BQ26500 Datasheet, PDF (1/27 Pages) Texas Instruments – SINGLE-CELL LI-ION AND BATTERY GAS GAUGE IC FOR HANDHELD APPLICATIONS

bq26500
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SLUS567A − JUNE, 2003 − REVISED OCTOBER 2003
SINGLEĆCELL LIĆION AND LIĆPOL BATTERY GAS GAUGE IC
FOR HANDHELD APPLICATIONS (bqJUNIORt FAMILY)
FEATURES
D Reports Accurate State-of-Charge in Li-Ion
and Li-Pol Cells, No System Processor
Calculations Needed
D Reports Cell Temperature and Voltage
D High-Accuracy Coulometric Charge and
Discharge Current Integration with
Automatic Offset Cancellation
D Requires No Offset Calibration
D Programmable Input/Output Port
D Internal Time-Base Eliminates External
Crystal Oscillator
D Four Automatic Low-Power Operating Modes
− Active: < 100 µA
− Sleep: < 2.5 µA
− Ship: < 1.7 µA
− Hibernate: < 1.5 µA
D Small 8-Pin TSSOP Package
SIMPLIFIED APPLICATION
PACK+
HDQ
PACK−
bq26500
1 RBI GPIO 8
2 VCC SRP 7
3 VSS SRN 6
4 HDQ BAT 5
Protection
Controller
UDG−03038
Li-Ion
or
+ ^Li-Pol
APPLICATIONS
D PDAs
D Smart Phones
D MP3 Players
D Digital Cameras
D Internet Appliances
D Handheld Devices
DESCRIPTION
The bq26500, the first in the bqJUNIORt family
of advanced gas gauge device for handhald
applications, is a highly accurate standalone
single-cell Li-Ion and Li-Pol battery capacity
monitoring and reporting device targeted at space
limited portable applications. The device 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 rate of discharge are applied
to the charge counter to provide available capacity
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 available
capacity, cell temperature and voltage,
state-of-charge, and status and control registers.
The bq26500 can operate directly from single-cell
Li-Ion and Li-Pol batteries and communicates to
the system over a simple one-wire bi-directional
serial interface. The 5-kbits/s HDQ bus interface
reduces communication overhead in the external
microcontroller.
Battery Pack
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright  2003, Texas Instruments Incorporated
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