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DS1922L, DS1922T

iButton Temperature Loggers with 8KB Data-Log Memory

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Status Explanations for product status codes

Part Number Status
DS1922L Active: In Production. See Ordering Information for details.
DS1922T Active: In Production. See Ordering Information for details.


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.

Data Sheet

Download this datasheet in PDF formatDownload Rev 12 (PDF, 494.1kB)
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This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.

Key Features

  • Automatically Wakes up, Measures Temperature and Stores Values in 8KB of Datalog Memory in 8- or 16-Bit Format
  • Digital Thermometer Measures Temperature with 8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
  • Accuracy of ±0.5°C from -10°C to +65°C (DS1922L), ±0.5°C from +20°C to +75°C (DS1922T) with Software Correction
  • Water resistant or waterproof if placed inside DS9107 iButton capsule (Exceeds Water Resistant 3 ATM requirements)
  • Sampling Rate from 1s up to 273hrs
  • Programmable Recording Start Delay After Elapsed Time or Upon a Temperature Alarm Trip Point
  • Programmable High and Low Trip Points for Temperature Alarms
  • Quick Access to Alarmed Devices Through 1-Wire Conditional Search Function
  • 512 Bytes of General-Purpose Plus 64 Bytes of Calibration Memory
  • Two-Level Password Protection of All Memory and Configuration Registers
  • Communicates to Host with a Single Digital Signal at up to 15.4kbps at Standard Speed or up to 125kbps in Overdrive Mode Using 1-Wire Protocol
  • Operating Range: DS1922L: -40 to +85°C; DS1922T: 0 to +125°C
  • Underwriters Laboratories (UL) Recognized


  • Environmental and Thermal Management Systems (HVAC)
  • Human and Animal Temperature Monitoring.
  • Monitoring of processes that require temperatures close to the boiling point of water (DS1922T only), such as pasteurization of food items.
  • Monitoring of refrigeration systems.
  • Temperature-Critical Product Shipping and Storage, such as Fresh Produce, Pharmaceuticals, and Blood Products.

Key Specifications:

iButton Products
Part Number Technology Applications Memory Type Memory Size Data Logger Type Data Logger Size Data Logger Sample Rate Data Logger Accuracy Data Logger Resolution Data Logger Measuremt. Range Security Features Prog. Alarm Unique Ware Real Time Clock Budgetary
See Notes
DS1922L  iButton
Asset Management
Temperature Data Logging
NV SRAM 512 Bytes
Hi Accuracy
8192 Byte 1s to 273hrs Correctible to ±0.5°C Selectable 8-bit (0.5°C) or 11-bit (0.0625°C) -40°C to +85°C Password Protected Temperature High/Low No Yes $30.86 @1k
DS1922T  Temperature 0°C to +125°C $44.37 @1k
See All iButton Products (26)

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.


iButton Temperature Logger
iButton Temperature Logger

More Information

New Product Press Release   2005-02-16 ]

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Document Ref.: 19-4990 Rev 12; 2013-12-05
This page last modified: 2013-12-05