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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