iButton Hygrochron
Temperature/Humidity Logger
with 8KB Datalog Memory
DS1923
• Programmable Recording Start Delay After Elapsed
Time or Upon a Temperature Alarm Trip Point
• ꢀ12 Bytes of General-Purpose Memory Plus
64 Bytes of Calibration Memory
General Description
®
The iButton temperature/humidity logger (DS1923) is a
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 read-
ings, 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 pro-
grammed to begin immediately, after a user-defined
delay, or after a temperature alarm. Access to the mem-
ory and control functions can be password protected.
The DS1923 is configured and communicates with a
• Two-Level Password Protection of All Memory and
Configuration Registers
• Individually Calibrated in a NIST-Traceable Chamber
• Calibration Coefficients for Temperature and
Humidity Factory Programmed Into Nonvolatile (NV)
Memory
• Rugged Construction Survives Harsh Environments
• Hydrophobic Filter Protects Sensor Against Dust,
Dirt, Contaminants, and Water Droplets/
®
Condensation with IPꢀ6 Enclosure Rating
• CE, FCC, and UL913 Certifications
host-computing device through the serial 1-Wire proto-
col, which requires only a single data lead and a ground
return. Every DS1923 is factory lasered with a guaran-
teed unique 64-bit registration number that allows for
absolute traceability. The durable stainless-steel pack-
age is highly resistant to environmental hazards such as
dirt, moisture, and shock. Accessories permit the
DS1923 to be mounted on almost any object, including
containers, pallets, and bags.
• Simple Serial Port Interfaces to Most Microcontrollers
for Rapid Data Transfer
• Communicates to Host with a Single Digital Signal
Up to 1ꢀ.4kbps at Standard Speed or Up to
12ꢀkbps in Overdrive Mode Using 1-Wire Protocol
• Quick Access to Alarmed Devices Through 1-Wire
Conditional Search Function
Applications
Temperature and Humidity Logging in Food
Preparation and Processing
Transportation of Temperature-Sensitive and
Humidity-Sensitive Goods, Industrial Production
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS1923-F5#
-20°C to +85°C
F5 Can
Warehouse Monitoring
Environmental Studies/Monitoring
#Denotes a RoHS-compliant device that may include lead(Pb)
that is exempt under the RoHS requirements.
Benefits and Features
Examples of Accessories
• High Accuracy, Full-Featured Digital Temperature and
Humidity Logger Simplifies Temperature Data
Collection and Dissemination of Electronic
Temperature Record
PART
ACCESSORY
Self-Stick Adhesive Pad
Multipurpose Clip
Mounting Lock Ring
Snap-In FOB
DS9096P
DS9101
• Digital Hygrometer Measures Humidity with 8-Bit
(0.6%RH) or 12-Bit (0.04%RH) Resolution
• Temperature Accuracy Better Than 0.ꢀ5C from
-105C to +6ꢀ5C with Software Correction
• Measures Temperature with 8-Bit (0.ꢀ5C) or 11-Bit
(0.062ꢀ5C) Resolution
DS9093RA
DS9093A
DS9092
iButton Probe
Common iButton Can Features and Pin Configuration appear
at end of data sheet.
• Operating Range: -205C to +8ꢀ5C; 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
• Built-In Capacitive Polymer Humidity Sensor for
Humidity Logging
• Sampling Rate from 1s Up to 273hr
• Programmable High and Low Trip Points for
Temperature and Humidity Alarms
iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.
19-4991; Rev 9; 10/19
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