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DS1920
Temperature iButton®


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Status
Part Number Status
DS1920 Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet
FULL DATA SHEET (PDF, 496kB)
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Description
The DS1920 provides direct-to-digital 9-bit temperature readings over a range of -55°C to +100°C in 0.5° increments. The iButton communicates with a processor using the 1-Wire® protocol through a hardware port interface. The port interface provides both the physical link and handles the communication protocols that enable the processor to access iButton resources with simple commands. Two bytes of EEPROM can be used either to set alarm triggers or for storing user data.

Armored in an iButton, the thermometer can measure temperatures in demanding environments. Like every other iButton, the DS1920 has a unique serial number. The 1-Wire interface reduces data output, address, and power to one line. A unique serial number allows multiple 1920s to share the same bus, with many sensors placed at different sites reporting to a single port on a processor. Multidropped DS1920s make the lowest-power temperature sensing network available inside buildings, equipment, or machinery and in process monitoring and control. With appropriate accessories the DS1920 easily attaches to an object or circuit board.

Key Features
  • Digital Thermometer Measures Temperatures from -55°C to +100°C in Typically 0.2s
  • Zero Standby Power
  • 0.5°C Resolution, Digital Temperature Reading is Two's Complement of °C Value
  • Access to Internal Counters Allows Increased Resolution Through Interpolation
  • Reduces control, Address, Data, and Power to a Single Data Contact
  • 8-Bit Device-Generated CRC for Data Integrity
  • 8-Bit Family Code Specifies DS1920 Communications Requirements to Reader
  • Special Command Set Allows User to Skip ROM Section and Perform Temperature Measurements Simultaneously for All Devices on the Bus
  • 2 Bytes of EEPROM to Be Used Either as Alarm Triggers or User Memory
  • Alarm Search Directly Indicates Which Device Senses Alarming Temperatures

Diagram

Application Notes
  • Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS1920
  • Application Note 74: Reading and Writing 1-Wire® Devices Through Serial Interfaces - DS1920
  • Application Note 126: 1-Wire® Communication Through Software - DS1920
  • Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS1920
  • Application Note 155: 1-Wire® Software Resource Guide Device Description - DS1920
  • Application Note 158: 1-Wire® Tagging with XML - DS1920
  • Application Note 159: Software Methods to Achieve Robust 1-Wire® Communication in iButton® Applications - DS1920
  • Application Note 187: 1-Wire Search Algorithm - DS1920
  • Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS1920
  • Application Note 198: Networked Temperature Monitoring - DS1920
  • Application Note 244: Advanced 1-Wire Network Driver - DS1920
  • Application Note 937: Book of iButton® Standards - DS1920
  • Application Note 1097: White Paper 2: Using the 1-Wire® Public Domain Kit - DS1920
  • Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS1920
  • Application Note 2965: 1-Wire® Master Device Configuration - DS1920
  • Application Note 3620: Temperature-Based Fan Control Using the MAXQ2000 Microcontroller - DS1920
  • Application Note 3808: What Is an iButton? - DS1920
  • Application Note 4255: How to Power the Extended Features of 1-Wire® Devices - DS1920

    Reliability Reports
  • Request Reliability Report for:

    Software/Models
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    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: 1-2 of 2

    DS1920 Notes Free
    Sample
    Buy Status Recommended Replacement
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS1920-F5+    
    Active
    CAN-F5;2 pin;301 mm²
    Outline Drawing: 21-0266 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: IB+5NS*
    Special - See Data Sheet RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1920-F5   F5 MicroCan   N/A No Longer Available DS1920-F5+


    Land Pattern: Not Available

    Special - See Data Sheet See data sheet

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    Document Ref.: 19-4886; 2009-09-16
    This page last modified: 2009-09-16


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