DS2745U 查看數據表（PDF） - Maxim Integrated

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DS2745U

Low-Cost I2C Battery Monitor

Maxim Integrated 

19-4631; 5/09

www.maxim-ic.com

FEATURES

16-Bit Bidirectional Current Measurement

1.56V LSB, ±51.2mV Dynamic Range

104A LSB, ±3.4A Dynamic Range (RSNS =

15m)

Current Accumulation Register Resolution

6.25Vhr LSB, ±204.8mVh Range

0.417mAhr LSB, ±13.65Ah Range

(RSNS = 15m)

11-Bit Voltage Measurement

4.88mV LSB, 0V to 4.5V Input Range

11-Bit Temperature Measurement

0.125ºC Resolution, -20ºC to +70ºC

Industry Standard I2C* Interface

Low Power Consumption:

Active Current:

70A typical, 100A max

Sleep Current:

1A typical, 3A max

BLOCK DIAGRAM

DS2745

Low-Cost I2C Battery Monitor

PIN CONFIGURATION

SCL

SDA

PIO

SNS

1

8

2

7

3

6

4

5

MAX

VDD

VIN

CTG

VSS

See Table 1 for Ordering Information.

DESCRIPTION

The DS2745 provides current-flow, voltage, and

temperature measurement data to support battery-

capacity monitoring in cost-sensitive applications. The

DS2745 can be mounted on either the host side or

pack side of the application. Current measurement

and coulomb counting is accomplished by monitoring

the voltage drop across an external sense resistor,

voltage measurement is accomplished through a

separate voltage-sense input, and temperature

measurement takes place on-chip. A standard I2C

interface with software programmable address gives

the controlling microprocessor access to all data and

status registers inside the DS2745. A low-power sleep

mode state conserves energy when the cell pack is in

storage.

APPLICATIONS

Cellular

GPS

PDAs

Handheld Products

Table 1. ORDERING INFORMATION

PART

DS2745U+

DS2745U+T&R

MARKING

2745

2745

PIN-PACKAGE

MAX package

DS2745U+ in Tape-and-Reel

+Denotes lead(Pb)-free/RoHS-compliant package.

*I2C is a trademark of Philips Corp. Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated

Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system

conforms to the I2C Standard Specification as defined by Philips.

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