BQ28Z560-R1 datasheet(33/60 Pages) TI1

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bq28z560-R1

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SLUSBD3 – APRIL 2013

Table 11. CONSTANT CURRENT Mode Used when LOAD Mode = 0

LoadSelect Value

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.

1(default)

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:

Table 12. CONSTANT POWER Mode Used When LOAD Mode = 1

LoadSelect Value

Power Mode Used

Average discharge power from the previous cycle. There is an internal register that records the average discharge power through

0 (default)

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

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 Scale = 1 (default)

Design Energy Scale = 10

Design Energy

mWh

cWh

Reserve Capacity –mWh/cWh

mWh

cWh

Avg Power Last Run

User Rate-mW/cW

mWh

cWh

T Rise

No Scale

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.

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