BQ2084-V140_14 Datasheet, PDF (59/64 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE FOR USE WITH THE bq29312

bq2084-V140
www.ti.com
SLUS664B – JULY 2005 – REVISED AUGUST 2006
Safety OverTemperature Discharge
Safety OverTemperature Discharge DF 0x77-0x78 sets the temperature, in degrees C/10, above which, during
discharging, the pack enters permanent failure, if the XSOTD bit in Permanent Failure Configuration is set.
Charge Detection Current
Charge Detection Current DF 0x113-0x114 sets the threshold in milliamperes for detecting charge current. This
is a signed value and is positive. This threshold is used for detecting cross-conduction, and ensuring that charge
termination is not improperly detected due to loss of charging current.
Discharge Detection Current
Discharge Detection Current DF 0x115-0x116 sets the threshold in milliamperes for detecting discharge current.
This is a signed value and is negative. This threshold is used for detecting cross-conduction and determining
that the charge FET should be turned on during discharge to reduce IR losses.
FET Fail Charge Current
FET Fail Charge Current DF 0x125-0x126 sets the threshold in milliamperes for detecting current in a charge
FET which is turned off. This is a signed value and is positive.
FET Fail Discharge Current
FET Fail Discharge Current DF 0x127-0x128 sets the threshold in milliamperes for detecting current in a
discharge FET which is turned off. This is a signed value and is negative.
FET Fail Time
FET Fail Time DF 0x129 sets the time in seconds that current must be detected in a FET which is turned off, in
order to determine that the FET has failed.
Terminate Voltage
Terminate Voltage DF 0x67-0x68, sets the threshold below which the Terminate Discharge Alarm bit is set. The
alarm is cleared when the voltage rises above this threshold, if the CVUV bit in Pack Status is not set.
Offsets and Limits
Temperature offset
Temperature offset DF 0xd6, contains a signed offset for the pack's temperature measurements, in degrees
C/10. It is set at board test during pack calibration.
Board offset
Board offset DF 0xd7, contains a signed offset for the pack's coulomb counter measurements. If used, it is set at
board design time.
Current Deadband
Current Deadband DF 0x7b, sets the threshold in mA below which a current measurement is not detected.
Shutdown Voltage
Shutdown Voltage DF 0x7c-0x7d sets the pack voltage below which the pack's electronics, including the
bq2084-V140, is shut down to conserve power. All FETs are turned off by the AFE.
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