bq26501

SLUS586B − OCTOBER 2003 − REVISED MARCH 2004

SINGLECELL LIION AND LIPOL BATTERY GAS GAUGE IC

FOR HANDHELD APPLICATIONS (bqJUNIORt FAMILY)

1

www.ti.com

FEATURES

and Li-Pol Cells, No System Processor

Calculations Needed

HDQ Engine in TI OMAP

t Processors

Discharge Current Integration with

Automatic Offset Cancellation

Crystal Oscillator

− Active: < 100

µA

− Sleep: < 2.5

µA

− Ship: < 1.7

µA

− Hibernate: < 1.5

µA

APPLICATIONS

DESCRIPTION

The bq26501, the first in the bqJUNIOR

t 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.

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

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.

UDG−03038

SIMPLIFIED APPLICATION

1

2

3

4

8

7

6

5

GPIO

SRP

SRN

BAT

RBI

VCC

VSS

HDQ

bq26501

Protection

Controller

+

HDQ

PACK−

PACK+

Battery Pack

Li-Ion

or

Li-Pol