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bq27441 Data Memory Parameter Descriptions
6.4.2.3.11 Taper Rate, Taper Voltage
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
State
82
27
I2
Taper Rate
0
2000
100
0.1 Hr
rate
29
I2
Taper Voltage
0
5000
-G1A = 4100
mV
-G1B = 4200
Taper Rate
is used in the Primary Charge Termination Algorithm.
AverageCurrent()
is integrated over
each of the two 40-second periods separately and averaged separately to determine two averages
(IRateAvg1, IRateAvg2).
The
Taper Voltage
threshold defines the minimum voltage necessary as a qualifier for detection of charge
termination.
Three requirements must be met to qualify for Primary Charge Termination:
•
During two consecutive periods of 40 seconds:
IRateAvg1 <
Taper Rate
and IRateAvg2 <
Taper Rate
•
During the same periods: Accumulated change in capacity per 40-second period
•
Voltage()
>
Taper Voltage
When the Primary Charge Termination conditions are met, the
Flags() [FC]
bit is set and
[CHG]
bit is
cleared. Also, if the
OpConfig [RMFCC]
bit is set, then
RemainingCapacity()
is set equal to
FullChargeCapacity()
.
6.4.2.3.12 Sleep Current
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
State
82
31
I2
Sleep Current
0
1000
10
mA
When
AverageCurrent()
is less than
Sleep Current
or greater than (–)
Sleep Current
, the gauge enters
SLEEP mode if the feature is enabled by setting the
OpConfig [SLEEP]
bit.
This setting should be below any normal application currents.
6.4.2.3.13 Voltage at Charge Termination
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
State
82
33
I2
V at Chg Term
0
5000
-G1A = 4190
mV
-G1B = 4290
V at Chg Term
should be initialized to the typical charging voltage of the system. Typically, if using the
default battery profile (CHEM_ID = 0x1202), the charging voltage will be 4200 mV and the default value of
V at Chg Term
can be used. If using ALT_CHEM1 (CHEM_ID = 0x1210) then
V at Chg Term
could be
initialized to 4300 mV. If using ALT_CHEM2 (CHEM_ID = 0x354),
V at Chg Term
could be initialized to
4350 mV.
V at Chg Term
will automatically be updated and learned by the gauge during system operation whenever
charge termination is detected. It represents the full charge point for a given system which can vary from
charger to charger and also depends on temperature and other factors.
6.4.2.3.14 Average Current Last Run
46
Data Memory
SLUUAC9A – December 2013 – Revised May 2015
Copyright © 2013–2015, Texas Instruments Incorporated