Datasheet

bq27541-G1

SLUSAL6C –NOVEMBER 2011–REVISED OCTOBER 2012

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MaxLoadCurrent( ): 0x1e/0x1f

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

system. 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.

UnfilteredRM( ): 0x20/0x21

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

FilteredRM( ): 0x22/0x23

This read-only command pair returns the filtered compensated battery capacity remaining when [SmoothEn] bit in

Operating Configuration C is set. Units are mAh.

AveragePower( ): 0x24/0x25

This read-word function returns an unsigned integer value of the average power of the current discharge. It is

negative during discharge and positive during charge. A value of 0 indicates that the battery is not being

discharged. The value is reported in units of mW (Design Energy Scale = 1) or cW (Design Energy Scale =

10).

InternalTemperature( ): 0x28/0x29

This read-only function returns an unsigned integer value of the measured internal temperature of the device in

units of 0.1K measured by the fuel gauge.

CycleCount( ): 0x2a/0x2b

This read-only function returns an unsigned integer value of the number of cycles the battery has experienced

with a range of 0 to 65,535. One cycle occurs when accumulated discharge ≥ CC Threshold.

StateOfCharge( ): 0x2c/0x2d

This read-only function returns an unsigned integer value of the predicted RemainingCapacity() expressed as a

percentage of FullChargeCapacity( ), with a range of 0 to 100%. The StateOfCharge() can be filtered or unfiltered

since RemainingCapacity() and FullChargeCapacity( ) can be filtered or unfiltered based on [SmoothEn] bit

slection.

StateOfHealth( ): 0x2e/0x2f

0x2e SOH percentage: this read-only function returns an unsigned integer value, expressed as a percentage of

the ratio of predicted FCC(25°C, SOH Load I) over the DesignCapacity(). The FCC(25°C, SOH Load I) is the

calculated full charge capacity at 25°C and the SOH current rate which is specified by SOH Load I. The range of

the returned SOH percentage is 0x00 to 0x64, indicating 0 to 100% correspondingly.

PassedCharge( ): 0x34/0x35

This signed integer indicates the amount of charge passed through the sense resistor since the last IT simulation

in mAh.

DOD0( ): 0x36/0x37

This unsigned integer indicates the depth of discharge during the most recent OCV reading.

SelfDischargeCurrent( ): 0x38/0x39

This read-only command pair returns the signed integer value that estimates the battery self discharge current.

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