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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Active: In Production.

Description

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.

Data Sheet

Download this datasheet in PDF formatDownload Rev 3 (PDF, 368kB)
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An evaluation board is available: DS2756EVKIT

NOTE: This product uses 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 Monitors, Protectors, and Selectors
Part Number Functions Battery Type Interface User Data Storage
(Bytes)
Parameters Measured VSUPPLY
(V)
VSUPPLY
(V)
Features Oper. Temp.
(°C)
Budgetary
Price
min max See Notes
DS2756  Fuel Gauge
1 Cell Li-Ion
3-Cell NiMH
1-Wire
8 SRAM
96 EEPROM
Current
Temperature
Voltage
3 5.5
AFE
Digital Current Accumulation
One-Shot Mode
Suspend Mode
Unique ID
-40 to +85 $2.05 @1k
See All Battery Monitors, Protectors, and Selectors (34)

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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.



Diagram

DS2756: Typical Operating Circuit
Typical Operating Circuit

More Information

New Product Press Release   2006-06-01 ]

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Information Index

Document Ref.: 19-4633 Rev 3; 2009-06-22
This page last modified: 2009-06-22