1-Cell or 2-Cell Stand-Alone Fuel Gauge IC

The DS2781 remains in production, however, for new projects, we recommend ModelGauge m5 MAX17215 fuel gauge.

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

* Commercial Two-Way Radios * Digital Video Cameras * Industrial PDAs and Handheld PC Data Terminals * Portable GPS Navigation Systems

* Precision Voltage, Temperature, and Current Measurement System

* Operates in One-Cell or Two--Cell Applications

* Accurate, Temperature Stable Internal Timebase

* 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 Temperature Coefficient Calibration Allows the Use of Low-Cost Sense Resistors

* 24-Byte Parameter EEPROM

* 16-Byte User EEPROM

* Unique ID and Multidrop 1-Wire® Interface

* Tiny 8-Pin TSSOP and 10-Pin TDFN (3mm x 4mm) Packages Embed Easily in Thin Prismatic Cell Packs