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DS1921H, DS1921Z
High Resolution Thermochron iButton Range H: +15°C to +46°C; Z: -5°C to +26°C


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Data Sheet
FULL DATA SHEET (PDF, 496kB)
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Description
The DS1921H/Z Thermochron® iButtons® are rugged, self-sufficient systems that measure temperature and record the result in a protected memory section. The recording is done at a user-defined rate, both as a direct storage of temperature values as well as in the form of a histogram. Up to 2048 temperature values taken at equidistant intervals ranging from 1 to 255 minutes can be stored. The histogram provides 64 data bins with a resolution of 0.5°C. If the temperature leaves a user-programmable range, the DS1921H/Z will also record when this happened, for how long the temperature stayed outside the permitted range, and if the temperature was too high or too low. Additional 512 bytes of read/write NV memory allow storing information pertaining to the object to which the DS1921H/Z is associated. Data is transferred serially via the 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1921H/Z is factory-lasered with a guaranteed unique electrically readable 64-bit registration number that allows for absolute traceability. The durable stainless steel package is highly resistant to environmental hazards such as dirt, moisture, and shock. Accessories permit the DS1921H/Z to be mounted on almost any object, including containers, pallets, and bags.

Key Features
  • Digital thermometer measures temperature 1/8°C increments with ±1°C accuracy
  • Built-in real-time clock (RTC) and timer has accuracy of ±2 minutes per month from 0°C to 45°C
  • Water resistant or waterproof if placed inside DS9107 iButton capsule (Exceeds Water Resistant 3 ATM requirements)
  • Automatically wakes up and measures temperature at user-programmable intervals from 1 to 255 minutes
  • Logs up to 2048 consecutive temperature measurements in protected nonvolatile (NV) random access memory
  • Records a long-term temperature histogram with 1/2°C resolution
  • Programmable temperature-high and temperature-low alarm trip points
  • Records up to 24 time stamps and durations when temperature leaves the range specified by the trip points
  • 512 bytes of general-purpose read/write NV random access memory
  • Communicates to host with a single digital signal at 15.4kbits or 125kbits per second using 1-Wire protocol
  • Fixed range: H: +15°C to +46°C; Z: -5°C to +26°C
Common iButton Features
  • Digital identification and information by momentary contact
  • Unique, factory-lasered and tested 64-bit reg-istration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures ab-solute traceability because no two parts are alike
  • Multidrop controller for 1-Wire net
  • Chip-based data carrier compactly stores information
  • Data can be accessed while affixed to object
  • Button shape is self-aligning with cup-shaped probes
  • Durable stainless steel case engraved with registration number withstands harsh environments
  • Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim
  • Presence detector acknowledges when reader first applies voltage
  • Designed to meet UL#913 (4th Edit.). Intrinsically Safe Apparatus: under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations, contact Dallas Semiconductor for certification schedule

Key Specifications:   iButton Products
Part Number Overview Memory Type Memory Size Data Logger Type Data Logger Size Data Logger Measurement Range Programmable Alarm UniqueWare Real-Time Clock RoHS Available Price**
DS1921H 
Temperature Sensor iButton
NV SRAM 4k bits Temperature 2048 Byte +15°C to +46°C Temperature High/Low No Yes Yes $14.25 @ 1k
DS1921Z  -5°C to +26°C $14.25 @ 1k
See All iButton Products (24)
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
DS1921H, DS1921Z: High Resolution Thermochron
High Resolution Thermochron

Application Notes
  • Application Note 155: 1-Wire® Software Resource Guide Device Description - DS1921H, DS1921Z
  • Application Note 244: Advanced 1-Wire Network Driver - DS1921H, DS1921Z
  • Application Note 1200: White Paper 7: Thermochron Mission Authentication and Security - DS1921H, DS1921Z
  • Application Note 3808: What Is an iButton? - DS1921H, DS1921Z
  • Application Note 3809: Exporting DS192x Logger Data from the OneWireViewer into Excel - DS1921H, DS1921Z
  • Application Note 3892: Overview of iButton Sensors and Temperature/Humidity Dataloggers - DS1921H, DS1921Z
  • Application Note 4126: Understanding the IP (Ingress Protection) Ratings of iButton Data Loggers and Capsule - DS1921H, DS1921Z

    Evaluation Kits
    none

    Design Guides
  • 1-Wire® PRODUCTS (PDF)

    Reliability Reports
  • Reliability Report: DS1921H.pdf
  • Request Reliability Report for:

    Software/Models
    none

    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

    DS1921H Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS1921H-F5#  
    CAN;2 pin;0 mm²
    Dwg: 56-G0CAN-F50A (PDF)
    Use pkgcode/variation: IB#5CP*
    Special - See Data Sheet RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1921Z Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS1921Z-F5#  
    CAN;2 pin;0 mm²
    Dwg: 56-G0CAN-F50A (PDF)
    Use pkgcode/variation: IB#5CP*
    Special - See Data Sheet RoHS/Lead-Free: RoHS Qualified
    Materials Analysis

    More Information
  • New Product Press Release 2002-02-04 
  • Evaluation Kit: DS1921K

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    2007-12-05
    This page last modified: 2008-03-11



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