BQ28Z560-R1 Datasheet, PDF (33/60 Pages) Texas Instruments – Single Cell Li-Ion Battery Gas Gauge and Protection

bq28z560-R1
www.ti.com
SLUSBD3 – APRIL 2013
LoadSelect Value
0
1(default)
2
3
4
5
6
Table 11. CONSTANT CURRENT Mode Used when LOAD Mode = 0
Current Mode Used
Average discharge current from previous cycle. There is an internal register that records the average discharge current through each
entire discharge cycle. The previous average is stored in this register.
Present average discharge current. This is the average discharge current from the beginning of this discharge cycle until present time.
Average current: based off the AverageCurrent()
Current: based off of a low-pass-filtered version of AverageCurrent() (τ = 14 s)
Design capacity / 5: C Rate based off of Design Capacity /5 or a C / 5 rate in mA
Use the value specified by AtRate()
Use the value in User_Rate-mA. This provides a completely user-configurable method.
If LOAD mode = 1 (Constant Power), then the following options are available:
LoadSelect Value
0 (default)
1
2
3
4
5
6
Table 12. CONSTANT POWER Mode Used When LOAD Mode = 1
Power Mode Used
Average discharge power from the previous cycle. There is an internal register that records the average discharge power through
each entire discharge cycle. The previous average is stored in this register.
Present average discharge power. This is the average discharge power from the beginning of this discharge cycle until the present
time.
Average current × voltage: based off the AverageCurrent() and Voltage()
Current × voltage: based off of a low-pass-filtered version of AverageCurrent() (τ = 14 s) and Voltage()
Design energy / 5: C Rate based off of Design Energy /5 or a C / 5 rate in mA
Use the value specified by AtRate()
Use the value in User_Rate-mW/cW. This provides a completely user- configurable method.
Reserve Cap-mAh
Reserve Cap-mAh determines how much actual remaining capacity exists after reaching 0
RemainingCapacity(), before Terminate Voltage is reached. A loaded rate or no-load rate of compensation can
be selected for Reserve Cap by setting the [RESCAP] bit in the Pack Configuration register.
Reserve Cap-mWh/cWh
Reserve Cap-mWh determines how much actual remaining capacity exists after reaching 0 AvailableEnergy(),
before Terminate Voltage is reached. A loaded rate or no-load rate of compensation can be selected for
Reserve Cap by setting the [RESCAP] bit in the Pack Configuration register.
Design Energy Scale
Design Energy Scale is used to select the scale/unit of a set of data flash parameters. The value of Design
Energy Scale can be either 1 or 10 only.
Table 13. Data Flash Parameter Scale/Unit-Based on Design Energy Scale
Data Flash
Design Energy
Reserve Capacity –mWh/cWh
Avg Power Last Run
User Rate-mW/cW
T Rise
Design Energy Scale = 1 (default)
mWh
mWh
mW
mWh
No Scale
Design Energy Scale = 10
cWh
cWh
cW
cWh
Scaled by x10
Dsg Current Threshold
This register is used as a threshold by many functions in the bq28z560-R1 to determine if actual discharge
current is flowing into or out of the cell. The default for this register should be sufficient for most applications.
This threshold should be set low enough to be below any normal application load current but high enough to
prevent noise or drift from affecting the measurement.
Copyright © 2013, Texas Instruments Incorporated
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