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參數(shù)資料
| 型號： | bq2014 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Gas Gauge IC with External Charge Control(氣體Gauge（帶外部電荷控制）) |
| 中文描述： | 氣體計IC（氣體壓力表與外部充電控制（帶外部電荷控制）） |
| 文件頁數(shù)： | 8/21頁 |
| 文件大小： | 219K |
| 代理商： | BQ2014 |
Temperature adapts the charge rate compensation fac-
tors over three ranges between nominal, warm, and hot
temperatures.The compensation factors are shown below.
Discharge Compensation
Corrections for the rate of discharge are made by adjust-
ing an internal discharge compensation factor. The dis-
charge factor is based on the dynamically measured V
SR
.
The compensation factors during discharge are:
Temperature compensation during discharge also takes place.
At lower temperatures, the compensation factor increases by
0.05foreach10°Ctemperaturerangebelow10°C.
Comp. factor = 1.00 + (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.,1.00 becomes 1.05)
-10°C < T < 0°C:N = 2 (i.e.,1.00 becomes 1.10)
-20°C < T < -10°C:N = 3 (i.e.,1.00 becomes 1.15)
-20°C < T < -30°C:N = 4 (i.e.,1.00 becomes 1.20)
Self-Discharge Compensation
The self-discharge compensation is programmed for a
nominal rate of
1
64
*NAC per day,
147
NAC per day, or
disabled.
This is the rate for a battery within the
20
°
C–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). See Table 3
Digital Magnitude Filter
The bq2014 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
SRD
and
+0.38mV for V
SRQ
. 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) = -125
V
SRD
Error Summary
Capacity Inaccurate
The LMD is susceptible to error on initialization or if no up-
dates occur. On initialization, the LMD value includes the
error between the programmed full capacity and the actual
capacity. This error is present until a valid discharge oc-
curs and LMD is updated (see the DCR description on page
7). The other cause of LMD error is battery wear-out. As
the battery ages, the measured capacity must be adjusted
toaccountforchangesinactualbatterycapacity.
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
8
bq2014
Approximate
V
SR
Threshold
V
SR
> -150 mV
V
SR
< -150 mV
Discharge
Compensa-
tion Factor
Efficiency
1.00
1.05
100%
95%
Charge
Temperature
Trickle Charge
Compensation
Fast Charge
Compensation
< 40°C
0.80
0.95
> 40°C
0.75
0.90
Temperature
Step
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
DMF
75
100
DMF
Hex.
4B
64
96
AF
C8
V
SRD
(mV)
-0.60
-0.45
-0.30
-0.26
-0.23
V
SRQ
(mV)
0.75
0.56
0.38
0.32
0.28
150 (default)
175
200
Table 4. Typical Digital Filter Settings
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