BQ2060A_15 Datasheet, PDF (15/61 Pages) Texas Instruments – SBS v1.1-Compliant Gas Gauge IC

bq2060A
www.ti.com
SLUS500D – OCTOBER 2001 – REVISED OCTOBER 2011
Pre-Charge Qualification
The bq2060A sets ChargingCurrent() to the pre-charge rate as programmed in Pre-Charge Current EE
0x1e–0x1f under the following conditions:
• Voltage: The bq2060A requests the pre-charge charge rate when Voltage() drops below the EDV0 threshold
(compensated or fixed EDVs). Once requested, a pre-charge rate remains until Voltage() increases above the
EDVF threshold. The bq2060A also broadcasts the pre-charge value immediately after a device reset until
Voltage() is above the EDVF threshold. This threshold is programmed in EDVF/EDV0 EE 0x72–0x73.
• Temperature: The bq2060A requests the pre-charge rate when Temperature() is between 0°C and 5°C.
Temperature() must rise above 5°C before the bq2060A requests the fast-charge rate.
Charge Suspension
The bq2060A may temporarily suspend charge if it detects a charging fault. A charging fault includes the
following conditions.
• Overcurrent: An overcurrent condition exists when the bq2060A measures the charge current to be more
than the Overcurrent Margin above the ChargingCurrent(). Overcurrent Margin is programmed in EE 0x49.
On detecting an overcurrent condition, the bq2060A sets the ChargingCurrent() to zero and sets the
TERMINATE_CHARGE_ALARM bit in BatteryStatus(). The overcurrent condition and TERMINATE_
CHARGE_ALARM are cleared when the measured current drops below the ChargingCurrent plus the
Overcurrent Margin.
• Overvoltage: An overvoltage condition exists when the bq2060A measures the battery voltage to be more
than the Overvoltage Margin above the ChargingVoltage() or a Li-ion cell voltage has exceeded the
overvoltage limit programmed in Cell Under-/Overvoltage. Overvoltage Margin is programmed in EE 0x48 and
Cell Under-/Overvoltage in EE 0x4a. On detecting an overvoltage condition, the bq2060A sets the
ChargingCurrent() to zero and sets the TERMINATE_CHARGE_ALARM bit in BatteryStatus(). The bq2060A
clears the TERMINATE_ CHARGE_ALARM bit when it detects that the battery is no longer being charged
(DISCHARGING bit set in BatteryStatus()). The bq2060A continues to broadcast zero charging current until
the overvoltage condition is cleared. The overvoltage condition is cleared when the measured battery voltage
drops below the ChargingVoltage() plus the Overvoltage Margin or when the CVOV bit is reset.
• Overtemperature: An overtemperature condition exists when Temperature() is greater than or equal to the
MaxT value programmed in EE 0x45 (most significant nibble). On detecting an overtemperature condition, the
bq2060A sets the ChargingCurrent() to zero and sets the OVER_TEMP_ALARM and
TERMINATE_CHARGE_ ALARM bit in BatteryStatus() and the CVOV bit in Pack Status. The
overtemperature condition is cleared when Temperature() is equal to or below (MaxT – 5°C). The
temperature set by MaxT is increased by 16°C if bit 5 in Miscellaneous Options is set.
• Overcharge: An overcharge condition exists if the battery is charged more than the Maximum Overcharge
value after RM = FCC. Maximum Overcharge is programmed in EE 0x2e–0x2f. On detecting an overcharge
condition, the bq2060A sets the ChargingCurrent() to zero and sets the OVER_CHARGED_ALARM,
TERMINATE_CHARGE_ ALARM, and FULLY_CHARGED bits in BatteryStatus(). The bq2060A clears the
OVER_ CHARGED_ALARM and TERMINATE_CHARGE_ ALARM when it detects that the battery is no
longer being charged. The FULLY_CHARGED bit remains set and the bq2060A continues to broadcast zero
charging current until RelativeStateOfCharge() is less than Fully Charged Clear% programmed in EE 0x4c.
The counter used to track overcharge capacity is reset with 2 mAh of discharge.
• Undertemperature: An undertemperature condition exists if Temperature() < 0°C. On detecting an under
temperature condition, the bq2060A sets ChargingCurrent() to zero. The bq2060A sets ChargingCurrent() to
the appropriate pre-charge rate or fast-charge rate when Temperature() ≥ 0°C.
Voltage()
Table 5. Midrange Corrections
CONDITION
≥ VOC75 and RelativeStateOfCharge() ≤ 63%
< VOC75 and RelativeStateOfCharge() ≥ 87%
≥VOC50 and RelativeStateOfCharge() ≤ 38%
<VOC50 and RelativeStateOfCharge() ≥ 62%
≥ VOC25 and RelativeStateOfCharge() ≤ 13%
< VOC25 and RelativeStateOfCharge() ≥ 37%
RESULT
RelativeStateOfCharge()→75%
RelativeStateOfCharge()→75%
RelativeStateOfCharge()→50%
RelativeStateOfCharge()→50%
RelativeStateOfCharge()→25%
RelativeStateOfCharge()→25%
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