DS1921G

Thermochron iButton Device


Description

The Thermochron® iButton® device (DS1921G) is a rugged, self-sufficient system that measures temperature and records 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 255min can be stored. The histogram provides 63 data bins with a resolution of 2.0°C. If the temperature leaves a user-programmable range, the DS1921G also records when this happened, for how long the temperature stayed outside the permitted range, and if the temperature was too high or too low. An additional 512 bytes of battery-backed SRAM allow storing information pertaining to the object to which the DS1921G is associated. Data is transferred serially through the 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1921G 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 DS1921G to be mounted on almost any object including containers, pallets, and bags.
DS1921G: Block Diagram DS1921G: Block Diagram Enlarge+

Key Features

  • High Accuracy, Full-Featured Digital Temperature Logger Simplifies Temperature Data Collection and Dissemination of Electronic Temperature Record
    • Accuracy ±1°C from -30°C to +70°C (See the Electrical Characteristics for Accuracy Specification)
    • Digital Thermometer Measures Temperature in 0.5°C Increments
    • Built-In Real-Time Clock (RTC) and Timer Has Accuracy of ±2 Minutes per Month from 0°C to +45°C
    • Automatically Wakes Up and Measures Temperature at User-Programmable Intervals from 1 Minute to 255 Minutes
    • Logs Consecutive Temperature Measurements in 2kB of Datalog Memory
    • Records a Long-Term Temperature Histogram with 2.0°C Resolution
    • Programmable Temperature High and Temperature Low Alarm Trip Points
    • Records Up to 24 Timestamps and Durations When Temperature Leaves the Range Specified by the Trip Points
    • Individually Calibrated in a NIST-Traceable Chamber
    • Complies to Standard EN12830
    • 512 Bytes of General-Purpose Battery-Backed SRAM
  • Rugged Construction Survives Harsh Environments
    • Water Resistant Enclosure (IP56) or Waterproof if Placed Inside DS9107 iButton Capsule (Exceeds Water Resistant 3 ATM Requirements)
    • CE, FCC, and UL913 Certifications
  • Simple Serial Port Interfaces to Most Microcontrollers for Rapid Data Transfer
    • Communicates to Host with a Single Digital Signal Up to 15.4kbps at Standard Speed or Up to 125kbps in Overdrive Mode Using 1-Wire Protocol

Applications/Uses

  • Temperature Logging in Cold Chain, Food Safety, Pharmaceutical, and Medical Products
Part Number Interface Technology Applications Usage Memory Type Memory Size Data Logger Type Temp. Readings Oper. Temp.
(°C)
Budgetary
Price
See Notes
DS1921G  1-Wire iButton Asset Management Multi Use NV SRAM 512 Bytes Temperature 2048 -40 to +85 $20.03 @1k
See All Data Loggers (10)
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.


DS1921K: Thermochron iButton Starter Kit

Technical Documents

App Note 5917 Instructions for Compiling the OneWireViewer for Linux
App Note 5916 iButton Mission Data Recovery: memlog User Guide
App Note 5705 Interface 1-Wire USB Adapter with Android
App Note 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
Tutorial 5405 Choosing the Logger iButton That's Right for You
App Note 5335 Determining the Mission Parameters for Temperature Logger iButton® Devices
App Note 5057 OneWireViewer Tips and Tricks
App Note 4506 Alternatives to the DS1994L 4Kb Plus Time Memory iButton®
Reference Schematic 4477 Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note 4126 Understanding the IP (Ingress Protection) Ratings of iButton Data Loggers and Capsule
App Note 3892 Overview of iButton® Sensors and Temperature/Humidity Data Loggers
App Note 3809 Exporting DS192x Logger Data from the OneWireViewer into Excel
App Note 3808 What Is an iButton Device?
App Note 1200 White Paper 7: Thermochron® Mission Authentication and Security
App Note 1100 White Paper 5: Using 1-Wire APIs for Data Sheet Commands
Reference Schematic 244 Advanced 1-Wire Network Driver
App Note 192 Using the DS2480B Serial 1-Wire® Line Driver
App Note 187 1-Wire Search Algorithm
App Note 159 Software Methods to Achieve Robust 1-Wire® Communication in iButton® Applications
App Note 155 1-Wire Software Resource Guide Device Description
Tutorial 148 Guidelines for Reliable Long Line 1-Wire Networks
App Note 126 1-Wire Communication Through Software
App Note 114 1-Wire File Structure
App Note 74 Reading and Writing 1-Wire® Devices Through Serial Interfaces
App Note 27 Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products

Quality and Environmental Data

Product Reliability Reports: DS1921G.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Related Resources


DS1925
iButton High-Density Temperature Logger with 122KB Data-Log Memory

  • Provides High-Quality Temperature Exposure Assessment of an End Product
  • Highly Configurable Options for Data Logging and Security
  • Physically Robust, Operationally Efficient


Type ID PDF Title
App Note 5917 Instructions for Compiling the OneWireViewer for Linux
App Note 5916 iButton Mission Data Recovery: memlog User Guide
App Note 5705 Interface 1-Wire USB Adapter with Android
App Note 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
Tutorial 5405 Choosing the Logger iButton That's Right for You
App Note 5335 Determining the Mission Parameters for Temperature Logger iButton® Devices
App Note 5057 OneWireViewer Tips and Tricks
App Note 4506 Alternatives to the DS1994L 4Kb Plus Time Memory iButton®
Reference Schematic 4477 Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note 4126 Understanding the IP (Ingress Protection) Ratings of iButton Data Loggers and Capsule
App Note 3892 Overview of iButton® Sensors and Temperature/Humidity Data Loggers
App Note 3809 Exporting DS192x Logger Data from the OneWireViewer into Excel
App Note 3808 What Is an iButton Device?
App Note 1200 White Paper 7: Thermochron® Mission Authentication and Security
App Note 1100 White Paper 5: Using 1-Wire APIs for Data Sheet Commands
Reference Schematic 244 Advanced 1-Wire Network Driver
App Note 192 Using the DS2480B Serial 1-Wire® Line Driver
App Note 187 1-Wire Search Algorithm
App Note 159 Software Methods to Achieve Robust 1-Wire® Communication in iButton® Applications
App Note 155 1-Wire Software Resource Guide Device Description
Tutorial 148 Guidelines for Reliable Long Line 1-Wire Networks
App Note 126 1-Wire Communication Through Software
App Note 114 1-Wire File Structure
App Note 74 Reading and Writing 1-Wire® Devices Through Serial Interfaces
App Note 27 Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products