FEATURES
· 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

DESCRIPTION
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.