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Battery Monitor. DS2745 Datasheet

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Battery Monitor. DS2745 Datasheet






DS2745 Monitor. Datasheet pdf. Equivalent




DS2745 Monitor. Datasheet pdf. Equivalent





Part

DS2745

Description

Low-Cost I2C Battery Monitor



Feature


19-4631; 5/09 www.DataSheet4U.com DS274 5 Low-Cost I C Battery Monitor www.maxi m-ic.com 2 FEATURES 16-Bit Bidirection al Current Measurement 1.56V LSB, ± 51.2mV Dynamic Range 104A LSB, ±3.4 A Dynamic Range (RSNS = 15m) Current Accumulation Register Resolution 6.25 Vhr LSB, ±204.8mVh Range 0.417mAhr L SB, ±13.65Ah Range (RSNS = 15m) 11- Bit Voltage Measurement 4.88mV L.
Manufacture

Maxim Integrated Products

Datasheet
Download DS2745 Datasheet


Maxim Integrated Products DS2745

DS2745; SB, 0V to 4.5V Input Range 11-Bit Temper ature Measurement 0.125ºC Resolution, -20ºC to +70ºC Industry Standard I2C* Interface Low Power Consumption: Activ e Current: 70A typical, 100A max Sleep Current: 1A typical, 3A max PIN CONFIGURATION SCL SDA PIO SNS 1 2 3 4 8 7 6 5 VDD VIN CTG VSS MAX S ee Table 1 for Ordering Information. D ESCRIPTION The DS2745 provides .


Maxim Integrated Products DS2745

current-flow, voltage, and temperature m easurement data to support batterycapac ity monitoring in cost-sensitive applic ations. The DS2745 can be mounted on ei ther the host side or pack side of the application. Current measurement and co ulomb counting is accomplished by monit oring the voltage drop across an extern al sense resistor, voltage measurement is accomplished th.


Maxim Integrated Products DS2745

rough a separate voltage-sense input, an d temperature measurement takes place o n-chip. A standard I2C interface with s oftware programmable address gives the controlling microprocessor access to al l data and status registers inside the DS2745. A low-power sleep mode state co nserves energy when the cell pack is in storage. BLOCK DIAGRAM APPLICATIONS Cellular GPS PDAs .

Part

DS2745

Description

Low-Cost I2C Battery Monitor



Feature


19-4631; 5/09 www.DataSheet4U.com DS274 5 Low-Cost I C Battery Monitor www.maxi m-ic.com 2 FEATURES 16-Bit Bidirection al Current Measurement 1.56V LSB, ± 51.2mV Dynamic Range 104A LSB, ±3.4 A Dynamic Range (RSNS = 15m) Current Accumulation Register Resolution 6.25 Vhr LSB, ±204.8mVh Range 0.417mAhr L SB, ±13.65Ah Range (RSNS = 15m) 11- Bit Voltage Measurement 4.88mV L.
Manufacture

