Datasheet > DS1427

DS1427

更新时间： 2024-11-22 22:40:35

品牌	Logo	应用领域
达拉斯 - DALLAS		/
页数	文件大小	规格书
2页	23K
描述
Time iButton

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中文翻译

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数据手册

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DS1427 数据手册

DS1427

Time iButton

FEATURES

PACKAGE OUTLINE

• Provides a unique 64–bit serial number, 4K bits of

RAM

• No external power required

• Uses inexpensive 1–Wire protocol

• Universally portable across platforms

• Programmable secure real time clock with alarm and

elapsed timer.

16mm

DESCRIPTION

Authorization iButtons are sophisticated microelectron-

ics,sealedintominiaturestainlesssteelcans,creatinga

low cost, portable medium for storing and controlling

access to sensitive information.

tem provides easy to use commands which are

embedded into the application in order to utilize the

iButton resources during run time.

Each Dallas iButton is uniquely serialized with a 64–bit

code that is laser–etched in the silicon. This unique ID

providesabasiclevelofsecurity,istraceableinthefield,

and makes it possible to identify the specific iButton in a

field of many.

iButtons are used with port adapters as a hardware

based protection system for software. iButtons help

protect the right to copy software by actually protecting

the right to execute it. Software can now be locked to a

user, a machine, or an application with a complete audit

trail and guaranteed uniqueness.

The serial number is divided into three parts (see Figure

1). The 8–bit family code tells the Access System (and

consequently the developer) what type of iButton is

being used. The next 48 bits are lasered sequentially

with no two numbers the same. The last 8 bits contain a

Cyclic Redundancy Check (CRC) value that has been

calculated across the family code and the 48–bit serial

number. The CRC ensures that iButtoncommunication

is error free.

The DS1427 provides a 64–bit unique ID number, 4K

bits of RAM, and a programmable real time clock. The

DS1427 is used in leasing and rental applications, soft-

waremetering, andtovaryvalidprotectionkeysbytime.

Ability to distribute demonstration software that expire

on a date controlled by the deliverer.

Hardware communication with the iButtons is con-

ducted via a 1–wire interface. The conversion from a

PC I/O port to the 1–wire interface is the responsibility of

the port adapter.

The DS1427 tracks elapsed time from either initial pro-

gramming or from first access by the application soft-

ware. All timers and alarms can be locked from repro-

gramming, so that the time base is not compromised in

any way.

Software applications communicate with the iButton

using Dallas’ Access System, which is contained in any

of the port adapter Developer’s kits. The Access Sys-

021798 1/2

中文翻译

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与DS1427相关器件

型号	品牌	获取价格	描述	数据表
DS14285	DALLAS	获取价格	Real Time Clock with NV RAM Control
DS14285	ROCHESTER	获取价格	1 TIMER(S), REAL TIME CLOCK, PDIP24, 0.600 INCH, DIP-24
DS14285_05	DALLAS	获取价格	Real-Time Clock with NV RAM
DS14285+	DALLAS	获取价格	Real-Time Clock with NV RAM
DS14285+	ROCHESTER	获取价格	1 TIMER(S), REAL TIME CLOCK, PDIP24, 0.600 INCH, ROHS COMPLIANT, DIP-24
DS14285-DS14287	DALLAS	获取价格	Real Time Clock with NV RAM Control
DS14285N	DALLAS	获取价格	Real Time Clock with NV RAM Control
DS14285N	ROCHESTER	获取价格	1 TIMER(S), REAL TIME CLOCK, PDIP24, 0.600 INCH, DIP-24
DS14285N+	DALLAS	获取价格	Real-Time Clock with NV RAM
DS14285N+	ROCHESTER	获取价格	1 TIMER(S), REAL TIME CLOCK, PDIP24, 0.600 INCH, ROHS COMPLIANT, DIP-24

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