BQ28Z560-R1 datasheet(35/60 Pages) TI1

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bq28z560-R1

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SLUSBD3 – APRIL 2013

Avg P Last Run

The bq28z560-R1 logs the power averaged from the beginning to the end of each discharge cycle. It stores this

average power from the previous discharge cycle in this register. To get a correct average power reading, the

bq28z560-R1 continuously multiplies instantaneous current times Voltage() to get power. It then logs this data to

derive the average power. This register should never need to be modified. It is only updated by the bq28z560-R1

when required.

Delta Voltage

The bq28z560-R1 stores the maximum difference of Voltage() during short load spikes and normal load, so the

Impedance Track algorithm can calculate remaining capacity for pulsed loads.

NOTE

It is not recommended to change this value.

Ra Tables and Ra Filtering Related Parameters

These tables contain encoded data and are automatically updated during device operation. The bq28z560-R1

has a filtering process to eliminate unexpected fluctuations in Ra values while the Ra values are being updated.

The DF parameters RaFilter, RaMaxDelta, MaxResfactor, and MinResfactor control the Filtering process of Ra

values. RaMaxDelta Limits the change in Ra values to an absolute magnitude. MinResFactor and MaxResfactor

parameters are cumulative filters that limit the change in Ra values to a scale on a per discharge cycle basis.

These values are data flash configurable. No further user changes should be made to Ra values except for

reading/writing the values from a pre-learned pack (part of the process for creating golden image files).

MaxScaleBackGrid

The MaxScaleBackGrid parameter limits the resistance grid point after which back scaling will not be performed.

This variable ensures that the resistance values in the lower resistance grid points remain accurate while the

battery is at a higher DoD state.

Max DeltaV, Min DeltaV

This is the Maximal/Minimal value allowed for delta V, which will be subtracted from simulated voltage during

remaining capacity simulation.

Qmax Max Delta %

This is the maximal change of Qmax during one update, as a percentage of Design Capacity. If the gauge

attempts to change the Qmax value and this delta change value exceeds the Qmax Max delta % limit, the

change value will be capped to the old value ± DesignCapacity×QmaxMaxDelta/100.

Fast Resistance Scaling

This new algorithm improves convergency of Remaining Capacity and terminates voltage at end of discharge.

The algorithm is enabled when cell voltage goes below (Terminate Voltage + Term V Delta) or StateofCharge()

goes below Fast Scale Start SOC. For most applications, the default value of Term V Delta and Fast Scale Start

SOC are recommended.

DeltaV Max Delta

This is the maximal change of the Delta V value. If an attempted change of the value exceeds this limit, the

change value will be capped to the old value ±DeltaV Max Delta.

Lifetime Data Logging Parameters

NOTE

IT_ENABLE must be enabled (Command 0x0021) for Lifetime Data logging functions to

be active.

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