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SLUS556D – SEPTEMBER 2004 – REVISED MARCH 2006
SINGLE CELL Li-Ion AND Li-Pol BATTERY GAS GAUGE IC FOR PORTABLE
APPLICATIONS (bqJUNIOR)
FEATURES
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HDQ (bq27000) or I
2
C (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
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PDA
Smart Phones
MP3 Players
Digital Cameras
Internet Appliances
Handheld Devices
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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
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 I
2
C serial interface.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
bqJUNIOR is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2006, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
