DS2781
1-Cell or 2-Cell
Standalone Fuel Gauge IC
GENERAL DESCRIPTION
FEATURES
The DS2781 measures voltage, temperature, and
current, and estimates available capacity for
rechargeable Lithium-Ion and Lithium-Ion Polymer
batteries. Cell stack characteristics and application
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 is
reported in milliamp hours remaining and percentage
of full.
Cꢀ Precision Voltage, Temperature, and Current
Measurement System
Cꢀ Operates in One-Cell or Two--Cell Applications
Cꢀ Accurate, Temperature Stable Internal Time
Base
Cꢀ Absolute and Relative Capacity Estimated from
Coulomb Count, Discharge Rate, Temperature,
and Battery Cell Characteristics
Cꢀ Accurate Warning of Low Battery Conditions
Cꢀ Automatic Backup of Coulomb Count and Age
Estimation to Nonvolatile (NV) EEPROM
Cꢀ Gain and Tempco Calibration Allows the Use of
Low-Cost Sense Resistors
APPLICATIONS
Digital Video Cameras
Cꢀ 24-Byte Battery/Application Parameter EEPROM
Cꢀ 16-Byte User EEPROM
Commercial Two-Way Radios
Industrial PDAs and Handheld PC Data Terminals
Portable GPS Navigation Systems
ꢀ
Cꢀ Unique ID and Multidrop 1-Wire Interface
Cꢀ Tiny 8-Pin TSSOP Package Embeds Easily in
Battery Packs Using Thin Prismatic Cells
TYPICAL OPERATING CIRCUIT
PIN CONFIGURATION
TOP VIEW
TSSOP-8
P+
DS2781
PIO
VB
1
2
3
4
8
7
DQ
DQ
VDD
VIN
VB
SNS
VSS
PIO
OVD
SNS
OVD
DQ
VIN
6
5
VSS
VPLS
Protection
Circuit
P-
ORDERING INFORMATION
PART
MARKING
PACKAGE
DS2781E+
2781
TSSOP
DS2781E+T&R
2781
Tape-and-Reel
+ Denotes lead-free package.
1-Wire is a registered trademark of Dallas Semiconductor.
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.
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REV: 010906