Datasheet

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)
CC() = FAST OR PRECHARGE
CC() STATE AND
BATTERY STATE CONDITIONS CURRENT AND/OR
BatteryStatus BIT SET
BITS CLEARED
Overcurrent C() ≥ CC() +Overcurrent Margin CC() = 0, TCA = 1 C() < CC() + Overcurrent Margin
TCA = 1 DISCHARGING = 1
V() ≥ CV() + Overvoltage Margin
Overvoltage
V() < CV() + Overvoltage Margin
VCELL1, 2, 3, or 4 > Cell Over Voltage
CC() = 0, CVOV = 1
Li-ion cell voltage ≤ Cell Over Voltage
CC() = 0, OTA = 1,
Over temperature T() ≥ MaxT T() ≤MaxT – 5°C or T() ≤ 43°C
TCA = 1, CVOV = 1
Capacity added after CC() = 0, FC = 1 RSOC() < Fully Charged Cleared %
Overcharge RM() = FCC() ≥
OCA = 1, TCA = 1 DISCHARGING = 1
Maximum Overcharge
0°C ≤ T() < 5°C,
CC() = Pre-Charge Current;
Undertemperature T() < 0°C CC() = 0
T() ≥ 5°C,
CC() = Fast-Charging Current
CC() = Maintenance
Charging Current, RSOC() < Fully Charged Cleared %
Fast-charge
FC = 1
ΔT/Δt or Current Taper
termination
DISCHARGING = 1 or termination
TCA = 1
condition is no longer valid.
V() ≤ EDV2 or
Fully discharged FD = 1 RSOC() > 20%
RM() < FCC() *Battery Low%
V() ≤ EDV0 TDA = 1 V() > EDV0
VCELL1, 2, 3 or 4 < Cell
Overdischarged TDA = 1, CVUV = 1 VCELL1, 2, 3, or 4 ≥ Cell Under Voltage
Under Voltage
RM() = 0 TDA = 1 RM() > 0
Low capacity RM() < RCA() RCA = 1 RM() ≥ RCA()
Low run-time ATTE() < RTA() RTA = 1 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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