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参数资料
| 型号： | DS1420 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Memory IC:Other |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, MEDB2 |
| 文件页数： | 1/1页 |
| 文件大小： | 16K |
| 代理商： | DS1420 |
DS1420
Serial ID Button
DS1420
8-BIT CRC CODE
48-BIT SERIAL NUMBER NUMBER
10000001
MSB
FAMILY CODE 82H
021798 1/1
FEATURES
Provides a unique 64–bit serial number
No external power required
Uses inexpensive 1–wire protocol
Universally portable across platforms
PACKAGE OUTLINE
16mm
DESCRIPTION
Authorization Buttons are sophisticated microelectron-
ics, sealed into miniature stainless steel cans, creating a
low cost, portable medium for storing and controlling
access to sensitive information.
Buttons are used with Button Holders as a hardware
based protection system for software. Buttons help pro-
tect 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 DS1420 is a Button that provides a 64–bit unique ID
number, and is typically used to uniquely identify a per-
son or a machine.
Hardware communication with Buttons 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 Button
Holder.
Software applications communicate with the Button
using Dallas’ Access System, which is contained in any
of the Button Holder Developer’s kits. The Access Sys-
tem provides software developers with easy to use
commands which are embedded into the application in
order to utilize the Button resources during run time.
For more information on the Access System, please ref-
erence any of the Button Holder data sheets.
Each Dallas Button 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 Button 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 Button 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 Button communication
is error free.
SERIAL NUMBER ORGANIZATION Figure 1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1421MP000 | 制造商:Thomas & Betts 功能描述:100A,PLG,3P4W,MG,421,3P440V |
| DS1421MP00K | 制造商:Thomas & Betts 功能描述:100A,PLG,3P4W,MG,421,00K,3P400V |
| DS1421MR000 | 制造商:Thomas & Betts 功能描述:100A,NLT,3P4W,MG,421,3P440V |
| DS1422 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:1 kbit Add-Only UniqueWare Button |
| DS1423FP000 | 制造商:Thomas & Betts 功能描述:150A,CON,3P4W,MG,3P480V,SC |
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