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REV: 042505
Note:
 Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device 
may be simultaneously available through various sales channels. For information about device errata, click here: 
www.maxim-ic.com/errata
.
GENERAL DESCRIPTION 
The DS2782 measures voltage, temperature and 
current, and estimates available capacity for 
rechargeable lithium ion and lithium-ion polymer 
batteries. 
Cell 
characteristics 
parameters used in the calculations are stored in on-
chip EEPROM. The available capacity registers 
report a conservative estimate of the amount of 
charge that can be removed given the current 
temperature, discharge rate, stored charge and 
application parameters. Capacity estimation reported 
in mAh remaining and percentage of full. 
APPLICATIONS 
Digital Still Cameras 
Sub-Notebook Computers 
Handheld PC Data Terminals 
3G Multimedia Wireless Handsets 
TYPICAL OPERATING CIRCUIT 
Pack+
and 
application 
FEATURES 
Precision Voltage, Temperature, and Current 
Measurement System  
Accurate Stable Internal Time Base 
Absolute and Relative Capacity Estimated from 
Coulomb Count, Discharge Rate, Temperature 
and Battery Cell Characteristics 
Accurate Warning of Low Battery Conditions 
Automatic Backup of Coulomb Count and Age 
Estimation to Nonvolatile (NV) EEPROM
Gain and Tempco Calibration Allows the Use of 
Low-Cost Sense Resistors 
24-Byte User EEPROM or 16-Byte User 
EEPROM and Unique 64-bit ID 
Industry 2-Wire Interface with Programmable 
Slave Address  
Tiny 8-Pin TSSOP Package Embeds Easily in 
Battery Packs Using Thin Prismatic Cells 
PIN CONFIGURATION 
SDA   5
SNS   7
4 
VDD
 2
 VSS
RSNS
Pack-
SDA
Protection
Circuit
DS2782
SCL   6
150
1 Cell
Li-Ion
Battery
0.1uF
1
NC
3 
VIN
500
1K
PIO    8
TSSOP-8
5.6V
SCL
150
5.6V
ORDERING INFORMATION 
PART 
DS2782E+ 
DS2782E+T&R 
Note:
 To order devices with the unique 64-bit ID option, contact Maxim/Dallas Semiconductor sales. 
MARKING 
2782+ 
2782+ 
PACKAGE INFORMATION 
Lead-Free TSSOP 
DS2782E+, Tape-and-Reel 
DS2782 
Stand-Alone Fuel Gauge IC
www.maxim-ic.com 
TOP VIEW 
1 
2 
3 
4 
5 
6 
7 
8 
NC
VSS
VIN
VDD
PIO 
SNS 
SCL 
SDA 
TSSOP-8