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參數(shù)資料
| 型號： | bq2012 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Gas Gauge IC With Slow-Charge Control(Gas Gauge芯片（帶慢充電控制）) |
| 中文描述： | 氣體計IC緩慢充電控制（電量監(jiān)測計芯片（帶慢充電控制）） |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 188K |
| 代理商： | BQ2012 |
Self-Discharge Estimation
The bq2012 continuously decrements NAC and increments
DCR for self-discharge based on time and temperature.
The self-discharge count rate is programmed to be a nomi-
nal
164
*NAC or
147
*NAC per day or disabled as selected
by PROG
5
. This is the rate for a battery whose tempera-
ture is between 20°–30°C. The NAC register cannot be
decremented below 0.
Count Compensations
The bq2012 determines fast charge when the NAC up-
dates at a rate of
≥
2 counts/sec. Charge and discharge are
compensated for temperature and charge/discharge
rate before updating the NAC and/or DCR. Self-dis-
charge estimation is compensated for temperature be-
fore updating the NAC or DCR.
Charge Compensation
Two charge efficiency compensation factors are used for
trickle charge and fast charge. Fast charge is defined as
a rate of charge resulting in
≥
2 NAC counts/sec (
≥
0.15C
to 0.32C depending on PFC selections; see Table 2). The
compensation defaults to the fast charge factor until the
actual charge rate is determined.
Temperature adapts the charge rate compensation factors
over three ranges between nominal, warm, and hot tem-
peratures. The compensation factors are shown below.
Discharge Compensation
Corrections for the rate of discharge are made by adjusting
an internal discharge compensation factor. The discharge
factor is based on the dynamically measured V
SR
.
compensation factors during discharge are:
The
Temperature compensation during discharge also takes place.
At lower temperatures, the compensation factor increases by
0.05foreach10°Ctemperaturerangebelow10°C.
Compensation 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
nominal rate of
164
*NAC or
147
*NAC per day. 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 tem-
perature step (10°C). See Table 3.
Digital Magnitude Filter
The bq2012 has a programmable digital filter to eliminate
charge and discharge counting below a set threshold. The de-
fault 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. Table4showstypicaldigitalfiltersettings.
V
SRD
(mV) = -45 / DMF
V
SRQ
(mV) = -1.25*V
SRD
8
bq2012
Temperature
Step
Typical Rate
PROG
5
= Z
PROG
5
= L
< 10°C
NAC256
NAC188
10–20°C
NAC128
NAC94
20–30°C
NAC64
NAC47
30–40°C
NAC32
NAC23 5
40–50°C
NAC16
NAC11 8
50–60°C
NAC8
NAC5 88
.
Table 3. Self-Discharge Compensation
Charge
Temperature
<30°C
30–40°C
> 40°C
Trickle Charge
Compensation
0.80
0.75
0.65
Fast Charge
Compensation
0.95
0.90
0.80
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
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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