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參數資料
| 型號： | bq2050 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Lithium Ion Power Gauge IC(鋰離子電源Gause 芯片) |
| 中文描述： | 鋰離子動力計IC（鋰離子電源高斯芯片） |
| 文件頁數： | 5/21頁 |
| 文件大?。?/td> | 235K |
| 代理商： | BQ2050 |
Gas Gauge Operation
The operational overview diagram in Figure 2 illustrates
the operation of the bq2050. The bq2050 accumulates a
measure of charge and discharge currents, as well as an
estimation of self-discharge. Charge and discharge cur-
rents are temperature and rate compensated, whereas
self-discharge is only temperature compensated.
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 (DCR) 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.
bq2050 adapts its capacity determination based on the
actual conditions of discharge.
Therefore, the
The battery's initial capacity is equal to the Pro-
grammed Full Count (PFC) shown in Table 2. Until
LMD is updated, NAC counts up to but not beyond this
threshold during subsequent charges. This approach al-
lows the gas gauge to be charger-independent and com-
patible 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
(DCR) representing a discharge from full to below
EDV1. A qualified discharge is necessary for a capac-
ity transfer from the DCR to the LMD register. The
LMD also serves as the 100% reference threshold
used by the relative display mode.
5
bq2050
FG205002.eps
Rate and
Temperature
Compensation
Temperature
Compensation
Charge
Current
Discharge
Current
Self-Discharge
Timer
Temperature
Translation
Nominal
Available
Charge
(NAC)
Last
Measured
Discharged
(LMD)
Discharge
Count
Register
(DCR)
<
Qualified
Transfer
+
Compensation
Rate and
Temperature
Temperature Step,
Other Data
+
-
-
+
Inputs
Main Counters
and Capacity
Reference (LMD)
Outputs
Serial
Port
Compensated
Available Charge
LED Display, etc.
Figure 2. Operational Overview
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