BQ27000 Datasheet, PDF (1/29 Pages) Texas Instruments – SINGLE CELL Li-Ion AND Li-Pol BATTERY GAS GAUGE IC FOR PORTABLE APPLICATIONS (bqJUNIOR)

bq27000, bq27200
www.ti.com
SLUS556B – SEPTEMBER 2004 – REVISED NOVEMBER 2004
SINGLE CELL Li-Ion AND Li-Pol BATTERY GAS GAUGE IC FOR PORTABLE
APPLICATIONS (bqJUNIOR™)
FEATURES
• 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
• 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
DESCRIPTION
The bqJUNIOR series are highly accurate
stand-alone single-cell Li-Ion and Li-Pol battery ca-
pacity 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. Compen-
sations for battery temperature, self-discharge, and
discharge rate are applied to the capacity
measurments to provide available time-to-empty in-
formation across a wide range of operating con-
ditions. 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.
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, Texas Instruments Incorporated