DS1923_11 Datasheet, PDF (1/55 Pages) Maxim Integrated Products – Hygrochron Temperature/Humidity Logger

19-4991; Rev 4; 4/11
Hygrochron Temperature/Humidity Logger
iButton with 8KB Data-Log Memory
General Description
The DS1923 temperature/humidity logger iButton^® 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 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
through the serial 1-Wire^® protocol, which requires only a
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.
Applications
Temperature and Humidity Logging in Food
Preparation and Processing
♦ 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
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
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
Transportation of Temperature-Sensitive and
Humidity-Sensitive Goods, Industrial Production
♦ Durable Stainless-Steel Case Engraved with
Registration Number Withstands Harsh Environments
Warehouse Monitoring
Environmental Studies/Monitoring
Features
♦ Digital Hygrometer Measures Humidity with 8-Bit
(0.6%RH) or 12-Bit (0.04%RH) Resolution
♦ 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
♦ Digital Thermometer Measures Temperature with
8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
♦ Temperature Accuracy Better Than ±0.5°C from
-10°C to +65°C with Software Correction
♦ Built-In Capacitive Polymer Humidity Sensor for
Humidity Logging
♦ Hydrophobic Filter Protects Sensor Against Dust, Dirt,
Contaminants, and Water Droplets/Condensation
♦ Sampling Rate from 1s Up to 273hr
♦ Programmable Recording Start Delay After Elapsed
Time or Upon a Temperature Alarm Trip Point
♦ Programmable High and Low Trip Points for
Temperature and Humidity Alarms
♦ 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
DS1923-F5#
-20°C to +85°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.