Maxim Integrated Products

Datasheet
Download DS2745 Datasheet




 DS2745
19-4631; 5/09
www.maxim-ic.com
FEATURES
16-Bit Bidirectional Current Measurement
1.56V LSB, ±51.2mV Dynamic Range
104A LSB, ±3.4A Dynamic Range (RSNS =
15m)
Current Accumulation Register Resolution
6.25Vhr 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:
70A typical, 100A max
Sleep Current:
1A typical, 3A max
BLOCK DIAGRAM
www.DataSheet4U.com
DS2745
Low-Cost I2C Battery Monitor
PIN CONFIGURATION
SCL
SDA
PIO
SNS
18
27
36
45
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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 DS2745
DS2745 Low-Cost I2C Battery Monitor
ABSOLUTE MAXIMUM RATINGS*
Voltage on All Pins Relative to VSS
Operating Temperature Range
Storage Temperature Range
Soldering Temperature
www.DataSheet4U.com
-0.3V to +6V
-40°C to +85°C
-55°C to +125°C
See IPC/JEDECJ-STD-020A
* This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation
sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
(2.5V VDD 4.5V; TA = 0C to +70C.)
PARAMETER SYMBOL
CONDITIONS
Supply Voltage
Serial Data I/O Pin
VDD
SDA
(Note 1)
(Note 1)
Serial Clock Pin
SCL
(Note 1)
Programmable I/O Pin
PIO (Note 1)
VIN Pin
VIN (Note 1)
MIN
+2.5
-0.3
-0.3
-0.3
-0.3
TYP
MAX
+4.5
+5.5
+5.5
+5.5
VDD +0.3
UNITS
V
V
V
V
V
DC ELECTRICAL CHARACTERISTICS
(2.5V VDD 4.5V; TA = 0C to +70C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
Active Current
Sleep-Mode Current
Current Resolution
Current Full-Scale
Magnitude
Current Offset
Current Gain Error
Accumulated Current
Resolution
Accumulated Current
Offset
Voltage Resolution
Voltage Full-Scale
Voltage Error
Temperature Resolution
Temperature Error
Current Sample Clock
Frequency
Timebase Accuracy
IACTIVE
ISLEEP
ILSB
IFS
IOERR
IGERR
qCA
qOERR
VLSB
VFS
VGERR
TLSB
TERR
fSAMP
tERR
VDD = 4.5V
SCL = SDA = VSS,
PIO = VSS
(Note 1)
(Note 2)
VSNS = VSS, (Notes 4, 5)
(Note 12)
VDD = 3.8V, TA = +25°C
-7.82
-1.0
-188
0
-25
-3
2 of 15
TYP
70
1
1.56
51.2
6.25
4.88
0.125
18.6
MAX
100
105
UNITS
A
3 A
+12.5
+1.0
+0
4.992
+25
+3
±1
V/R
mV/R
V/R
% of
reading
Vh/R
µVh/R
per day
mV
V
mV
°C
ºC
kHz
%




 DS2745
Input Resistance, VIN
Input Logic High:
SCL, SDA, PIO
Input Logic Low:
SCL, SDA, PIO
Output Logic Low:
SDA, PIO
Pulldown Current: SCL,
SDA, PIO
Input Capacitance: SCL,
SDA
SLEEP Timeout
RIN
VIH
VIL
VOL
IPD
CBUS
tSLEEP
-20°C TA +70°C,
2.5V VDD 4.5V
(Note 1)
(Note 1)
IOL = 4mA (Note 1)
(Note 3)
DS2745 Low-Cost I2C Battery Monitor
ww±w2.DataSheet4U.com
±3
15 M
1.5 V
0.6 V
0.4 V
0.25
A
50 pF
2.2 S
2-WIRE INTERFACE TIMING SPECIFICATIONS
(VDD = 2.5V to 4.5V, TA = -20C to +70C.)
PARAMETER
SYMBOL
CONDITIONS
SCL Clock Frequency
fSCL
(Note 6)
Bus Free Time Between a
STOP and START Condition
Hold Time (Repeated)
START Condition
tBUF
tHD:STA
(Note 7)
Low Period of SCL Clock
tLOW
High Period of SCL Clock
Setup Time for a Repeated
START Condition
Data Hold Time
tHIGH
tSU:STA
tHD:DAT
(Note 8, 9)
Data Setup Time
Rise Time of Both SDA and
SCL Signals
Fall Time of Both SDA and
SCL Signals
Setup Time for STOP
Condition
Spike Pulse Widths
Suppressed by Input Filter
Capacitive Load for Each
Bus
Line
SCL, SDA Input
Capacitance
tSU:DAT
tR
tF
tSU:STO
tSP
(Note 8)
(Note 10)
CB (Note 11)
CBIN
MIN TYP
0
1.3
0.6
1.3
0.6
0.6
0
100
20 + 0.1CB
20 + 0.1CB
0.6
0
MAX
400
0.9
300
300
50
UNITS
KHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
µs
ns
400 pF
60 pF
3 of 15






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