General Description

The iButton® high-temperature logger (DS1922E) 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.

Benefits and Features

• High Accuracy, Full-Featured Digital Temperature Logger Simplifies Temperature Data Collection and Dissemination of Electronic Temperature Record

    • Temperature Accuracy: ±1.5°C from +110°C to +140°C, ±7°C typical from +15°C to +110°C

    • Measures Temperature with 8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution

    • Operating Temperature Range: +15°C to +140°C

    • Automatically Wakes Up, Measures Temperature, and Stores Values in 8KB of Data-Log Memory in 8- or 16-Bit Format

    • 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

    • 576 Bytes of General-Purpose Memory

    • Two-Level Password Protection of All Memory and Configuration Registers

    • Rugged Construction Survives Harsh Environments

    • Water Resistant or Waterproof if Placed Inside DS9107 iButton Capsule (Exceeds Water Resistant 3 ATM Requirements)

• 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

Common iButton Device Features

• Rugged Chip-Based Data Carrier with Fast, Simple Access to Information

    • 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 an 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

Application

    High-Temperature Logging (Process Monitoring, Industrial Temperature Monitoring)

    Steam Sterilization