DS2781
1-Cell or 2-Cell Stand-Alone Fuel Gauge IC
Complete Fuel Gauge IC for Accurate Remaining Battery Capacity Readings for 1- or 2-Cell Applications
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Key Features
Applications/Uses
| Functions | Fuel Gauge |
| Battery Type | 1-2 Cell Li-Ion |
| Fuel Gauge Algorithm | FuelPack |
| Interface | 1-Wire |
| User Data Storage (Bytes) | 40 EEPROM |
| Parameters Measured | Current Temperature Voltage |
| End Equipment | Pack |
| VSUPPLY (V) (min) | 2.5 |
| VSUPPLY (V) (max) | 10 |
| Package/Pins | TDFN/10 TSSOP/8 |
| Oper. Temp. (°C) | -40 to +85 |
| Budgetary Price (See Notes) | 4.1 |
Simplified Block Diagram
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
Parameters
| Functions | Fuel Gauge |
| Battery Type | 1-2 Cell Li-Ion |
| Fuel Gauge Algorithm | FuelPack |
| Interface | 1-Wire |
| User Data Storage (Bytes) | 40 EEPROM |
| Parameters Measured | Current Temperature Voltage |
| End Equipment | Pack |
| VSUPPLY (V) (min) | 2.5 |
| VSUPPLY (V) (max) | 10 |
| Package/Pins | TDFN/10 TSSOP/8 |
| Oper. Temp. (°C) | -40 to +85 |
| Budgetary Price (See Notes) | 4.1 |
Key Features
- 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
Applications/Uses
- Commercial Two-Way Radios
- Digital Video Cameras
- Industrial PDAs and Handheld PC Data Terminals
- Portable GPS Navigation Systems
Description
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.Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
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