Texas Instruments bq2050H Data Sheet

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bq2050H

Low-Cost Lithium Ion Power Gauge™ IC

ments are used to graphically indi-

Features General Description

cate available capacity. The Accurate measurement of avail- The bq2050H Lithium Ion Power bq2050H also supports simple able capacity in Lithium Ion bat- Gauge™ IC is intended for battery- single-line bidirectional serial link teries pack or in-system installation to to an external processor (common maintain an accurate record of ground). The 5kb HDQ bus interface

Provides a low-cost battery man-

available battery capacity. The IC reduces communications overhead

agement solution for pack

monitors voltage drop across in the external microcontroller.

integration

sense resistor connected in series

Internal registers include available

Complete circuit can fit in as between the negative battery termi-

capacity, temperature, scaled avail-

little as square inch of PCB nal and ground to determine

able energy, battery ID, battery

charge and discharge activity of

Low operating current (120µA status, and Li-Ion charge FET

the battery. Compensations for bat-

typical) status. The external processor may

tery temperature, self discharge,

also overwrite some of the bq2050H

Less than 100n A of data and rate of discharge are applied to

power gauge data registers.

retention current the charge counter to provide avail-

able capacity information across

The bq2050H can operate from the

High-speed (5kb) single-wire

wide range of operating conditions.

batteries in the pack. The REF out-

communication interface (HDQ

Battery capacity is automatically re-

put and an external transistor allow

bus) for critical battery

calibrated, or “learned,” in the

simple, inexpensive voltage regu-

parameters

course of discharge cycle from full

lator to supply power to the circuit

Monitors and controls charge FET to empty.

from the cells.

in Li-Ion pack protection circuit

Nominal available capacity may be Direct drive of remaining capacity directly indicated using five- LEDs segment LED display. These seg-

Measurements automatically compensated for rate and temperature

16-pin narrow SOIC

Pin Connections Pin Names

LCOM LED common output VSS System ground

SEG1/PROG1 LED segment 1/ SR Sense resistor input program input

LCOM VCC

DISP Display control input

SEG1/PROG1 REF SEG2/PROG2 LED segment 2/

program input SB Battery sense input

SEG2/PROG2 PSTAT

SEG3/PROG3 HDQ SEG3/PROG3 LED segment 3/ RBI Register backup input

program input

SEG4/PROG4 RBI

HDQ Serial communications

SEG5/PROG5 SB SEG4/PROG4 LED segment 4/ input/output

program input

CFC DISP

PSTAT Protector status input

VSS SR SEG5/PROG5 LED segment 5/

program input REF Voltage reference output

16-Pin Narrow SOIC

PN2050H1.eps CFC Charge FET control VCC Supply voltage

output

SLUS150–MAY 1999 D