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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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Status
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.
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Data Sheet
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An evaluation kit is available: DS2781EVKIT NOTE: This product uses the following:DS2781K Evaluation Kit Software
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
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Applications/Uses
- Commercial Two-Way Radios
- Digital Video Cameras
- Industrial PDAs and Handheld PC Data Terminals
- Portable GPS Navigation Systems
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Key Specifications:
| Battery Protectors, Selectors and Monitors |
| Part Number |
Functions |
Battery Type |
Interface |
User Data Storage
(Bytes) |
Parameters Measured |
VSUPPLY
(V) |
VSUPPLY
(V) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Oper. Temp.
(°C) |
Budgetary Price |
| min |
max |
max w/pins |
See Notes |
| DS2781 |
Fuel Gauge |
1-2 Cell Li-Ion |
1-Wire |
40 EEPROM |
| Current | | Temperature | | Voltage |
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2.5 |
10 |
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11.3 |
-40 to +85 |
$2.90 @1k |
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See All Battery Protectors, Selectors and Monitors (29)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
Notes and Comments
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.
More Information
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Information Index
Rev 6;
2008-07-03
This page last modified: 2009-10-14
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