iButton Temperature Loggers with 8KB Data-Log Memory

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The iButton® temperature loggers (DS1922L/T) 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. A total of 8192 8-bit readings or 4096 16-bit readings taken at equidistant intervals ranging from 1s to 273hrs can be stored. In addition to this, there are 512 bytes of SRAM for storing application-specific information and 64 bytes for calibration data. A mission to collect data can be programmed to begin immediately, or after a user-defined delay or after a temperature alarm. Access to the memory and control functions can be password protected. The DS1922L/T is configured and communicates with a host computing device through the serial 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1922L/T is factory-lasered with a guaranteed unique 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 DS1922L/T to be mounted on almost any object, including containers, pallets, and bags.

While all iButton data loggers are calibrated/validated against NIST traceable reference devices, Maxim offers a web application to generate validation certificates for the DS1922L/T data loggers. Input is an iButton registration number (or list of numbers) and the output is a validation certificate in PDF format.

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Key Features

  • High Accuracy, Full-Featured Digital Temperature Logger Simplifies Temperature Data Collection and Dissemination of Electronic Temperature Record
    • Temperature Accuracy of ±0.5°C from -10°C to +65°C (DS1922L), ±0.5°C from +20°C to +75°C (DS1922T), with Software Corrections
    • Measures Temperature with 8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
    • Operating Temperature Range: DS1922L: -40°C to +85°C; DS1922T: 0°C to +125°C
    • Automatically Wakes Up, Measures Temperature, and Stores Values in 8kB of Data-Log Memory in 8- or 16-Bit Format
    • Sampling Rate from 1s Up to 273hr
    • Programmable High and Low Trip Points for Temperature Alarms
    • Programmable Recording Start Delay After Elapsed Time or Upon a Temperature Alarm Trip Point
    • 512 Bytes of General-Purpose Memory Plus 64 Bytes of Calibration Memory
    • Two-Level Password Protection of All Memory and Configuration Registers
    • Individually Calibrated in a NIST-Traceable Chamber
    • Complies to Standard EN12830
  • 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
    • Quick Access to Alarmed Devices Through 1-Wire Conditional Search Function


  • High-Temperature Logging (Process Monitoring, Industrial Temperature Monitoring)
  • Temperature Logging in Cold Chain, Food Safety, Bio Science, and Pharmaceutical and Medical Products

See parametric specs for Data Loggers (8)

Part NumberInterfaceTechnologyApplicationsUsageMemory TypeMemory SizeData Logger TypeTemp. ReadingsOper. Temp.
See Notes
DS1922L 1-WireiButtonAsset ManagementMulti UseSRAM512 BytesTemperature8192-40 to +85$46.99 @1k
Asset Management
Industrial Monitoring
Process Monitoring
0 to +125$71.81 @1k

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.
Product Reliability Reports: DS1922T.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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