BQ2011 datasheet(1/20 Pages) TI

tên linh kiện	BQ2011

Giải thích chi tiết về linh kiện	Gas Gauge IC for High Discharge Rates

PDF	20 Pages

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nhà sản xuất	TI [Texas Instruments]

Trang chủ	http://www.ti.com

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Features

➤ Conservative and repeatable

measurement of available charge

in rechargeable batteries

➤ Designed for portable equipment

such as power tools with high dis-

charge rates

➤ Designed for battery pack inte-

gration

- 120µA typical standby current

(self-discharge estimation mode)

- Small size enables imple-

mentations in as little as 1

2

square inch of PCB

➤ Direct drive of LEDs for capacity

display

➤ Self-discharge compensation us-

ing internal temperature sensor

➤ Simple single-wire serial commu-

nications port for subassembly

testing

➤ 16-pin narrow SOIC

General Description

The bq2011 Gas Gauge IC is intended

for battery-pack installation to main-

tain an accurate record of available

battery charge. The IC monitors a

voltage drop across a sense resistor

connected in series between the nega-

tive battery terminal and ground to

determine charge and discharge ac-

tivity of the battery. The bq2011 is

designed for systems such as power

tools with very high discharge rates.

Battery self-discharge is estimated

based on an internal timer and tem-

perature sensor. Compensations for

battery temperature and rate of

charge or discharge are applied to

the c harge , disc harge , and

selfdischarge calculations to provide

available charge information across

a wide range of operating conditions.

Initial battery capacity is set using

the PFC and MODE pins.

Actual

battery capacity is automatically

“learned” in the course of a dis-

charge cycle from full to empty and

may be displayed depending on the

display mode.

Nominal available charge may be di-

rectly indicated using a five-seg-

ment LED display. These segments

are used to indicate graphically the

nominal available charge.

The bq2011 supports a simple single-

line bidirectional serial link to an exter-

nal processor (common ground). The

bq2011 outputs battery information in

response to external commands over the

serial link. To support subassembly

testing, the outputs may also be con-

trolled by command. The external proc-

essor may also overwrite some of the

bq2011 gas gauge data registers.

The bq2011 may operate directly

from four cells. With the REF output

and an external transistor, a simple,

inexpensive regulator can be built to

provide VCC from a greater number

of cells.

Internal registers include available

charge, temperature, capacity, battery

ID, and battery status.

1

Gas Gauge IC for

High Discharge Rates

2/96 E

Pin Connections

Pin Names

1

PN201101.eps

16-Pin Narrow SOIC

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

VCC

REF

NC

DQ

RBI

SB

DISP

SR

MODE

SEG1

SEG2

SEG3

SEG4

SEG5

PFC

VSS

MODE

Display mode output

SEG1

LED segment 1

SEG2

LED segment 2

SEG3

LED segment 3

SEG4

LED segment 4

SEG5

LED segment 5

PFC

Programmed full count

selection input

REF

Voltage reference output

NC

No connect

DQ

Serial communications

input/output

RBI

Register backup input

SB

Battery sense input

DISP

Display control input

SR

Sense resistor input

VCC

3.0–6.5V

VSS

Negative battery terminal

bq2011

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