General Description
The DS1922E temperature logger iButton® is a rugged, self-sufficient system that measures temperature 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, 576 bytes of SRAM store application-specific information. A mission to collect data can be programmed to begin immediately, after a user-defined delay, or after a temperature alarm.

FEATUREs
♦ Automatically Wakes Up, Measures Temperature, and Stores Values in 8KB of Data-Log 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: ±1.5°C from +110°C to +140°C, ±7°C typical from +15°C to +110°C
♦ Water Resistant or Waterproof if Placed Inside DS9107 iButton Capsule (Exceeds Water Resistant 3 ATM Requirements)
♦ Sampling Rate from 1s Up to 273hr
♦ Programmable High and Low Trip Points for Temperature Alarms
♦ Programmable Recording Start Delay After Elapsed Time or Upon a Temperature Alarm Trip Point
♦ Quick Access to Alarmed Devices Through 1-Wire Conditional Search Function
♦ 576 Bytes of General-Purpose Memory
♦ Two-Level Password Protection of All Memory and Configuration Registers
♦ 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
♦ Operating Temperature Range: +15°C to +140°C

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
♦ Durable Stainless-Steel Case Engraved with Registration Number Withstands Harsh Environments
♦ 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*

APPLICATIONs
    High-Temperature Logging (Process Monitoring, Industrial Temperature Monitoring)
    Steam Sterilization