- 您現(xiàn)在的位置：買賣IC網 > PDF目錄376969 > DS2432 1k-Bit Protected 1-Wire EEPROM with SHA-1 Engine PDF資料下載
參數(shù)資料
| 型號： | DS2432 |
| 元件分類： | DRAM |
| 英文描述： | 1k-Bit Protected 1-Wire EEPROM with SHA-1 Engine |
| 中文描述： | 1Kb、保護型1-Wire EEPROM，帶有SHA-1引擎 |
| 文件頁數(shù)： | 5/30頁 |
| 文件大?。?/td> | 165K |
| 代理商： | DS2432 |
第1頁第2頁第3頁第4頁當前第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁
PRELIMINARY
The secret can be installed either by copying data from the scratchpad to the secrets memory or by
computation using the current secret and the scratchpad contents as partial secret. The secret cannot be
read directly; only the SHA engine has access to it for computing message authentication codes.
DS2432
5 of 30
The address range 0088h to 008Fh, also referred to as register page, contains special function registers as
well as general-purpose user-bytes and one factory byte. Once programmed to AAh or 55h, most of these
bytes become write-protected and can no longer be altered. All other codes will neither write-protect the
address nor activate the special function associated to that particular byte. Special functions are: 1) write-
protecting only the secret, 2) write-protecting all four data memory pages simultaneously, 3) activating
EPROM mode for data memory page 1 only, and 4) write-protecting data memory page 0 only. Once the
EPROM mode is activated, bits in the address range 0020h through 003Fh can only be altered from a
logic 1 to a logic 0, provided that the data memory is not write protected.
The factory byte will either read 55H or AAh. Typically, this address will read 55h, indicating that the
addresses 008E and 008F are read/write user-bytes without any special function or locking mechanism.
The code of AAh indicates that these two bytes are programmed with a 16-bit manufacturer ID and then
write-protected at the factory. The manufacturer ID can be a customer-supplied identification code that
assists the application software in identifying the product the DS2432 is associated with and in faster
selection of the applicable secret. To setup and register a manufacturer ID contact the factory.
The address range 0090h to 0097h provides an alternate way to read the device’s ROM registration
number. The family code is stored at the lower address followed by the 48-bit serial number and the 8-bit
CRC, which is stored at address 0097h. In reading through these addresses (0090h to 0097h) the bus
master will receive the individual bits of the registration number in exactly the same sequence as with a
ROM function command.
ADDRESS REGISTERS
Figure 6
Bit #
7
6
5
4
3
2
1
0
Target Address (TA1)
T7
T6
T5
T4
T3
T2
(0)
T1
(0)
T0
(0)
Target Address (TA2)
T15
T14
T13
T12
T11
T10
T9
T8
Ending Address with
Data Status (E/S)
(Read Only)
AA
1
PF
1
1
E2
(1)
E1
(1)
E0
(1)
ADDRESS REGISTERS AND TRANSFER STATUS
The DS2432 employs three address registers: TA1, TA2 and E/S (Figure 6). These registers are common
to many other 1-Wire devices but operate slightly differently with the DS2432. Registers TA1 and TA2
must be loaded with the target address to which the data will be written or from which data will be read.
Register E/S is a read-only transfer-status register, used to verify data integrity with write commands.
Since the scratchpad of the DS2432 is designed to accept data in blocks of eight bytes only, the lower
three bits of TA1 will be forced to 0 and the lower three bits of the E/S register (Ending Offset) will
always read 1. This indicates that all the data in the scratchpad will be used for a subsequent copying into
main memory or secret. Bit 5 of the E/S register, called PF or “partial byte flag”, is a logic-1 if the
相關PDF資料 |
PDF描述 |
|---|---|
| DS2432P | 1k-Bit Protected 1-Wire EEPROM with SHA-1 Engine |
| DS2432X | 1k-Bit Protected 1-Wire EEPROM with SHA-1 Engine |
| DS2432 | 1k-Bit Protected 1-Wire EEPROM with SHA-1 Engine(1K 位具有寫保護的1線EEPROM（帶SHA-1引擎）) |
| DS2433 | 4k-Bit 1-Wire EEPROM |
| DS2433-Z01 | 4K-Bit 1-Wire EEPROM |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS2432_12 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1Kb Protected 1-Wire EEPROM with SHA-1 Engine |
| DS2432P | 功能描述:電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| DS2432P R | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1Kb Protected 1-Wire EEPROM with SHA-1 Engine |
| DS2432P T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1Kb Protected 1-Wire EEPROM with SHA-1 Engine |
| DS2432P/T&R | 功能描述:電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
發(fā)布緊急采購，3分鐘左右您將得到回復。