BQ34Z100 Datasheet, PDF (17/50 Pages) Texas Instruments – Wide Range Fuel Gauge with Impedance Track™ Technology

bq34z100
www.ti.com
SLUSAU1 – MAY 2012
Load Select Value
0
1 (default)
2
3
4
5
6
Table 8. Current Model Used when Load Mode = 0
Current Model 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 on the AverageCurrent()
Current: based on a low-pass-filtered version of AverageCurrent() (τ=14s)
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 gives a completely user configurable method.
If Load Mode = 1 (Constant Power) then the following options are available:
Load Select Value
0 (default)
1
2
3
4
5
6
Table 9. Constant-Power Model Used when Load Mode = 1
Power Model Used
Average discharge power from 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 present time.
Average Current × Voltage: based off the AverageCurrent() and Voltage().
Current × Voltage: based on a low-pass-filtered version of AverageCurrent() (τ=14s) and Voltage()
Design Energy / 5: C Rate based off of Design Energy /5 or a C / 5 rate in mA .
Use whatever value specified by AtRate().
Use the value in User_Rate-mW/cW. This gives 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.
When using Design Energy Scale = 10, the value for each of the parameters in Table 10 must be adjusted to
reflect the new units. See X10 MODE.
Table 10. Data Flash Parameter Scale/Unit-Based on Design Energy Scale
Data Flash Parameter
Design Energy
Reserve Energy-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
Copyright © 2012, Texas Instruments Incorporated
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