BQ28Z560-R1 datasheet(26/60 Pages) TI1

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bq28z560-R1

SLUSBD3 – APRIL 2013

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NominalAvailableCapacity(): 0x0c/0x0d

This read-only command pair returns the uncompensated (less than C/20 load) battery capacity remaining. Units

are mAh.

FullAvailableCapacity(): 0x0e/0x0f

This read-only command pair returns the uncompensated (less than C/20 load) capacity of the battery when fully

charged. Units are mAh. FullAvailableCapacity() is updated at regular intervals, as specified by the Impedance

Track algorithm.

RemainingCapacity(): 0x10/0x11

This read-only command pair returns the compensated battery capacity remaining. Units are mAh.

FullChargeCapacity(): 0x12/13

This read-only command pair returns the compensated capacity of the battery when fully charged. Units are

mAh. FullChargeCapacity() is updated at regular intervals, as specified by the Impedance Track algorithm.

AverageCurrent(): 0x14/0x15

This read-only command pair returns a signed integer value that is the average current flow through the sense

resistor. It is updated every 1 s. Units are mA.

TimeToEmpty(): 0x16/0x17

This read-only function returns an unsigned integer value of the predicted remaining battery life at the present

rate of discharge, in minutes. A value of 65,535 indicates battery is not being discharged.

TimeToFull(): 0x18/0x19

This read-only function returns an unsigned integer value of predicted remaining time until the battery reaches

full charge, in minutes, based upon AverageCurrent(). The computation accounts for the taper current time

extension from the linear TTF computation based on a fixed AverageCurrent() rate of charge accumulation. A

value of 65,535 indicates the battery is not being charged.

StandbyCurrent(): 0x1a/0x1b

This read-only function returns a signed integer value of the measured standby current through the sense

resistor. The StandbyCurrent() is an adaptive measurement. Initially it reports the standby current programmed in

Initial Standby, and after spending some time in standby, reports the measured standby current.

The register value is updated every 1 s when the measured current is above the Deadband and is less than or

equal to 2 x Initial Standby. The first and last values that meet this criteria are not averaged in, since they may

not be stable values. To approximate a 1-minute time constant, each new StandbyCurrent() value is computed

by taking the approximate 93% weight of the last standby current and the approximate 7% of the current

measured average current.

StandbyTimeToEmpty(): 0x1c/0x1d

This read-only function returns an unsigned integer value of the predicted remaining battery life at the standby

rate of discharge, in minutes. The computation uses Nominal Available Capacity (NAC), the uncompensated

remaining capacity, for this computation. A value of 65,535 indicates the battery is not being discharged.

MaxLoadCurrent(): 0x1e/0x1f

This read-only function returns a signed integer value, in units of mA, of the maximum load conditions. The

MaxLoadCurrent() is an adaptive measurement, which is initially reported as the maximum load current

programmed in Initial Max Load Current. If the measured current is ever greater than Initial Max Load

Current, then MaxLoadCurrent() updates to the new current. MaxLoadCurrent() is reduced to the average of the

previous value and Initial Max Load Current whenever the battery is charged to full after a previous discharge

to an SOC less than 50%. This prevents the reported value from maintaining an unusually high value.

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