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BQ2012

更新时间： 2024-10-27 22:48:27

品牌	Logo	应用领域
德州仪器 - TI		仪表
页数	文件大小	规格书
20页	188K
描述
Gas Gauge IC With Slow-Charge Control

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中文翻译

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BQ2012 数据手册

bq2012

Gas Gauge IC With

Slow-Charge Control

means of controlling charge based

Features

General Description

on the battery's charge state.

➤ Conservative and repeatable

measurement of available charge

in rechargeable batteries

The bq2012 Gas Gauge IC is in-

tended for battery-pack or in-system

installation to maintain an accurate

record of available battery charge.

The IC monitors a voltage drop

across a sense resistor connected in

series between the negative battery

terminal and ground to determine

charge and discharge activity of the

battery.

Nominal available charge may be di-

rectly indicated using a five- or six-

segment LED display. These seg-

ments are used to graphically indi-

cate nominal available charge.

➤ Charge control output

➤ Designed for battery pack inte-

The bq2012 supports a simple

single-line bidirectional serial link to

an external processor (common

ground). The bq2012 outputs battery

information in response to external

commands over the serial link.

gration

- ¹²⁰µA typical standby current

(self-discharge estimation mode)

Self-discharge of NiMH and NiCd

batteries is estimated based on an

internal timer and temperature sen-

sor. Compensations for battery tem-

perature and rate of charge or dis-

charge are applied to the charge,

discharge, and self-discharge calcu-

lations to provide available charge

information across a wide range of

operating conditions. Battery capac-

ity is automatically recalibrated, or

“learned,” in the course of a dis-

charge cycle from full to empty.

- ^{Small size enables imple-}

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 bq2012 gas

gauge data registers.

mentations in as little as

square inch of PCB

➤ Integrate within a system or as a

stand-alone device

- ^{Display capacity via single-}

wire serial communication

port or direct drive of LEDs

The bq2012 may operate directly

from three or four cells. With the

REF output and an external transis-

tor, a simple, inexpensive regulator

can be built to provide V_CCacross a

greater number of cells.

➤ Measurements compensated for

current and temperature

The bq2012 includes a charge con-

trol output that, when used with

other full-charge safety termination

methods, can provide a cost-effective

➤ Self-discharge compensation us-

ing internal temperature sensor

➤ 16-pin narrow SOIC

Pin Connections

Pin Names

LCOM

LED common output

REF

CHG

Voltage reference output

Charge control output

SEG₁/PROG₁LED segment 1/

program 1 input

LCOM

SEG /PROG

REF

CHG

Serial communications

input/output

SEG₂/PROG₂LED segment 2/

program 2 input

SEG /PROG

EMPTY

Empty battery indicator

output

SEG /PROG

SEG₃/PROG₃LED segment 3/

program 3 input

SEG /PROG

EMPTY

Battery sense input

Display control input

Sense resistor input

3.0–6.5V

SEG /PROG

SEG₄/PROG₄LED segment 4/

program 4 input

SEG /PROG

DISP

SEG₅/PROG₅LED segment 5/

program 5 input

16-Pin Narrow SOIC

V_CC

V_SS

PN201201.eps

SEG₆/PROG₆LED segment 6/

program 6 input

System ground

9/96 B

12 3 4 5 6 7...20

中文翻译

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