ENGLISH 简体中文 日本語 한국어  

    Login | Register 


   
 
Enter keywords or part number    



DS2745
Low-Cost I²C Battery Monitor

Low-cost battery fuel gauge that monitors current, voltage, and temperature


  QuickView     Technical Documents     Ordering Info     More Information     User Comments (0)     All  
Description
FULL DATA SHEET (PDF, 236kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail
The DS2745 provides current-flow, voltage, and temperature measurement data to support battery-capacity monitoring in cost-sensitive applications. The DS2745 can be mounted on either the host side or pack side of the application. Current measurement and coulomb counting is accomplished by monitoring the voltage drop across an external sense resistor, voltage measurement is accomplished through a separate voltage-sense input, and temperature measurement takes place on-chip. A standard I²C interface with software programmable address gives the controlling microprocessor access to all data and status registers inside the DS2745. A low-power sleep mode state conserves energy when the cell pack is in storage.

NOTE: This product requires use of the following:

  • DS2745K Evaluation Kit Software

    Key Features   Applications/Uses
    • 16-Bit Bidirectional Current Measurement
      • 1.56µV LSB, ±51.2mV Dynamic Range
      • 104µA LSB, ±3.4A Dynamic Range (RSNS = 15mΩ)
    • Current Accumulation Register Resolution
      • 6.25µVhr LSB, ±204.8mVh Range
      • 0.417mAhr LSB, ±13.65Ah Range (RSNS = 15mΩ)
    • 11-Bit Voltage Measurement
    • 4.88mV LSB, 0V to 5V Input Range
    • 11-Bit Temperature Measurement
    • 0.125°C Resolution, -20°C to +70°C
    • Industry Standard I²C Interface
    • Low Power Consumption:
      • Active Current: 70µA typical, 100µA max
      • Sleep Current: 1µA typical, 3µA max

     
  • Cellular
  • GPS
  • Handheld Products
  • PDAs

    Key Specifications:   Battery Protectors, Selectors and Monitors
    Part Number Functions Battery Type Interface Parameters Measured Supply Voltage (min) (V) Supply Voltage (max) (V) Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
    DS2745 
    Fuel Gauge
    1 Cell Li-Ion
    3-Cell NiMH
    2-Wire Current
    Temperature
    Voltage
    2.5 5.5 µMAX/8 16 -40 to +85 $1.48 @ 1k
    See All Battery Protectors, Selectors and Monitors (26)
    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.

    Diagram
    DS2745: Block Diagram
    Block Diagram

    Didn't Find What You Need?
  • Next Day Product Selection Assistance from Applications Engineers
  • Parametric Search
  • Applications Help
  •  QuickView   Technical Documents   Ordering Info   More Information  
     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

     Data Sheet 
     Application Notes 
     Design Guides 
     Engineering Journals 
     Reliability Reports 
     Software/Models 
     Evaluation Kits 

     Price and Availability 
     Samples 
     Buy Online 
     Package Information 
     Lead-Free Information 

     Related Products 
     Notes and Comments 
     Evaluation Kits 

    Document Ref.: 19-4631; 2009-06-22
    This page last modified: 2009-07-08


  •         •         •         •     Privacy Policy     •     Legal Notices

        Copyright © 2009 by Maxim Integrated Products