Rainbow Electronics DS2741 - Manual

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.
Applications
Cell Phones
PDAs
Battery Monitor/Rechargers
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
Current Monitor and Accumulator with
Integrated Sense Resistor
________________________________________________________________ Maxim Integrated Products 1
DS2741
TDFN
TOP VIEW
EP*
*EXPOSED PAD
2 4 5
13 11 10
RS- RS- SLP
RS+ RS+ SDA
1
14
RS-
RS+
3
12
RS-
RS+
6
9
GND
SCL
7
8
DNC
V CC
+
Pin Configuration
Ordering Information
DS2741
2.2k Ω
1.8V
2.2k Ω
0.1 μF
RS+
GND
SLP
V CC
RS-
SDA
SCL
DC-DC
CONVERTER
Li +
BATTERY
MICROPROCESSOR
CHARGER/
LOAD
Typical Operating Circuit
Rev 0; 8/08
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.
+ Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
*
EP = Exposed pad.
PART TEMP RANGE PIN-PACKAGE
DS2741N+ -20°C to +70°C 14 TDFN-EP*
DS2741N+T -20°C to +70°C 14 TDFN-EP*