參數(shù)資料
型號(hào)： bq2011
廠商： Benchmark Technology Group
英文描述： Gas Gauge IC for High Discharge Rates(用于高放電率的氣體Gauge芯片)
中文描述： 氣體計(jì)IC，高放電率（用于高放電率的氣體計(jì)芯片）
文件頁(yè)數(shù)： 8/20頁(yè)
文件大?。?/td> 181K
代理商： BQ2011
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°Ctemperaturestepbelow10°C.
Comp. factor = 1.00 + (0.05*N)
Where N = number of 10°C steps below 10°C and
V
SR
< 50mV.
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
180
*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 temperature step
(10°C). See Table 2
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 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 3 illustrates the current-sensing error as a func-
tion of V
SR
. A digital filter eliminates charge and
discharge counts to the NAC register when V
SRO
(V
SR
+
V
OS
) is between -400
μ
V and 500
μ
V.
8
bq2011
Temperature
Range
Self-Discharge Compensation
Typical Rate/Day
< 10°C
NAC320
10–20°C
NAC160
20–30°C
NAC80
30–40°C
NAC40
40–50°C
NAC20
50–60°C
NAC10
60–70°C
NAC5
> 70°C
NAC2 5
Table 2. Self-Discharge Compensation
Approximate
V
SR
Threshold
V
SR
< 50 mV
V
SR1
> 50 mV
V
SR2
> 100 mV
V
SR3
> 150 mV
V
SR4
> 253 mV
Discharge
Compensation
Factor
1.00
1.05
1.15
1.25
1.25
Efficiency
100%
95%
85%
75%
75%
Symbol
Parameter
Typical
Maximum
Units
Notes
INL
Integrated non-linearity
error
Integrated non-
repeatability error
±
2
±
4
%
Add 0.1% per °C above or below 25°C
and 1% per volt above or below 4.25V.
Measurement repeatability given
similar operating conditions.
INR
±
1
±
2
%
Table 3. bq2011 Current-Sensing Errors
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