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DS1922L

Temperature Logger iButton with 8KB Data-Log Memory

Maxim Integrated 

19-4990; Rev 10; 4/11

Temperature Logger iButton with 8KB

Data-Log Memory

General Description

The DS1922L/DS1922T 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 273hr, can be stored.

Additionally, 512 bytes of SRAM store application-specific

information and 64 bytes store calibration data. A mission

to collect data can be programmed to begin immediately,

after a user-defined delay, or after a temperature alarm.

Access to the memory and control functions can be pass-

word protected. The DS1922L/DS1922T are configured

and communicate with a host-computing device through

the serial 1-Wire® protocol, which requires only a single

data lead and a ground return. Each DS1922L/DS1922T 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/DS1922T to be mounted on almost

any object, including containers, pallets, and bags.

Applications

High-Temperature Logging (Process Monitoring,

Industrial Temperature Monitoring)

Temperature Logging in Cold Chain, Food Safety, Bio

Science, and Pharmaceutical and Medical Products

Features

♦ Automatically Wakes Up, Measures Temperature,

and Stores Values in 8KB of Data-Log Memory in

8-Bit 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 Corrections

♦ Water Resistant or Waterproof if Placed Inside

DS9107 iButton Capsule (Exceeds Water

Resistant 3 ATM Requirements)

♦ 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

♦ Quick Access to Alarmed Devices Through 1-Wire

Conditional Search Function

♦ 512 Bytes of General-Purpose Memory Plus 64

Bytes of Calibration Memory

♦ Two-Level Password Protection of All Memory

and Configuration Registers

♦ 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

♦ Operating Temperature Range: DS1922L: -40°C to

+85°C; DS1922T: 0°C to +125°C

Common iButton Features

♦ Digital Identification and Information by

Momentary Contact

♦ Unique Factory-Lasered 64-Bit Registration Number

Ensures Error-Free Device Selection and Absolute

Traceability Because No Two Parts Are Alike

♦ Built-In 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

♦ 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

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

DS1922L-F5#

-40°C to +85°C

F5 iButton

DS1922T-F5#

0°C to +125°C

F5 iButton

#Denotes a RoHS-compliant device that may include lead(Pb)

that is exempt under the RoHS requirements.

Examples of Accessories

PART

DS9096P

DS9101

DS9093RA

DS9093A

DS9092

ACCESSORY

Self-Stick Adhesive Pad

Multipurpose Clip

Mounting Lock Ring

Snap-in FOB

iButton Probe

Pin Configuration appears at end of data sheet.

iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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