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.