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DS2741_09

Description
Current Monitor and Accumulator with Integrated Sense Resistor
File Size183KB,10 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

DS2741_09 Overview

Current Monitor and Accumulator with Integrated Sense Resistor

19-4683; Rev 1; 7/09
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 I
2
C 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.
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 I
2
C 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)
DS2741
Applications
Cell Phones
PDAs
Battery Monitor/Rechargers
Ordering Information
PART
DS2741N+
DS2741N+T
TEMP RANGE
-20°C to +70°C
-20°C to +70°C
PIN-PACKAGE
14 TDFN-EP*
14 TDFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP
= Exposed pad.
Typical Operating Circuit
TOP VIEW
Pin Configuration
RS- RS- RS- RS- SLP GND DNC
CHARGER/
LOAD
14
RS+
DS2741
13
12
11
10
9
8
RS-
DC-DC
CONVERTER
1.8V
Li +
BATTERY
V
CC
DS2741
EP*
2
3
4
5
6
7
SLP
0.1μF
GND
SDA
SCL
2.2kΩ
2.2kΩ
MICROPROCESSOR
1
RS+ RS+ RS+ RS+ SDA SCL V
CC
+
TDFN
*EXPOSED PAD
________________________________________________________________
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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