DS2741 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – Current Monitor and Accumulator with Integrated Sense Resistor

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
V_CC
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 V_CC
*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.