bq27000

bq27010

SLUS556 – FEBRUARY 2003

SINGLECELL LIION AND LIPOL BATTERY GAS GAUGE IC

FOR PORTABLE APPLICATIONS (bqJUNIOR)

1

www.ti.com

FEATURES

and Li-Pol Cells, No System Processor

Calculations Needed

Average Current

Discharge Current Integration with

Automatic Offset Cancellation

Crystal Oscillator

– Active: < 100

µA

– Sleep: < 5

µA

– Ship: < 2

µA

– Hibernate: < 500 nA

APPLICATIONS

DESCRIPTION

The bqJUNIOR series are highly accurate

standalone single-cell Li-Ion and Li-Pol battery

capacity

monitoring

and

reporting

devices

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 time-to-empty and time-to-full

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 available time-to-empty, cell

temperature and voltage, average current, and

other status and control registers.

The

bqJUNIOR

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

interfaces

reduces

communications

overhead

in

the

external

microcontroller.

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.

Copyright

 2003, 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

TYPICAL APPLICATION

1

2

3

4

8

7

6

5

GPIO

SRP

SRN

BAT

RBI

VCC

VSS

HDQ

bqJUNIOR

Protection

Controller

+

HDQ

PACK–

PACK+

Battery Pack

C4

0.1

µF

C3

0.1

µF

C2

0.1

µF

R2

100 k

Ω

R3

100 k

Ω

C1

0.1

µF

R1

0.02

Ω

Li-Ion

or

Li-Pol