BQ3055_14 Datasheet, PDF (14/27 Pages) Texas Instruments – 2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager

bq3055
SLUSA91B – OCTOBER 2010 – REVISED OCTOBER 2013
FEATURE SET
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Primary (1st Level) Safety Features
The bq3055 supports a wide range of battery and system protection features that can easily be configured. The
primary safety features include:
• Cell Overvoltage/Undervoltage Protection
• Charge and Discharge Overcurrent
• Short-Circuit
• Charge and Discharge Over-Temperature
• AFE Watchdog
Secondary (2nd Level) Safety Features
The secondary safety features of the bq3055 can be used to indicate more serious faults via the FUSE pin. This
pin can be used to blow an in-line fuse to permanently disable the battery pack from charging or discharging. The
secondary safety protection features include:
• Safety Overvoltage
• Safety Overcurrent in Charge and Discharge
• Safety Over-Temperature in Charge and Discharge
• Charge FET, Discharge FET, and Pre-Charge FET Faults
• Cell Imbalance Detection
• Fuse Blow by Secondary Voltage Protection IC
• AFE Register Integrity Fault (AFE_P)
• AFE Communication Fault (AFE_C)
Charge Control Features
The bq3055 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 two 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 bq3055 uses the CEDV algorithm to measure and calculate the available capacity in battery cells. The
bq3055 accumulates a measure of charge and discharge currents and compensates the charge current
measurement for the temperature and state-of-charge of the battery. The bq3055 estimates self-discharge of the
battery and also adjusts the self-discharge estimation based on temperature. See the bq3055 Technical
Reference Manual (SLUU440) for further details.
Lifetime Data Logging Features
The bq3055 offers limited lifetime data logging for the following critical battery parameters:
• Lifetime Maximum Temperature
• Lifetime Minimum Temperature
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