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Multichemistry Battery Fuel Gauge

Multichemistry battery fuel gauge tailored for cost-sensitive and space-constrained 1-cell Li+/polymer or 3-cell Ni battery-pack applications

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet Feb 02, 2005

Support & Training

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Sampling:
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Key Features

  • Available in Two Configurations
    • Internal 25mΩ Sense Resistor
    • External User-Selectable Sense Resistor. Current Measurement
    • 12-Bit Bidirectional Measurement
    • Internal Sense Resistor Configuration: 0.625mA LSB and ±1.9A Dynamic Range
    • External Sense Resistor Configuration: 15.625µV LSB and ±64mV Dynamic Range
  • Current Accumulation
    • Internal Sense Resistor: 0.25mAhr LSB
    • External Sense Resistor: 6.25µVhr LSB
  • Voltage Measurement with 4.88mV Resolution
  • Temperature Measurement Using Integrated Sensor with 0.125°C Resolution
  • 32 Bytes of Lockable EEPROM
  • 16 Bytes of General-Purpose SRAM
  • Dallas 1-Wire Interface with Unique 64-Bit Device Address
  • Supports 1-Cell Li+/Polymer or 3-Cell Ni Battery Packs
  • 3mm Dimension of 8-Pin TSSOP Package Allows Mounting on Side of Thin Li+ and Li+/Polymer Cells
  • Low Power Consumption:
    • Active Current: 60µA (typ), 90µA (max)
    • Sleep Current: 1µA (typ), 2µA (max)

Applications/Uses

  • Cell Phones
  • Digital Cameras
  • PDAs
  • Portable Consumer Products

Description

The DS2751 multichemistry battery fuel gauge is a data-acquisition and information-storage device tailored for cost-sensitive and space-constrained 1-cell Li+/polymer or 3-cell Ni battery-pack applications. The DS2751 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 DS2751 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.

The DS2751 performs temperature, voltage, and current measurement to a resolution sufficient to support process-monitoring applications such as battery charge control and remaining capacity estimation. Temperature is measured using an on-chip sensor, eliminating the need for a separate thermistor. Bidirectional current measurement and accumulation are accomplished using either an internal 25mΩ sense resistor or an external device. The DS2751 also features a programmable I/O pin that allows the host system to sense and control other electronics in the pack, including switches, vibration motors, speakers, and LEDs.

Three types of memory are provided on the DS2751 for battery information storage: EEPROM, lockable EEPROM, and SRAM. EEPROM memory saves important battery data in true NV memory that is unaffected by severe battery depletion, accidental shorts, or ESD events. Lockable EEPROM becomes ROM when locked to provide additional security for unchanging battery data. SRAM provides inexpensive storage for temporary data.

Simplified Block Diagram

Technical Docs

Data Sheet Feb 02, 2005

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our 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.