BQ2060A_15 Datasheet, PDF (17/61 Pages) Texas Instruments – SBS v1.1-Compliant Gas Gauge IC

bq2060A
www.ti.com
SLUS500D – OCTOBER 2001 – REVISED OCTOBER 2011
In either mode, the bq2060A blinks the LED display if RemainingCapacity() is less than Remaining
CapacityAlarm(). The display is disabled if EDV0 = 1.
Secondary Protection for Li-ion
The bq2060A has two pins, CFC and DFC, that can be used for secondary override control of a Li-ion protector
or for blowing a fuse to disable the battery pack. The CFC pin is the Charge FET Control pin for secondary
protector control or for blowing a fuse. The DFC pin is the Discharge FET Control pin for secondary protector
control. Discharge current can cause an override of the CFC control, and charge current can cause an override
of the DFC control. The CVOV, CVUV, and the true logic state of the CFC and DFC pins can be read in the
lower nibble of Pack Status.
The CVOV status flag is set if Voltage() ≥ ChargingVoltage() + Overvoltage Margin, any VCELL voltage ≥Cell
Overvoltage threshold, or if Temperature() ≥ MaxT. When CVOV = 1 and Miscellaneous Options bit 6 = 0, the
CFC pin is pulled low unless the DISCHARGING bit in BatteryStatus() is set. If Temperature > Safety
Overtemperature threshold, then it is pulled low even if the Discharging bit in BatteryStatus() is set.
The formula for this description is:
CFC = SOT
or
CVOV + DSG + MISC OPTION BIT 6
If Miscellaneous Options bit 6 = 1, the CFC pin is pulled low only if Temperature() > Safety Overtemperature
threshold.
Table 6. Alarm and Status Bit Summary⁽¹⁾
BATTERY STATE
Overcurrent
Overvoltage
Over temperature
Overcharge
CONDITIONS
C() ≥ CC() +Overcurrent Margin
V() ≥ CV() + Overvoltage Margin
VCELL1, 2, 3, or 4 > Cell Over Voltage
T() ≥ MaxT
Capacity added after
RM() = FCC() ≥
Maximum Overcharge
CC() STATE AND
BatteryStatus BIT SET
CC() = 0, TCA = 1
TCA = 1
CC() = 0, CVOV = 1
CC() = 0, OTA = 1,
TCA = 1, CVOV = 1
CC() = 0, FC = 1
OCA = 1, TCA = 1
Undertemperature
T() < 0°C
CC() = 0
Fast-charge
termination
Fully discharged
Overdischarged
Low capacity
Low run-time
ΔT/Δt or Current Taper
V() ≤ EDV2 or
RM() < FCC() *Battery Low%
V() ≤ EDV0
VCELL1, 2, 3 or 4 < Cell
Under Voltage
RM() = 0
RM() < RCA()
ATTE() < RTA()
CC() = Maintenance
Charging Current,
FC = 1
TCA = 1
FD = 1
TDA = 1
TDA = 1, CVUV = 1
TDA = 1
RCA = 1
RTA = 1
CC() = FAST OR PRECHARGE
CURRENT AND/OR
BITS CLEARED
C() < CC() + Overcurrent Margin
DISCHARGING = 1
V() < CV() + Overvoltage Margin
Li-ion cell voltage ≤ Cell Over Voltage
T() ≤MaxT – 5°C or T() ≤ 43°C
RSOC() < Fully Charged Cleared %
DISCHARGING = 1
0°C ≤ T() < 5°C,
CC() = Pre-Charge Current;
T() ≥ 5°C,
CC() = Fast-Charging Current
RSOC() < Fully Charged Cleared %
DISCHARGING = 1 or termination
condition is no longer valid.
RSOC() > 20%
V() > EDV0
VCELL1, 2, 3, or 4 ≥ Cell Under Voltage
RM() > 0
RM() ≥ RCA()
ATTE() ≥ RTA()
(1) C() = Current(), CV() = ChargingVoltage(), CC() = ChargingCurrent(), V() = Voltage(), T() = Temperature(), TCA =
TERMINATE_CHARGE_ALARM, OTA = OVER_TEMPERATURE_ALARM, OCA = OVER_CHARGED_ALARM, TDA =
TERMINATE_DISCHARGE_ALARM, FC = FULLY_CHARGED, FD = FULLY_DISCHARGED, RSOC() = RelativeStateOfCharge(). RM()
= RemainingCapacity(), RCA = REMAINING_CAPACITY_ALARM, RTA = REMAINING_TIME_ALARM, ATTE() =
AverageTimeToEmpty(), RTA() = RemainingTimeAlarm(), RCA() = RemainingCapacityAlarm(), FCC() = FullChargeCapacity().
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