DatasheetsPDF.com

and Accumulator. DS2741 Datasheet

DatasheetsPDF.com

and Accumulator. DS2741 Datasheet






DS2741 Accumulator. Datasheet pdf. Equivalent




DS2741 Accumulator. Datasheet pdf. Equivalent





Part

DS2741

Description

Current Monitor and Accumulator



Feature


19-4683; Rev 1; 7/09 www.DataSheet4U.co m Current Monitor and Accumulator with Integrated Sense Resistor General Desc ription The DS2741 current monitor/accu mulator is a complete current-sensing, measuring, and accumulation device tail ored for cost-sensitive, battery-powere d applications in a small 3mm x 3mm TDF N package. As a result, the DS2741 is a key component in .
Manufacture

Maxim Integrated Products

Datasheet
Download DS2741 Datasheet


Maxim Integrated Products DS2741

DS2741; battery-charge control and remaining cap acity-estimation applications. Through its I2C interface, the DS2741 gives the host system access to current measurem ent and accumulation registers. The 7-b it slave address is factory programmabl e, allowing up to 128 devices to be ind ividually addressed by the host system. Features ♦ Complete, Low-Cost, Inte grated Current-Sensi.


Maxim Integrated Products DS2741

ng and Accumulation Solution with Serial Digital Output ♦ On-Board 38mΩ Sens e Resistor ♦ Current Measurement: Sig ned 10-Bit Bidirectional Measurement ± 2.5A Dynamic Range 1% Error at +25°C 2 % Error Over Temperature ♦ Current Ac cumulation: 0.247mAhr LSB ±8.1Ahrs Ful l-Scale Range ♦ Industry-Standard I2C Interface with FactoryProgrammable Sla ve Address ♦ 2.5V to 4.5V Sing.


Maxim Integrated Products DS2741

le-Supply Operation ♦ Low-Power Consum ption: Active Current: 60µA (typ) Slee p Current: 1µA (typ) ♦ -20°C to +70 °C Operating Range ♦ 14-Pin TDFN (3m m x 3mm x 0.8mm) DS2741 Applications Cell Phones PDAs Battery Monitor/Rechar gers Ordering Information PART DS2741N + DS2741N+T TEMP RANGE -20°C to +70°C -20°C to +70°C PIN-PACKAGE 14 TDFN-E P* 14 TDFN-EP* +Denotes a lead(.

Part

DS2741

Description

Current Monitor and Accumulator



Feature


19-4683; Rev 1; 7/09 www.DataSheet4U.co m Current Monitor and Accumulator with Integrated Sense Resistor General Desc ription The DS2741 current monitor/accu mulator is a complete current-sensing, measuring, and accumulation device tail ored for cost-sensitive, battery-powere d applications in a small 3mm x 3mm TDF N package. As a result, the DS2741 is a key component in .
Manufacture

Maxim Integrated Products

Datasheet
Download DS2741 Datasheet




 DS2741
19-4683; Rev 1; 7/09
www.DataSheet4U.com
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(Pb)-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.




 DS2741
www.DataSheet4U.com
Current Monitor and Accumulator with
Integrated Sense Resistor
ABSOLUTE MAXIMUM RATINGS
Voltage Range on VCC Relative to GND ...............-0.5V to +6.0V
Voltage Range on SDA, SCL,
RS+, RS-, SLP Relative to GND.....-0.5V to (VCC + 0.5V), not to
exceed +6.0V
Continuous Internal Sense Resistor Current ......................±2.7A
Pulsed Internal Sense Resistor
Current ..................................±10A for <100µs/s, <1000 pulses
Operating Temperature Range ...........................-20°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
(TA = -20°C to +70°C.)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage
Input Logic-High: SCL, SDA
Input Logic-Low: SCL, SDA
VCC (Note 1)
VIH
VIL
Input Logic-High: SLP
VIH
Input Logic-Low: SLP
Power-Up Ramp Time from
0V to VCCMIN
VIL
tRAMP
MIN
2.5
1.5
0.7 x
VCC
TYP
MAX
4.5
0.4
UNITS
V
V
V
V
0.3 x
VCC
25
V
ms
DC ELECTRICAL CHARACTERISTICS
(2.5V VCC 4.5V, TA = -20°C to +70°C.)
PARAMETER
SYMBOL
CONDITIONS
Active Current
Sleep-Mode Current
Output Logic-Low: SDA
IACTIVE
ISLEEP
VOL
SLP = SCL = SDA = VCC
SLP = 0V
IOL = 4mA (Note 1)
Internal Current-Sense Resistor
Value
RSNS +25°C
Current Resolution
ILSB
Current Full-Scale Magnitude
IFS (Note 2)
Current-Sense Accuracy at +25°C ATL ISENSE at 1.5A
Current-Sense Accuracy from
0°C to +70°C
ATL ISENSE at 1.5A
Current Sampling Rate
Accumulator Resolution
Internal Time-Base Accuracy
Current-Sense Offset
tCSR
qCA
tERR1
tERR2
(Note 3)
(Note 4)
(Note 4)
Measured with RS+ and RS- shorted
MIN
0.4
2.54
-20
TYP
60
1
38
2.64
2.7
±1
±2
200
0.247
±1
MAX
90
2
UNITS
μA
μA
V
45 m
mA
A
±3 %
±5 %
μs
mAh
±3
%
±6.5
+20 mA
2 _______________________________________________________________________________________




 DS2741
www.DataSheet4U.com
Current Monitor and Accumulator with
Integrated Sense Resistor
TEMPERATURE SENSOR CHARACTERISTICS
(VCC = +2.5V to +4.5V, TA = -20°C to +70°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Temperature Error
MIN TYP MAX UNITS
±5 °C
AC ELECTRICAL CHARACTERISTICS: I2C INTERFACE
(2.5V VCC 4.5V, TA = -20°C to +70°C, timing referenced to VIL(MAX) and VIH(MIN). See Figure 4.)
PARAMETER
SCL Clock Frequency
Bus Free Time Between STOP
and START Conditions
SYMBOL
fSCL
(Note 5)
tBUF
CONDITIONS
MIN TYP MAX UNITS
0 400 kHz
1.3 μs
Hold Time (Repeated) START
Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
START Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
STOP Setup Time
SDA and SCL Capacitive
Loading
tHD:STA
tLOW
tHIGH
tHD:DAT
tSU:DAT
tSU:STA
tR (Note 6)
tF
tSU:STO
CB
(Note 6)
(Note 6)
0.6
1.3
0.6
0
100
0.6
20 +
0.1CB
20 +
0.1CB
0.6
μs
μs
μs
0.9 μs
ns
μs
300 ns
300 ns
μs
400 pF
Note 1: All voltages are referenced to GND. Currents entering the IC are specified positive and currents exiting the IC are negative.
Note 2: Compensation of the internal sense resistor value for initial tolerance and temperature coefficient of -20°C to +70°C can
reduce the maximum reportable magnitude to 2.5A.
Note 3: Current sampling ceases for 2.5ms every 144ms to allow the ADC to measure temperature.
Note 4: Typical value for tERR1 is specified at 3.6V and +25°C, max value is specified for 0°C to +50°C. Max value for tERR2 is
specified for -20°C to +70°C.
Note 5: Interface timing shown is for fast-mode (400kHz) operation. This device is also backward compatible with standard-mode
I2C timing.
Note 6: CB—Total capacitance of one bus line in pF; timing referenced to 0.1 x VCC and 0.9 x VCC.
_______________________________________________________________________________________ 3






Recommended third-party DS2741 Datasheet






@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)