4 =
Design Capacity
/5
Design Energy
/5
5 =
AtRate()
(mA)
AtRate()
(10 mW)
6 =
User Rate-mA
User Rate-mW
7 =
Max Avg I
(default)
Max Avg P
Pulsed Load
Compensation
and Termination
Voltage
To take into account pulsed loads while calculating remaining capacity until
Term Voltage
threshold is reached, the BQ28Z610-R2 monitors not only average load but also short load
spikes. The maximum voltage deviation during a load spike is continuously updated during
discharge and stored in
Delta Voltage
, with the minimum value allowed set in
Min Delta
Voltage
.
Reserve Battery
Capacity
The BQ28Z610-R2 allows an amount of capacity to be reserved in both mAh
(
Reserve Cap-mAh
) and cWh (
Reserve Cap-cWh
) units between the point where the
RemainingCapacity()
function reports zero capacity and the absolute minimum pack voltage,
Term Voltage
. This enables a system to report zero capacity/energy, but still have enough
reserve capacity/energy to perform a controlled shutdown or provide an extended sleep
period for the host system.
Pack Based
AND Cell Based
Termination
Voltage
The BQ28Z610-R2 device forces
RemainingCapacity()
to 0 mAh when the battery stack
voltage reaches
Term Voltage
. If
Impedance Track GaugingConfiguration[CELL_TERM]
= 1, the cell-based termination is used, and the
Term Min Cell V
threshold is checked for a
termination condition. The cell-based termination provides an option to enable the gauge to
reach 0 mAh before the device triggers CUV, especially for an imbalanced pack.
6.3 Gas Gauge Modes
Resistance updates take place only in DISCHARGE mode, while OCV and QMax updates only take place in
RELAX mode. Entry and exit of each mode is controlled by data flash parameters in the subclass
Gas Gauging:
Current Thresholds
section. When the device is determined to be in RELAX mode and OCV is taken, the
GaugingStatus[REST]
flag is set. In RELAX mode or DISCHARGE mode, the DSG flag in
BatteryStatus
is set.
Gauging
36
BQ28Z610-R2
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