DS1994 Просмотр технического описания (PDF) - Maxim Integrated

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DS1994

4Kb Plus Time Memory iButton®

Maxim Integrated 

19-5049; 11/09

DS1994

DS1994

4Kb Plus Time Memory iButton®

www.maxim-ic.com

SPECIAL FEATURES

 4096 bits of Read/Write Nonvolatile Memory

 256-bit Scratchpad Ensures Integrity of Data

Transfer

 Memory Partitioned into 256-bit Pages for

Packetizing Data

 Data Integrity Assured with Strict Read/Write

Protocols

 Contains Real-Time Clock/Calendar in Binary

Format

 Interval Timer Can Automatically Accumulate

Time When Power is Applied

 Programmable Cycle Counter can Accumulate

the Number of System Power-On/Off Cycles

 Programmable Alarms Can Be Set to Generate

Interrupts for Interval Timer, Real-Time

Clock, and/or Cycle Counter

 Write-Protect Feature Provides Tamperproof

Time Data

 Programmable Expiration Date That Limits

Access to SRAM and Timekeeping

 Clock Accuracy is Better Than ±2 Minutes/

Month at 25°C

 Operating Temperature Range from -40°C to

+70°C

 Over 10 Years of Data Retention

F5 MicroCan

iButton and 1-Wire are registered trademarks of Maxim Integrated

Products, Inc.

COMMON iButton FEATURES

 Unique, Factory-Lasered, and Tested 64-bit

Registration Number (8-bit Family Code +

48-bit Serial Number + 8-bit CRC Tester)

Assures Absolute Traceability Because No

Two Parts Are Alike

 Multidrop Controller for 1-Wire Network

 Digital Identification and Information by

Momentary Contact

 Chip-Based Data Carrier Compactly Stores

Information

 Data Can Be Accessed While Affixed to

Object

 Economically Communicates to Bus Master

with a Single Digital Signal at 16.3kbps

 Standard 16mm Diameter and 1-Wire®

Protocol Ensure Compatibility with iButton

Family

 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 (4th Edit.); Intrinsically Safe

Apparatus, Approved under Entity Concept

for Use in Class I, Division 1, Group A, B, C

and D Locations

ORDERING INFORMATION

DS1994L-F5+

F5 MicroCan

+Denotes a lead(Pb)-free/RoHS-compliant package.

EXAMPLES OF ACCESSORIES

DS9096P Self-Stick Adhesive Pad

DS9101 Multi-Purpose Clip

DS9093RA Mounting Lock Ring

DS9093F Snap-In Fob

DS9092 iButton Probe

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