DS1922L Datasheet, PDF (1/48 Pages) Dallas Semiconductor – Temperature Logger iButton With 8kB Datalog Memory

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GENERAL 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.
APPLICATIONS
Temperature Logging in Cold Chain, Food Safety,
Bio Science, and Pharmaceutical and Medical
Products
High-Temperature Logging (Process Monitoring,
Industrial Temperature Monitoring)
ORDERING INFORMATION
PART
TEMP RANGE
PACKAGE
DS1922L-F5 -40°C to +85°C F5 iButton
DS1922T-F5 0°C to +125°C F5 iButton
See page 11 for Common iButton Features and
Examples of Accessories.
Commands, Registers, and Modes are capitalized for
clarity.
iButton and 1-Wire are registered trademarks of Dallas Semiconductor.
DS1922L, DS1922T
Temperature Logger iButton
With 8kB Datalog Memory
SPECIAL FEATURES
§ Automatically Wakes up, Measures Tempera-
ture, 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 Better than ±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 - 1 meter under water for 30 days
§ 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
PIN CONFIGURATION
5.89
0.51
â
16.25
0^A0¹0000FBC^â52⁴B¹
1-Wire^â
17.35
IO
GND
ALL DIMENSIONS ARE SHOWN IN MILLIMETERS.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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