The bqJUNIOR series are highly accurate stand-alone single-cell Li-Ion and Li-Pol battery capacity monitoring and reporting devices targeted at space-limited, portable applications. The IC monitors a voltage drop across a small current sense resistor connected in series with the battery to determine charge and discharge activity of the battery. Compensations for battery age, temperature, self-discharge, and discharge rate are applied to the capacity measurments to provide available time-to-emptyinformation across a wide range of operating conditions. Battery capacity is automatically recalibrated, or learned, in the course of a discharge cycle from full to empty. Internal registers include current, capacity, time-to-empty, state-of-charge, cell temperature and voltage, status, and more.
The bqJUNIOR can operate directly from single-cell Li-Ion and Li-Pol batteries and communicates to the system over a HDQ one-wire or I2C serial interface.
HDQ (bq27010) or I2C (bq27210) Communication
Reports Accurate Time-to-Empty At Both Measured and Host-Requested Load Values
Reports Available Capacity Compensated for Discharge Rate, Temperature, and Age
End-of-Discharge Voltage Compensated for Discharge Rate and Temperature
Automatic Capacity Reduction with Age
Reports Temperature, Voltage, and Current
High Accuracy Charge and Discharge Current Integration with Automatic Offset Calibration
Requires No User Calibration
Programmable Input/Output Port
Internal User EEPROM Configuration Memory
Uploadable Coefficients Allows Host-Side Use with Multiple Pack Characteristics
Stable Oscillator Without External Components
Dynamic End-of-Discharge Detection Delay to Allow Use in a High-Dynamic Load Environment
Automatic Sleep Mode When Communication Lines are Low