearningcycle.ifself-dischargeestimatecausesnac
≤
lmd/16,vdqis
cleared.
figure4.operationaloverview
thebqjuniorstoresallcalculatedinformationinram,whichisbackedupbythevoltageontherbiinput.
eepromregistersstorepermanentuserdata.thememorymapforbq27000/bq27200isshownintable1.
11
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