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BQ2011SN Gas Gauge IC for High Discharge Rates
Prototype PCB
Part No.:   BQ2011SN
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Description:   Gas Gauge IC for High Discharge Rates
File Size :   195 K    
Page : 21 Pages
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Maker   TI [ TEXAS INSTRUMENTS ]http://www.ti.com
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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:
Discharge
Compensation
Factor
1.00
1.05
1.15
1.25
1.25
Table 2. Self-Discharge Compensation
Temperature
Range
< 10°C
Self-Discharge Compensation
Typical Rate/Day
NAC
NAC
320
160
80
40
20
10
5
Approximate
V
SR
Threshold
V
SR
< 50 mV
V
SR1
> 50 mV
V
SR2
> 100 mV
V
SR3
> 150 mV
V
SR4
> 253 mV
10–20°C
Efficiency
100%
95%
85%
75%
75%
20–30°C
30–40°C
40–50°C
50–60°C
60–70°C
> 70°C
NAC
NAC
NAC
NAC
NAC
NAC
Temperature compensation during discharge also takes place.
At lower temperatures, the compensation factor increases by
0.05 for each 10°C temperature step below 10°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)
2 .5
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
to account for changes in actual battery capacity.
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.
Self-Discharge Compensation
The self-discharge compensation is programmed for a
nominal rate of
1 80
* 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
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 -400µV and 500µV.
Table 3. bq2011 Current-Sensing Errors
Symbol
INL
INR
Parameter
Integrated non-linearity
error
Integrated non-
repeatability error
Typical
±
2
±
1
Maximum
±
4
±
2
Units
%
%
Notes
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.
8
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