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
Status
Part Number
Status
DS2781
Active: In Production. But some versions of the family are No Longer Available. See Ordering Information .
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.
An evaluation kit is available:
DS2781EVKIT
NOTE: This product requires use of the following:
DS2781K Evaluation Kit Software
Key Features
Applications/Uses
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
Commercial Two-Way Radios Digital Video Cameras Industrial PDAs and Handheld PC Data Terminals Portable GPS Navigation Systems
Key Specifications: Battery Protectors, Selectors and Monitors
Part Number
Functions
Battery Type
Interface
User Data Storage
Parameters Measured
VSUPPLY
VSUPPLY
Package/Pins
Smallest Available Pckg.2 )
Oper. Temp.
Price
min
max
max w/pins
See Notes
DS2781 Fuel Gauge
1-2 Cell Li-Ion
1-Wire
40 EEPROM
Current Temperature Voltage
2.5
10
11
-40 to +85
$2.90 @1k
See All Battery Protectors, Selectors and Monitors (25)
Diagram
Typical Operating Circuit
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2008-07-03
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