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參數(shù)資料
| 型號(hào)： | DS1991L-F5 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Memory IC:Other |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, MEDB2 |
| 封裝： | MICROCAN-2 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 281K |
| 代理商： | DS1991L-F5 |
DS1991
4 of 14
DS1991 COMMAND STRUCTURE Figure 4
2
nd byte
3
rd byte
Command
1
st byte
B7
B6
B5
B4
B3
B2
B1 B0
write
scratchpad
96H
read
scratchpad
69H
1
any value
00H to 3FH
copy
scratchpad
3CH
0
read
SubKey
66H
write
SubKey
99H
any value
10H to 3FH
write
password
5AH
Sub-Key
Nr.:
0
or
0
1
or
1
0
ones complement
of 2
nd byte
SCRATCHPAD COMMANDS
The 64-byte read/write scratchpad of the DS1991 is not password-protected. Its normal use is to build up
a data structure to be verified and then copied to a secure subkey.
Write Scratchpad [96H]
The Write Scratchpad command is used to enter data into the scratchpad. The starting address for the
write sequence is specified in the command. Data can be continuously written until the end of the
scratchpad is reached or until the DS1991 is reset. The command sequence is shown in Figure 5, first
page, left column.
Read Scratchpad [69H]
The Read Scratchpad command is used to retrieve data from the scratchpad. The starting address is
specified in the command word. Data can be continuously read until the end of the scratchpad is reached
or until the DS1991 is reset. The command sequence is shown in Figure 5, first page, center column.
Copy Scratchpad [3CH]
The Copy Scratchpad command is used to transfer specified data blocks from the scratchpad to a selected
subkey. This command should be used when data verification is required before storage in a secure
subkey. Data can be transferred in single 8-byte blocks or in one large 64-byte block. There are nine valid
block selector codes that are used to specify which block is to be transferred (Figure 6). As a further
precaution against accidental erasure of secure data, the 8-byte password of the destination subkey must
be entered. If the password does not match, the operation is terminated. After the block of data is
transferred to the secure subkey, the original data in the corresponding block of the scratchpad is erased.
The command sequence is shown in Figure 5, first page, right column.
SUBKEY COMMANDS
Each of the subkeys within the DS1991 is accessed individually. Transactions to read and write data to a
secured subkey start at the address defined in the command and proceed until the device is reset or the
end of the subkey is reached.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1991L-F5/A1A | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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 |
| DS1991L-F5+ | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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 |
| DS1991L-F5+A1A | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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 |
| DS1991L-F5W | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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 |
| DS1991LP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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