bq26501
SLUS586B − OCTOBER 2003 − REVISED MARCH 2004
SINGLE CELL LI ION AND LI POL BATTERY GAS GAUGE IC
FOR HANDHELD APPLICATIONS (bqJUNIORt FAMILY)
FEATURES
D
Reports Accurate
State-of-Charge
in Li-Ion
D
D
D
D
D
D
D
and Li-Pol Cells, No System Processor
Calculations Needed
Communicates Directly With the Integrated
HDQ Engine in TI OMAPt Processors
Reports Cell Temperature and Voltage
High-Accuracy Coulometric Charge and
Discharge Current Integration with
Automatic Offset Cancellation
Requires No Offset Calibration
Programmable Input/Output Port
Internal Time-Base Eliminates External
Crystal Oscillator
Four Automatic Low-Power Operating Modes
− Active: < 100
µA
− Sleep: < 2.5
µA
− Ship: < 1.7
µA
− Hibernate: < 1.5
µA
Small 8-Pin TSSOP Package
APPLICATIONS
D
PDAs
D
Smart Phones
D
MP3 Players
D
Digital Cameras
D
Internet Appliances
D
Handheld Devices
DESCRIPTION
The bq26501, 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 bq26501 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.
D
SIMPLIFIED APPLICATION
PACK+
+
bq26501
1 RBI
2 VCC
3 VSS
HDQ
4 HDQ
BAT 5
GPIO 8
SRP 7
SRN 6
Li-Ion
or
Li-Pol
Protection
Controller
PACK−
Battery Pack
UDG−03038
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.
Copyright
2003−2004, Texas Instruments Incorporated
www.ti.com
1
TI [ TEXAS INSTRUMENTS ]
