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DS1427

Dallas Semiconducotr
Part Number DS1427
Manufacturer Dallas Semiconducotr
Description Time iButton
Published Apr 16, 2005
Detailed Description DS1427 DS1427 Time iButton FEATURES PACKAGE OUTLINE • Provides RAM a unique 64–bit serial number, 4K bits of • No ...
Datasheet PDF File DS1427 PDF File

DS1427
DS1427

Overview
DS1427 DS1427 Time iButton FEATURES PACKAGE OUTLINE • Provides RAM a unique 64–bit serial number, 4K bits of • No external power required • Uses inexpensive 1–WireTM protocol • Universally portable across platforms • Programmable secure real time clock with alarm and elapsed timer.
16mm DESCRIPTION Authorization iButtons are sophisticated microelectronics, 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 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, software metering, and to vary valid protection keys by time.
Ability to distribute demonstration software that expire on a date controlled by the deliverer.
Hardware communication with the iButtons is conducted 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 System 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 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...


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