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參數(shù)資料
| 型號： | bq2010 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Gas Gauge IC(Gas Gauge芯片) |
| 中文描述： | 氣體計IC（電量監(jiān)測計芯片） |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 185K |
| 代理商： | BQ2010 |
The compensation factors during discharge are:
Temperature compensation during discharge also takes
place. At lower temperatures, the compensation factor in-
creasesby0.05foreach10°Ctemperaturestepbelow10°C.
Comp. factor = 1.0 + (0.05*N)
Where N = Number of 10°C steps below 10°C and
-150mV < V
SR
< 0.
For example:
T > 10°C :Nominal compensation,N = 0
0°C < T < 10°C:N = 1 (i.e.,1.0 becomes 1.05)
-10°C < T < 0°C:N = 2 (i.e.,1.0 becomes 1.10)
-20°C < T < -10°C:N = 3 (i.e.,1.0 becomes 1.15)
-20°C < T < -30°C:N = 4 (i.e.,1.0 becomes 1.20)
Self-Discharge Compensation
The self-discharge compensation is programmed for a nomi-
nal rate of
164
*NAC,
147
*NAC per day, or disabled. This is
the rate for a battery within the 20–30°C temperature
range (TMPGG = 6x). This rate varies across 8 ranges from
<10°C to >70°C, doubling with each higher temperature
step(10°C). SeeTable3.
Digital Magnitude Filter
The bq2010 has a programmable digital filter to elimi-
nate charge and discharge counting below a set thresh-
old.
The default setting is -0.30mV for V
and
+0.38mV for V
. The proper digital filter setting can
be calculated using the following equation.
shows typical digital filter settings.
Table 4
V
SRD
(mV) = -45 / DMF
V
SRQ
(mV) = -1.25*V
SRD
Table 4. Typical Digital Filter Settings
Error Summary
Capacity Inaccurate
The LMD is susceptible to error on initialization or if no
updates occur.
On initialization, the LMD value in-
cludes the error between the programmed full capacity
and the actual capacity.
This error is present until a
valid discharge occurs and LMD is updated (see the
DCR description on page 7). The other cause of LMD er-
ror is battery wear-out. As the battery ages, the meas-
ured capacity must be adjusted to account for changes in
actual battery capacity.
A Capacity Inaccurate counter (CPI) is maintained and
incremented each time a valid charge occurs (qualified
by NAC; see the CPI register description) and is reset
whenever LMD is updated from the DCR. The counter
does not wrap around but stops counting at 255. The ca-
pacity inaccurate flag (CI) is set if LMD has not been
updated following 64 valid charges.
Current-Sensing Error
Table 5 illustrates the current-sensing error as a func-
tion of V
. A digital filter eliminates charge and dis-
charge counts to the NAC register when V
SRO
(V
SR
+
V
OS
) is between V
SRQ
and V
SRD
.
Communicating With the bq2010
The bq2010 includes a simple single-pin (DQ plus re-
turn) serial data interface. A host processor uses the in-
terface to access various bq2010 registers. Battery char-
acteristics may be easily monitored by adding a single
contact to the battery pack. The open-drain DQ pin on
8
bq2010
Temperature
Range
Typical Rate
PROG
5
= Z
PROG
5
= L
< 10°C
10–20°C
20–30°C
30–40°C
40–50°C
50–60°C
60–70°C
> 70°C
NAC256
NAC188
NAC128
NAC94
NAC64
NAC47
NAC32
NAC23.5
NAC16
NAC11.8
NAC8
NAC5.88
NAC4
NAC2.94
NAC2
NAC1.47
Table 3. Self-Discharge Compensation
Approximate
V
SR
Threshold
V
SR
> -150 mV
V
SR
< -150 mV
Discharge
Compensation
Factor
1.00
1.05
Efficiency
100%
95%
DMF
75
100
DMF
Hex.
4B
64
96
AF
C8
V
(mV)
-0.60
-0.45
-0.30
-0.26
-0.23
V
(mV)
0.75
0.56
0.38
0.32
0.28
150 (default)
175
200
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相關(guān)代理商/技術(shù)參數(shù) |
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| BQ2010PN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Battery Management |
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| BQ2010SN- | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Gas Gauge IC |
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