DS1994L-F5中文资料Dallas数据手册PDF规格书

iButton DESCRIPTION

The DS1992/DS1993 memory iButtons (hereafter referred to as DS199_) are rugged read/write data carriers that act as a localized database, easily accessible with minimal hardware. The nonvolatile memory and optional timekeeping capability offer a simple solution to storing and retrieving vital information pertaining to the object to which the iButton is attached. Data is transferred serially through the 1-Wire protocol that requires only a single data lead and a ground return.

SPECIAL FEATURES

■ 4096 bits of Read/Write Nonvolatile

Memory (DS1993)

■ 1024 bits of Read/Write Nonvolatile

Memory (DS1992)

■ 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

■ Operating Temperature Range from -40°C to

+70°C

■ Over 10 years of data retention

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 MicroLAN

■ 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 CupShaped 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