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參數(shù)資料
| 型號(hào)： | bq2052 |
| 廠(chǎng)商： | Benchmark Technology Group |
| 英文描述： | Gas Gauge IC for Lithium Primary Cells(Gas Gauge 芯片（用于鋰電池）) |
| 中文描述： | 氣體計(jì)IC（電量監(jiān)測(cè)計(jì)芯片（用于鋰電池），鋰原電池） |
| 文件頁(yè)數(shù)： | 5/18頁(yè) |
| 文件大?。?/td> | 161K |
| 代理商： | BQ2052 |
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Main Gas-Gauge Registers
Programmed Full Count
The PFC register stores the user-specified battery full
capacity. The 8-bit PFC registers stores the full capacity
in mVh scaled as shown in Table 2.
Full Nominal Available Capacity
The FNAC register stores the full capacity reference of
the battery. It can be programmed to initialize to PFC
or zero. The 8-bit FNAC register stores data scaled to
the same units as PFC. The bq2052 does not update
FNAC during the course of operation; therefore, if it is
programmed to 0 on initialization, it must be written to
full using the serial port.
Discharge Count Regist
er
The DCR is the main gas gauging register and contains
the cumulative amount of discharge counted by the
bq2052.
The 16-bit register stores data scaled to the
same units as PFC.
Compensated Available Capacity
The CAC registers contain the current available capac-
ity of the battery.
The data stored in CAC represents
the amount of remaining capacity of the battery compen-
sated for rate and temperature use conditions. Tables 3,
4, and, 5 outline the options for typical efficiency com-
pensation factors for lithium primary batteries. The
bq2052 applies the efficiency factors to FNAC to derive
CAC.
The bq2052 applies the compensation according to the
formula:
CAC = [F
CE
FNAC] - DCR
Where F
CE
is the calculated efficiency compensation
factor, FNAC = Full Nominal Available Capacity and
DCR = Discharge Count Register.
The bq2052 calculates an F
CE
based on the battery dis-
charge rate and temperature. The discharge rate por-
tion of the F
CE
compensation is a “peak hold” function;
therefore, the bq2052 latches the highest discharge rate
it has measured and uses the highest rate to calculate
F
CE
throughout the complete discharge cycle.
highest discharge rate measured by the bq2052 is stored
in MRATE (address = 12h).
The
The bq2052 does not latch the temperature portion of an
F
CE
calculation.
Therefore, CAC may increase or de-
crease during the course of a complete discharge cycle if
a temperature shift causes a change in the calculated
F
CE
value.
Programming the bq2052
The bq2052 is programmed with the PROG
1–6
pins.
During power-up or initialization, the bq2052 reads the
state of these six three-level inputs and latches in the
programmable configuration settings.
5
Preliminary
bq2052
7
PROG
x
Programmed
Full Count
(PFC)
PROG
3
Units
1
2
H
Z
L
-
-
-
SCALE =
1/40
1203
1152
1082
998
960
902
794
723
653
SCALE =
1/80
602
576
541
499
480
451
397
362
327
SCALE =
1/160
301
288
271
250
240
226
199
181
164
mVh/
count
mVh
mVh
mVh
mVh
mVh
mVh
mVh
mVh
mVh
H
H
H
Z
Z
Z
L
L
L
H
Z
L
H
Z
L
H
Z
L
48128
46080
43264
39936
38400
36096
31744
28928
26112
Table 2. bq2052 Programmed Full Count mVh
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