參數(shù)資料
型號(hào): bq2050H
廠(chǎng)商: Benchmark Technology Group
英文描述: Low-Cost Lithium Ion Power Gauge IC(低價(jià)格鋰離子電源氣體Gauge芯片)
中文描述: 低成本鋰離子動(dòng)力計(jì)IC(低價(jià)格鋰離子電源氣體計(jì)芯片)
文件頁(yè)數(shù): 5/24頁(yè)
文件大?。?/td> 213K
代理商: BQ2050H
Gas Gauge Operation
The operational overview diagram in Figure 2 illustrates
the operation of the bq2050H.
lates a measure of charge and discharge currents, as
well as an estimation of self-discharge.
lated charge and discharge currents are adjusted for
temperature and rate to provide the indication of com-
pensated available capacity to the host system or user.
The bq2050H accumu-
The accumu-
The main counter, Nominal Available Capacity (NAC),
represents the available battery capacity at any given
time.
Battery charging increments the NAC register,
while battery discharging and self-discharge decrement
the NAC register and increment the DCR (Discharge
Count Register).
The Discharge Count Register is used to update the Last
Measured Discharge (LMD) register only if a complete
battery discharge from full to empty occurs without any
partial battery charges. Therefore, the bq2050H adapts
its capacity determination based on the actual condi-
tions of discharge.
The battery's initial capacity equals the Programmed
Full Count (PFC) shown in Table 2. Until LMD is up-
dated, NAC counts up to but not beyond this threshold
during subsequent charges. This approach allows the
gas gauge to be charger-independent and compatible
with any type of charge regime.
1.
Last Measured Discharge (LMD) or learned
battery capacity:
LMD is the last measured discharge capacity of the
battery. On initialization (application of V
CC
or bat-
tery replacement), LMD = PFC. During subsequent
discharges, the LMD is updated with the latest
measured capacity in the Discharge Count Register
representing a discharge from full to below EDV1.
A qualified discharge is necessary for a capacity
transfer from the DCR to the LMD register.
LMD also serves as the 100% reference threshold
used by the relative display mode.
The
5
bq2050H
FG2050H2.eps
Temperature
Compensation
Charge
Current
Discharge
Current
Self-Discharge
Timer
Nominal
Available
Charge
(NAC)
Last
Measured
Discharged
(LMD)
Discharge
Count
Register
(DCR)
<
Qualified
Transfer
+
Temperature
Compensation
Temperature Step,
Other Data
+
-
-
+
Inputs
Main Counters
and Capacity
Reference (LMD)
Outputs
Serial
Port
Compensated
Available Charge
LED Display, etc.
Rate and
Temperature
Compensation
Figure 2. Operational Overview
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