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 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 (bq27000) or I2C (bq27200) Communication
● Reports Accurate _Time-to-Empty_ With Measured Load and Historical Maximum and Standby Loads
● 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
● Automatic Capacity Reduction With Age
● 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 (bq27000 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.
