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 readings, 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.
Benefits and Features
• High Accuracy, Full-Featured Digital Temperature and Humidity Logger Simplifies Temperature Data Collection and Dissemination of Electronic Temperature Record
• Digital Hygrometer Measures Humidity with 8-Bit (0.6%RH) or 12-Bit (0.04%RH) Resolution
• Temperature Accuracy Better Than ±0.5°C from -10°C to +65°C with Software Correction
• Measures Temperature with 8-Bit (0.5°C) or 11-Bit (0.0625°C) 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
• 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
• Programmable Recording Start Delay After Elapsed Time or Upon a Temperature Alarm Trip Point
• 512 Bytes of General-Purpose Memory Plus 64 Bytes of Calibration Memory
• 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 IP56 Enclosure Rating
• CE, FCC, and UL913 Certifications
• Simple Serial Port Interfaces to Most Microcontrollers for Rapid Data Transfer
• Communicates to Host with a Single Digital Signal Up to 15.4kbps at Standard Speed or Up to 125kbps 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
Warehouse Monitoring
Environmental Studies/Monitoring