BQ3060 Datasheet, PDF (12/17 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE and PROTECTION with CEDV

bq3060
SLUS928A – MARCH 2009 – REVISED NOVEMBER 2009
FEATURE SET
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Primary (1st Level) Safety Features
The bq3060 supports a wide range of battery and system protection features that can easily be configured. The
primary safety features include:
• Cell over/undervoltage protection
• Charge and discharge overcurrent
• Short circuit
• Charge and discharge overtemperature
• AFE Watchdog
Secondary (2nd Level) Safety Features
The secondary safety features of the bq3060 can be used to indicate more serious faults via the FUSE (pin 21).
This pin can be used to blow an in-line fuse to permanently disable the battery pack from charging and
discharging. This pin is also used as an input to sense the state of the fuse. The secondary safety protection
features include:
• Safety overvoltage
• Safety overcurrent in charge and discharge
• Safety overtemperature in charge and discharge
• Charge FET and Zero-Volt Charge FET fault
• Discharge FET fault
• Cell imbalance detection
• Fuse blow by a secondary voltage protection IC
• AFE register integrity fault (AFE_P)
• AFE communication fault (AFE_C)
Charge Control Features
The bq3060 charge control features include:
• Supports JEITA temperature ranges. Reports charging voltage and charging current according to the active
temperature range.
• Handles more complex charging profiles. Allows for splitting the standard temperature range into 2
sub-ranges and allows for varying the charging current according to the cell voltage.
• Reports the appropriate charging current needed for constant current charging and the appropriate charging
voltage needed for constant voltage charging to a smart charger using SMBus broadcasts.
• Reduce the charge difference of the battery cells in fully charged state of the battery pack gradually using a
voltage-based cell balancing algorithm during charging. A voltage threshold can be set up for cell balancing to
be active. This prevents fully charged cells from overcharging and causing excessive degradation and also
increases the usable pack energy by preventing premature charge termination
• Supports pre-charging/zero-volt charging
• Supports charge inhibit and charge suspend if battery pack temperature is out of temperature range
• Reports charging fault and also indicate charge status via charge and discharge alarms.
Gas Gauging
The bq3060 uses advanced CEDV (Compensated End-of-Discharge Voltage) technology to measure and
calculate the available capacity in battery cells. The bq3060 accumulates a measure of charge and discharge
currents and compensates the charge current measurement for temperature and state-of-charge of the battery.
The bq3060 estimates self-discharge of the battery and also adjusts the self-discharge estimation based on
temperature.
See bq3060 Technical Reference(SLUU319) for further details.
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