19-4991; Rev 4; 4/11
Hygrochron Temperature/Humidity Logger
iButton with 8KB Data-Log Memory
DS1923
♦ Quick Access to Alarmed Devices Through 1-Wire
General Description
Conditional Search Function
®
The DS1923 temperature/humidity logger iButton is a
♦ 512 Bytes of General-Purpose Memory Plus 64
rugged, self-sufficient system that measures temperature
and/or humidity and records 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 applica-
tion-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 password protected. The DS1923 is con-
figured and communicates with a host-computing device
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
♦ Individually Calibrated in an NIST-Traceable Chamber
♦ Calibration Coefficients for Temperature and
Humidity Factory Programmed Into Nonvolatile
(NV) Memory
®
through the serial 1-Wire protocol, which requires only a
Common iButton Features
single data lead and a ground return. Every DS1923 is
factory lasered with a guaranteed unique 64-bit registra-
tion number that allows for absolute traceability. The
durable stainless-steel package is highly resistant to envi-
ronmental hazards such as dirt, moisture, and shock.
Accessories permit the DS1923 to be mounted on almost
any object, including containers, pallets, and bags.
♦ 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
Applications
Temperature and Humidity Logging in Food
Preparation and Processing
♦ Durable Stainless-Steel Case Engraved with
Transportation of Temperature-Sensitive and
Humidity-Sensitive Goods, Industrial Production
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
Warehouse Monitoring
Environmental Studies/Monitoring
Features
♦ Presence Detector Acknowledges When Reader
♦ Digital Hygrometer Measures Humidity with 8-Bit
First Applies Voltage
(0.6%RH) or 12-Bit (0.04%RH) Resolution
♦ 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
♦ Operating Range: -20°C to +85°C; 0 to 100%RH
(see Safe Operating Range Graph)
♦ Automatically Wakes Up, Measures Temperature
and/or Humidity, and Stores Values in 8KB of
Data-Log Memory in 8-Bit or 16-Bit Format
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
♦ Digital Thermometer Measures Temperature with
DS1923-F5#
-20°C to +85°C
F5 iButton
8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
#Denotes a RoHS-compliant device that may include lead(Pb)
that is exempt under the RoHS requirements.
♦ Temperature Accuracy Better Than 0.5°C from
-10°C to +65°C with Software Correction
Examples of Accessories
♦ Built-In Capacitive Polymer Humidity Sensor for
Humidity Logging
PART
ACCESSORY
Self-Stick Adhesive Pad
Multipurpose Clip
Mounting Lock Ring
Snap-In FOB
♦ Hydrophobic Filter Protects Sensor Against Dust, Dirt,
DS9096P
DS9101
Contaminants, and Water Droplets/Condensation
♦ Sampling Rate from 1s Up to 273hr
DS9093RA
DS9093A
DS9092
♦ Programmable Recording Start Delay After Elapsed
Time or Upon a Temperature Alarm Trip Point
iButton Probe
♦ Programmable High and Low Trip Points for
Pin Configuration appears at end of data sheet.
Temperature and Humidity Alarms
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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