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參數資料
| 型號： | DS1425 |
| 英文描述： | Multi iButton |
| 中文描述： | 多存儲器區iButton |
| 文件頁數： | 1/2頁 |
| 文件大小： | 19K |
| 代理商： | DS1425 |
DS1425
Multi iButton
DS1425
021798 1/2
FEATURES
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
TM
protocol
Universally portable across platforms
PACKAGE OUTLINE
16mm
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.
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.
相關PDF資料 |
PDF描述 |
|---|---|
| DS1427 | Time iButton |
| DS1481 | 1.Wire Bus Master with Overdrive |
| DS1481S | 1?Wire Bus Master with Overdrive |
| DS1482 | 1-Wire Level Shifter and Line Driver with Load Sensor |
| DS1482S | 1-Wire Level Shifter and Line Driver with Load Sensor |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS1425L-F5 | 制造商:Maxim Integrated Products 功能描述: |
| DS1427 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Time iButton |
| DS1427L-F5 | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS14285 | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS14285_05 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Real-Time Clock with NV RAM |
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