Maxim > Products > iButton® Devices > DS1922L, DS1922T
Maxim > Products > Thermal Management > DS1922L, DS1922T

DS1922L, DS1922T

Temperature Logger iButton with 8KB Datalog Memory

Temperature Data-Logger iButtons Feature 8KB Datalog Memory

Overview

Technical Documents

Ordering Info

Status

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

Description

The DS1922L/T temperature logger 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. 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	Rev 10	(PDF, 716kB)
E-Mail

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
Meets UL 913, 5th Ed., Rev. 1997-02-24; Intrinsically Safe Apparatus, Approved under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations
Underwriters Laboratories (UL) Recognized

Applications/Uses

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

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

Smallest Available Pckg.
(mm²)

Budgetary Price

max w/pins

See Notes

DS1922L

Asset Management

Temperature Data Logging

NV SRAM

512 Bytes

Hi Accuracy

Temperature

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

Yes

301

$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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

iButton

More Information

New Product Press Release

[ 2005-02-16 ]

Didn't Find What You Need?

Next Day Product Selection Assistance from Applications Engineers
Parametric Search
Applications Help

Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-4990 Rev 10; 2011-04-28
This page last modified: 2011-04-28