DS2781 Datasheet, PDF (1/30 Pages) Maxim Integrated Products – 1-Cell or 2-Cell Standalone Fuel Gauge IC

DS2781
1-Cell or 2-Cell
Standalone Fuel Gauge IC
GENERAL DESCRIPTION
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.
APPLICATIONS
Digital Video Cameras
Commercial Two-Way Radios
Industrial PDAs and Handheld PC Data Terminals
Portable GPS Navigation Systems
TYPICAL OPERATING CIRCUIT
P+
DS2781
DQ
DQ
VDD
PIO
VIN
OVD
VB
SNS
VSS
P-
Protection
Circuit
FEATURES
§ Precision Voltage, Temperature, and Current
Measurement System
§ Operates in One-Cell or Two--Cell Applications
§ Accurate, Temperature 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 Battery/Application Parameter EEPROM
§ 16-Byte User EEPROM
§ Unique ID and Multidrop 1-Wire^Ò Interface
§ Tiny 8-Pin TSSOP Package Embeds Easily in
Battery Packs Using Thin Prismatic Cells
PIN CONFIGURATION
TOP VIEW
TSSOP-8
VB 1
VSS ₂
VIN ₃
VPLS ₄
8 ^PIO
7 ^SNS
6 ^OVD
5 ^DQ
ORDERING INFORMATION
PART
MARKING
DS2781E+
DS2781E+T&R
2781
2781
PACKAGE
TSSOP
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