BQ2010SN- Datasheet

IC型號：
BQ2010SN-
PDF描述：
Gas Gauge IC
文件大小：
184.67KB
PDF頁數(shù)：
20頁
芯片廠家：
TI

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bq2010

Gas Gauge IC

Features

鉃?/div>

Conservative and repeatable

measurement of available charge

in rechargeable batteries

鉃?/div>

Designed for battery pack inte-

gration

General Description

The bq2010 Gas Gauge IC is intended

for battery-pack or in-system installa-

tion to maintain an accurate record of

a battery's available charge. The IC

monitors a voltage drop across a

sense resistor connected in series be-

tween the negative battery terminal

and ground to determine charge and

discharge activity of the battery.

NiMH and NiCd battery self-dis-

charge is estimated based on an inter-

nal timer and temperature sensor.

Compensations for battery tempera-

ture and rate of charge or discharge

are applied to the charge, discharge,

and self-discharge calculations to pro-

vide available charge information

across a wide range of operating con-

ditions. Battery capacity is automati-

cally recalibrated, or 鈥渓earned,鈥?in the

course of a discharge cycle from full to

empty.

Nominal available charge may be

directly indicated using a five- or

six-segment LED display. These seg-

ments are used to indicate graphi-

cally the nominal available charge.

The bq2010 supports a simple

single-line bidirectional serial link to

an external processor (common

ground). The bq2010 outputs battery

information in response to external

commands over the serial link.

The bq2010 may operate directly

from 3 or 4 cells. With the REF out-

put and an external transistor, a sim-

ple, inexpensive regulator can be built

to provide V

across a greater

number of cells.

Internal registers include available

charge, temperature, capacity, battery

ID, battery status, and programming

pin settings. To support subassembly

testing, the outputs may also be con-

trolled. The external processor may

also overwrite some of the bq2010

gas gauge data registers.

120碌A(chǔ) typical standby current

Small size enables imple-

mentations in as little as

1 2

square inch of PCB

鉃?/div>

Integrate within a system or as a

stand-alone device

Display capacity via single-

wire serial communication

port or direct drive of LEDs

鉃?/div>

Measurements compensated for

current and temperature

鉃?/div>

Self-discharge compensation us-

ing internal temperature sensor

鉃?/div>

Accurate measurements across a

wide range of current (> 500:1)

鉃?/div>

16-pin narrow SOIC

Pin Connections

Pin Names

LCOM

LED common output

REF

EMPTY

DISP

Voltage reference output

No connect

Serial communications

input/output

Empty battery indicator

output

Battery sense input

Display control input

Sense resistor input

3.0鈥?.5V

System ground

SEG

/PROG

LED segment 1/

program 1 input

SEG

/PROG

LED segment 2/

program 2 input

SEG

/PROG

LED segment 3/

program 3 input

SEG

/PROG

LED segment 4/

program 4 input

SEG

/PROG

LED segment 5/

program 5 input

SEG

/PROG

LED segment 6/

program 6 input

LCOM

SEG1/PROG1

SEG2/PROG2

SEG3/PROG3

SEG4/PROG4

SEG5/PROG5

SEG6/PROG6

VSS

VCC

REF

EMPTY

DISP

16-Pin Narrow SOIC

PN201001.eps

4/95 D

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