BQ2085-V1P3 Datasheet, PDF (17/57 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

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Table 7. Display Mode for Five LEDs
bq2085-V1P3
SLUS598 − FEBRUARY 2004
CONDITION RELATIVE OR ABSOLUTE
StateOfCharge( )
EDV0 = 1
<20%
≥20%, < 40%
≥40%, < 60%
≥60%, < 80%
≥80%
LED1
OFF
ON
ON
ON
ON
ON
FIVE-LED DISPLAY OPTION
LED2 LED3 LED4
OFF OFF OFF
OFF OFF OFF
ON
OFF OFF
ON
ON
OFF
ON
ON
ON
ON
ON
ON
LED5
OFF
OFF
OFF
OFF
OFF
ON
Table 8. Display Mode for Four LEDs
CONDITION RELATIVE OR ABSOLUTE
StateOfCharge( )
EDV0 = 1
<25%
≥25%, < 50%
≥50%, < 75%
≥75%
FOUR-LED DISPLAY OPTION
LED1 LED2 LED3 LED4
OFF OFF OFF OFF
ON
OFF OFF OFF
ON
ON
OFF OFF
ON
ON
ON
OFF
ON
ON
ON
ON
Table 9. Display Mode for Three LEDs
CONDITION RELATIVE OR ABSOLUTE
StateOfCharge( )
EDV0 = 1
<34%
≥34%, < 67%
≥67%
THREE-LED DISPLAY OPTION
LED1
LED2
LED3
OFF
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
ON
ON
ON
Li-Ion Protector Control
The bq2085−V1P3 provides protection for Li-Ion batteries, as shown in Table 10. The bq2085−V1P3 uses the
bq29311 to measure and report individual series cell voltages. The bq2085−V1P3 determines if a voltage
protection condition has been breached and turns off the respective control FET via I²C communication to the
bq29311. It is recommended that the bq2085−V1P3 protection control be validated by two successive
measurements by setting VOD=1 in Misc Configuration.
The bq29311 can detect and protect the load from an overcurrent (OC) or short circuit (SC). The bq29311 alerts
the bq2085−V1P3 with the XALERT output when ever an overcurrent or short circuit threshold is breached in
either the charge or discharge directions.
The bq2085−V1P3 asserts CVOV and instructs the bq29311 to turn off the charge FET if an Overvoltage or
Overtemperature condition exists, or if AverageCurrent( ) ≥ Fast-Charging Current + Over Current Margin
(Prolonged Overcurrent condition in Table 6). The bq2085−V1P3 does not turn off the charge FET if there is
a discharge current > 50 mA. The bq2085−V1P3 instructs the bq29311 to turn on the charge FET when
Overvoltage and Overtemperature conditions no longer exist, and AverageCurrent( ) < 256 mA (if Prolonged
Overcurrent generated the fault condition).
The bq2085−V1P3 asserts CVUV and instructs the bq29311 to turn off the discharge FET if an Overdischarged
condition exists, or if AverageCurrent( ) ≤ − overload current (Overload). The bq2085−V1P3 does not turn off
the discharge FET if there is a charge current ≥ 50 mA. The bq2085−V1P3 instructs the bq29311 to turn on the
discharge FET when the Overdischarged condition no longer exists and AverageCurrent( ) > −256 mA (if
Overload generated the fault condition).
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