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Maxim > Products > [Power and Battery Management] 
DS2438
Smart Battery Monitor


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Status
Part Number Status
DS2438 Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet
FULL DATA SHEET (PDF, 376kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The DS2438 smart battery monitor provides several functions that are desirable to carry in a battery pack: a means of tagging a battery pack with a unique serial number, a direct-to-digital temperature sensor which eliminates the need for thermistors in the battery pack, an A/D converter which measures the battery voltage and current, an integrated current accumulator which keeps a running total of all current going into and out of the battery, an elapsed time meter, and 40 bytes of nonvolatile EEPROM memory for storage of important parameters such as battery chemistry, battery capacity, charging methodology and assembly date. Information is sent to/from the DS2438 over a 1-Wire® interface, so that only one wire (and ground) needs to be connected from a central microprocessor to a DS2438. This means that battery packs need only have three output connectors: battery power, ground, and the 1-Wire interface.

Because each DS2438 contains a unique silicon serial number, multiple DS2438s can exist on the same 1-Wire bus. This allows multiple battery packs to be charged or used in the system simultaneously.

Applications for the smart battery monitor include portable computers, portable/cellular telephones, and handheld instrumentation battery packs in which it is critical to monitor real-time battery performance. Used in conjunction with a microcontroller in the host system, the DS2438 provides a complete smart battery pack solution that is fully chemistry-independent. The customization for a particular battery chemistry and capacity is realized in the code programmed into the microcontroller and DS2438 EEPROM, and only a software revision is necessary should a designer wish to change battery pack chemistry.

An evaluation kit is available:  DS2438EVKIT  

NOTE: This product requires use of the following:

  • DS2438K Evaluation Kit Software

    Key Features   Applications/Uses
    • Unique 1-Wire interface requires only one port pin for communication
    • Provides unique 64-bit serial number to battery packs
    • Eliminates thermistors by sensing battery temperature on-chip
    • On-board A/D converter allows monitoring of battery voltage for end-of-charge and end-of-discharge determination
    • On-board integrated current accumulator facilitates fuel gauging
    • Elapsed time meter in binary format
    • 40-byte nonvolatile user memory available for storage of battery-specific data
    • Operating range -40°C to +85°C

    		 
  		• Cell Phones
  		• Digital Still Cameras
  		• Digital Video Cameras
  		• Palmtops, Handy Terminals (incl. barcode)
  		• Pen Entry Palmtops, PDAs and Organizers
  		• Smart Battery Packs/Chargers

    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
    DS2438  Status Monitor
    1-2 Cell Li-Ion
    2-6 Cell NiMH
    		 1-Wire 40 EEPROM
    Current
    Temperature
    Time
    Voltage
    		 2.4 10
    SOIC(N)/8
    		 31 -40 to +85 $2.51 @1k
    See All Battery Protectors, Selectors and Monitors (25)

    Diagram
    DS2438: Block Diagram
    Block Diagram

    Application Notes
  		• Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS2438
  		• Application Note 123: Recommended ESD Protection and Circuit Placement for the DS2438 in Li-Ion Cell Pack Master - DS2438
  		• Application Note 125: Using Dallas Battery Management ICs with High Voltage Battery Packs - DS2438
  		• Application Note 126: 1-Wire® Communication Through Software - DS2438
  		• Application Note 131: Lithium-Ion Cell Fuel Gauging with Maxim Battery Monitor ICs - DS2438
  		• Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS2438
  		• Application Note 158: 1-Wire® Tagging with XML - DS2438
  		• Application Note 187: 1-Wire Search Algorithm - DS2438
  		• Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS2438
  		• Application Note 214: Using a UART to Implement a 1-Wire Bus Master - DS2438
  		• Application Note 1097: White Paper 2: Using the 1-Wire® Public Domain Kit - DS2438
  		• Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS2438

    Evaluation Kits
  		• DS2438EVKIT

    Design Guides
  		• Battery Management (PDF)
  		• 1-Wire® Products (PDF)

    Reliability Reports
  		• Reliability Report: DS2438.pdf

    Software/Models
  		• DS2438K Evaluation Kit Software

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-8 of 8

    DS2438 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS2438Z-C02     N/A No Longer Available

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    DS2438Z  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-5*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS2438Z/T&R    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-5*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS2438Z+T&R    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2438Z+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2438AZ    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-5*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS2438AZ+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2438AZ+T&R    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2001-05-04 

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     Description 
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     Applications/Uses 
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    2005-07-12
    This page last modified: 2009-10-15


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