DS1923_1 Datasheet, PDF (1/53 Pages) Dallas Semiconductor – Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory

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DS1923
Hygrochron Temperature/Humidity Logger
iButton with 8kB Data Log Memory
SPECIAL FEATURES
ƒ Digital Hygrometer Measures Humidity with 8-Bit
(0.6%RH) or 12-Bit (0.04%RH) Resolution
ƒ Operating Range: -20 to +85°C; 0 to 100%RH
(see Safe Operating Range)
ƒ Automatically Wakes Up, Measures Temperature
and/or Humidity and Stores Values in 8kB of
Datalog Memory in 8- or 16-Bit Format
ƒ Digital Thermometer Measures Temperature with
8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
ƒ Temperature Accuracy Better than ±0.5°C from
-10°C to +65°C with Software Correction
ƒ Built-in Humidity Sensor for Simultaneous
Temperature and Humidity Logging
ƒ Capacitive Polymer Humidity-Sensing Element
ƒ Hydrophobic Filter Protects Sensor Against Dust,
Dirt, Contaminants, and Water
Droplets/Condensation
ƒ Sampling Rate from 1s up to 273hrs
ƒ Programmable Recording Start Delay After
Elapsed Time or Upon a Temperature Alarm Trip
Point
ƒ Programmable High and Low Trip Points for
Temperature and Humidity Alarms
ƒ Quick Access to Alarmed Devices Through
1-Wire^® Conditional Search Function
ƒ 512 Bytes of General-Purpose Memory Plus 64
Bytes of Calibration Memory
ƒ Two-Level Password Protection of All Memory
and Configuration Registers
ƒ 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
ƒ Individually Calibrated in a NIST-Traceable
Chamber
ƒ Calibration Coefficients for Temperature and
Humidity Factory Programmed into Nonvolatile
(NV) Memory
iButton 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 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 DS1923 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 DS1923 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 DS1923
to be mounted on almost any object, including
containers, pallets and bags.
F5 MICROCAN
5.89
0.51
®
16.25
17.35
APPLICATIONS
ƒ Temperature and Humidity Logging in Food
IO
Preparation and Processing
ƒ Transportation of Temperature- and Humidity-
Sensitive Goods, Industrial Production
ƒ Warehouse Monitoring
ƒ Environmental Studies/Monitoring
ORDERING INFORMATION
PART
TEMP RANGE PACKAGE
DS1923-F5 -20°C to +85°C F5 iButton
1-Wire and iButton are registered trademarks and Hygrochron is
a trademark of Dallas Semiconductor, Corp., a wholly owned
subsidiary of Maxim Integrated Products, Inc.
1 of 53
GND
Front Side Brand
All dimensions are
®
shown in millimeters.
A1
® 41
000000FBC52B
1-Wire^®
Hygrochron^TM
Back Side Brand
REV: 120507