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DS2756
High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode

Provides Key Hardware Components Required to Accurately Estimate Remaining Capacity by Integrating Low-Power Precision Measurements of Temperature, Voltage, Current, Current Accumulation, and Nonvolatile Data Storage


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 368kB)
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The DS2756 high-precision battery fuel gauge is a data-acquisition and information-storage device tailored for cost-sensitive and space-constrained 1-cell Li+/polymer battery-pack applications. The DS2756 provides the key hardware components required to accurately estimate remaining capacity by integrating low-power, precision measurements of temperature, voltage, current, and current accumulation, as well as nonvolatile (NV) data storage, into the small footprint of a 3.0mm x 4.4mm 8-pin TSSOP package.

Through its 1-Wire® interface, the DS2756 gives the host system read/write access to status and control registers, instrumentation registers, and general-purpose data storage. Each device has a unique factory-programmed 64-bit net address that allows it to be individually addressed by the host system, supporting multibattery operation.

An evaluation kit is available:  DS2756EVKIT  

NOTE: This product requires use of the following:

  • DS2756K Evaluation Kit Software

    Key Features
    • Programmable Suspend Mode
    • Accurate Current Accumulation
      • 2% ±4µV over ±64mV Input Range
      • 2% ±200µA over ±3.2A with 20mΩ Sense
    • Current Measurement
      • 9-Bit Snapshot Measurement
      • 12-Bit Average Updated Every 88ms
      • 15-Bit Average Updated Every 2.8s
    • Voltage Measurement
      • 9-Bit Snapshot Measurement
      • 10-Bit Average Updated Every 4ms
    • Temperature Measurement
      • 10-Bit with 0.125°C Resolution
    • Snapshot mode allows instantaneous power measurement
    • Host Alerted When Accumulated Current or Temperature Exceeds Programmable Limits
    • 96 Bytes of Lockable EEPROM
    • 8 Bytes of General-Purpose SRAM
    • Dallas 1-Wire Interface with Unique 64-Bit Address and Standard or Overdrive Timing
    • 3mm Dimension of 8-Pin TSSOP Package Allows Mounting on Side of Thin Prismatic Li+ and Li+/Polymer Cells

    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)
    Price
    min max max w/pins See Notes
    DS2756  Fuel Gauge
    1 Cell Li-Ion
    3-Cell NiMH
    1-Wire
    8 SRAM
    96 EEPROM
    Current
    Temperature
    Voltage
    3 5.5
    TSSOP/8
    20 -40 to +85 $1.90 @1k
    See All Battery Protectors, Selectors and Monitors (25)

    Diagram
    DS2756: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-4633; 2009-06-22
    This page last modified: 2009-06-22


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