DS2741N(2008) 查看數據表（PDF） - Maxim Integrated

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DS2741N
(Rev.:2008)

Current Monitor and Accumulator with Integrated Sense Resistor

Maxim Integrated 

Rev 0; 8/08

Current Monitor and Accumulator with

Integrated Sense Resistor

General Description

The DS2741 current monitor/accumulator is a complete

current-sensing, measuring, and accumulation device

tailored for cost-sensitive, battery-powered applications

in a small 3mm x 3mm TDFN package. As a result, the

DS2741 is a key component in battery-charge control

and remaining capacity-estimation applications.

Through its I2C interface, the DS2741 gives the host

system access to current measurement and accumula-

tion registers. The 7-bit slave address is factory pro-

grammable, allowing up to 128 devices to be individually

addressed by the host system.

Applications

Cell Phones

PDAs

Battery Monitor/Rechargers

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

DS2741N+

-20°C to +70°C

14 TDFN-EP*

DS2741N+T

-20°C to +70°C

14 TDFN-EP*

+Denotes a lead-free/RoHS-compliant package.

T = Tape and reel.

*EP = Exposed pad.

Typical Operating Circuit

Features

♦ Complete, Low-Cost, Integrated Current-Sensing

and Accumulation Solution with Serial Digital

Output

♦ On-Board 38mΩ Sense Resistor

♦ Current Measurement:

Signed 10-Bit Bidirectional Measurement

±2.5A Dynamic Range

1% Error at +25°C

2% Error Over Temperature

♦ Current Accumulation:

0.247mAhr LSB

±8.1Ahrs Full-Scale Range

♦ Industry-Standard I2C Interface with Factory-

Programmable Slave Address

♦ 2.5V to 4.5V Single-Supply Operation

♦ Low-Power Consumption:

Active Current: 60µA (typ)

Sleep Current: 1µA (typ)

♦ -20°C to +70°C Operating Range

♦ 14-Pin TDFN (3mm x 3mm x 0.8mm)

Pin Configuration

CHARGER/

LOAD

0.1μF

RS+

RS-

DS2741

VCC

SLP

SDA

GND

SCL

DC-DC

CONVERTER

1.8V

Li +

BATTERY

2.2kΩ 2.2kΩ

MICROPROCESSOR

TOP VIEW

RS- RS- RS- RS- SLP GND DNC

14 13 12 11 10 9 8

DS2741

EP*

12 3 4 5 6 7

RS+ RS+ RS+ RS+ SDA SCL VCC

*EXPOSED PAD

TDFN

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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