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bq27441 Data Memory Parameter Descriptions
6.4.2.3.7 Terminate Voltage
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
State
82
16
I2
Terminate Voltage
2500
3700
3200
mV
Terminate Voltage
is used in the Impedance Track™ algorithm to compute
RemainingCapacity()
. This is
the absolute minimum voltage for end of discharge, where the remaining chemical capacity is assumed to
be zero.
This register is application dependent. It should be set based on the battery cell specification to prevent
damage to the cells or the absolute minimum system input voltage, taking into account the impedance
drop from the PCB traces, FETs, and wires.
Terminate Voltage
should typically be set to the lowest possible value at which the system will operate, in
order to maximize run-time and capacity extracted from the battery. The gauge will automatically learn the
load spikes characteristic of the system during operation and store it in
Delta Voltage
, thereby adding
margin to capacity predictions when necessary. The effect is that StateOfCharge() will reach 0% at
Terminate Voltage
+
Delta Voltage
and
RemainingCapacity()
will represent the amount of charge
available from the present depth of discharge until that voltage is reached.
6.4.2.3.8 Thermal Rise Factor (T Rise)
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
State
82
22
I2
T Rise
0
32767
20
Num
The
T Rise
constant reflects the level of system heating due to self-heating of the cell during discharge.
This number can be measured empirically.
6.4.2.3.9 Thermal Time Constant (T Time Constant)
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
State
82
24
I2
T Time Constant
0
32767
1000
s
T Time Constant
reflects the time constant of system heating due to self-heating of the cell during
discharge. This number can be measured empirically.
6.4.2.3.10 SOC Interrupt Delta
Subclass
Subclass
Offset
Type
Name
Value
Unit
ID
Min
Max
Default
State
82
26
U1
SOCI Delta
0
100
1
%
The
SOCI Delta
parameter is active when the SOC_INT function is activated when
OpConfig
[BATLOWEN]
is cleared. In this case, the GPOUT pin generates interrupts with ~1-ms pulse width under
various conditions as described in
45
SLUUAC9A – December 2013 – Revised May 2015
Data Memory
Copyright © 2013–2015, Texas Instruments Incorporated