DS1923

· Digital Hygrometer Measures Humidity with 8-Bit (0.6%RH) or 12-Bit (0.04%RH) Resolution
· Operating Range: -20 to +85°C; 0 to 100%RH (see Safe Operating Range)
· Automatically Wakes Up, Measures Temperature and/or Humidity 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
· Temperature Accuracy Better than ±0.5°C from -10°C to +65°C with Software Correction
· Built-in Humidity Sensor for Simultaneous Temperature and Humidity Logging
· Capacitive Polymer Humidity-Sensing Element
· Hydrophobic Filter Protects Sensor Against Dust, Dirt, Water, and Contaminants
· 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 and Humidity Alarms
· 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 a NIST-Traceable Chamber
· Calibration Coefficients for Temperature and Humidity Factory Programmed into Nonvolatile (NV) Memory

· Temperature and Humidity Logging in Food Preparation and Processing
· Transportation of Temperature- and Humidity- Sensitive Goods, Industrial  Production
· Warehouse Monitoring
· Environmental Studies/Monitoring

IO Voltage to GND ......................................................................................-0.3V, +6V
IO Sink current ...................................................................................................20mA
Operating Temperature and Humidity Range .......-20°C to +85°C, 0%RH to 100%RH
Storage Temperature and Humidity Range ..........-40°C to +85°C, 0%RH to 100%RH

This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

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 userdefined delay or after a temperature alarm. Access to the memory and control functions can be passwordprotected. 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.