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bq27441 Data Memory Parameter Descriptions
6.4.1.6
Power Subclass
6.4.1.6.1 Hibernate Current
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
Power
68
7
I2
Hibernate I
0
8000
3
mA
When |
AverageCurrent()
| <
Hibernate I
, the gauge enters HIBERNATE mode if the
CONTROL_STATUS
[HIBERNATE]
bit is set and the cell is relaxed. This setting should be below any normal application
currents. Gauging will be halted while in HIBERNATE mode.
6.4.1.6.2 Hibernate Voltage
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
Power
68
9
I2
Hibernate V
0
5000
2200
mV
When |Voltage| <
Hibernate V
, the gauge enters HIBERNATE mode. The
CONTROL_STATUS
[HIBERNATE]
bit is ignored if the voltage is below this threshold. This setting should be below any normal
application voltage.
6.4.2 Gas (Fuel) Gauging Class
6.4.2.1
IT Cfg Subclass
6.4.2.1.1 Ra Filter
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
IT Cfg
80
22
U2
Ra Filter
0
1000
800
Num
Ra Filter
is a filter constant used to calculate the filtered Ra value that is stored into Data Memory from
the old Ra value.
Ra = (Ra_old ×
Ra Filter
+ Ra_new × (1000 –
Ra Filter
)) ÷ 1000
6.4.2.1.2 Fast Qmax Start DOD%, Fast Qmax Start Voltage Delta, Fast Qmax Current Threshold
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
IT Cfg
80
35
U1
Fast Qmax Start DOD %
0
100
92
%
37
I2
Fast Qmax Start Volt Delta
0
4200
125
mV
39
U2
Fast Qmax Current
0
1000
4
Hr rate
Threshold
Fast Qmax measurement starts when the following conditions are met,
•
DOD >
Fast Qmax Start DOD%
or
Voltage <
Terminate Voltage
+
Fast Qmax Start Volt Delta
•
Current < C /
Fast Qmax Current Threshold
6.4.2.1.3 Fast Qmax End DOD%, Fast Qmax Minimum Data Points
37
SLUUAC9A – December 2013 – Revised May 2015
Data Memory
Copyright © 2013–2015, Texas Instruments Incorporated