DS1425 Dallas Semiconductor, DS1425 Datasheet

DS1425

Manufacturer Part Number

DS1425

Description

Multi iButton

Manufacturer

Dallas Semiconductor

Datasheet

1.DS1425.pdf (2 pages)

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FEATURES

DESCRIPTION

Authorization iButtons are sophisticated microelectron-

ics, sealed into miniature stainless steel cans, creating a

low cost, portable medium for storing and controlling

access to sensitive information.

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 DS1425 provides a 64–bit unique ID number, and

three 384 bit fields of password protected RAM. The

DS1425 is used to provide nested levels of protection,

or to protect multiple applications.

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.

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-

tem provides easy to use commands which are

embedded into the application in order to utilize the

iButton resources during run time.

Provides a unique 64–bit serial number and three 384

bit fields of password protected RAM

Intelligent response generator included

No external power required

Uses inexpensive 1–Wire

Universally portable across platforms

protocol

PACKAGE OUTLINE

Each Dallas iButton is uniquely serialized with a 64–bit

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

provides a basic level of security, is traceable in the field,

and makes it possible to identify the specific iButton in a

field of many.

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 iButton communication

is error free.

High levels of security are achieved by storing applica-

tion code and/or data necessary for execution in the

iButton memory.

Each 384–bit secure data area is prefaced by a 64–bit

identification field and an unreadable 64–bit password.

Note that this password is user selected and pro-

grammed. This means no one, including Dallas Semi-

conductor, can access that data.

16mm

Multi iButton

DS1425

021798 1/2

DS1425

Related parts for DS1425

DS1425 Summary of contents

Page 1

... Software can now be locked to a user, a machine application with a complete audit trail and guaranteed uniqueness. The DS1425 provides a 64–bit unique ID number, and three 384 bit fields of password protected RAM. The DS1425 is used to provide nested levels of protection protect multiple applications ...

Page 2

... DS1425 If the DS1425 is presented with a valid password from the host application, the contents of the secure data will be returned. However, if the DS1425 is presented with an invalid password, the on–board intelligent response generator will return what seems normal response, but is not. The false response will be unique to the false access ...

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