Texas Instruments bq2050 Data Sheet/Manual

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bq2050

Lithium Ion Power Gauge™ IC

supports simple single-line bidi-

Features General Description

rectional serial link to an external Conservative and repeatable The bq2050 Lithium Ion Power processor (common ground). The measurement of available capac- Gauge™ IC is intended for battery- bq2050 outputs battery information ity in Lithium Ion rechargeable pack or in-system installation to in response to external commands batteries maintain an accurate record of over the serial link.

available battery capacity. The IC

Designed for battery pack inte- The bq2050 may operate directly

monitors voltage drop across

gration from one cell (VBAT 3V). With the

sense resistor connected in series

REF output and an external transis-

between the negative battery termi-

120µA typical operating tor, simple, inexpensive regulator

nal and ground to determine

can be built for systems with more

current charge and discharge activity of

than one series cell.

the battery. Compensations for bat-

Small size enables imple- tery temperature and rate of charge

Internal registers include available

mentations in as little as or discharge are applied to the

capacity, temperature, scaled avail-

square inch of PCB charge, discharge, and self-discharge

able energy, battery ID, battery

calculations to provide available ca-

status, and programming pin set-

Integrate within system or as

pacity information across wide

tings. To support subassembly test-

stand-alone device

range of operating conditions. Bat-

ing, the outputs may also be con-

tery capacity is automatically recali-

trolled. The external processor may

Display capacity via single-

brated, or “learned,” in the course of

also overwrite some of the bq2050

wire serial communication

discharge cycle from full to empty.

power gauge data registers.

port or direct drive of LEDs

Nominal available capacity may be

Measurements compensated for

directly indicated using five-

current and temperature

segment LED display. These seg- ments are used to graphically indi-

Self-discharge compensation us-

cate available capacity. The bq2050

ing internal temperature sensor

16-pin narrow SOIC

Pin Connections Pin Names

LCOM LED common output REF Voltage reference output

SEG1/PROG1 LED segment 1/ N/C No connect

LCOM VCC

program 1 input

SEG1/PROG1 REF DQ Serial communications

SEG2/PROG2 LED segment 2/ input/output

SEG2/PROG2 N/C

program 2 input

SEG3/PROG3 DQ RBI Register backup input

SEG3/PROG3 LED segment 3/

SEG4/PROG4 RBI

program 3 input SB Battery sense input

SEG5/PROG5 SB

SEG4/PROG4 LED segment 4/ DISP Display control input

PROG6 DISP program 4 input

SR Sense resistor input

VSS SR

SEG5/PROG5 LED segment 5/ program 5 input VCC 3.0–6.5V

16-Pin Narrow SOIC

PN205001.eps PROG6 Program 6 input VSS System ground