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-empty information 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
• Available in a Small 3 mm x 4 mm QFN Package
• Five Low-Power Operating Modes
  • Active: < 90 µA
  • Sleep: < 2.5 µA
  • Ship: < 2 µA (bq27010 only)
  • Hibernate: < 1.5 µA
  • Data Retention: < 20 nA
• APPLICATIONS
  • PDA
  • Smart Phones
  • MP3 Players
  • Digital Cameras
  • Internet Appliances
  • Handheld Devices

bqJUNIOR is a trademark of Texas Instruments.