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參數(shù)資料
| 型號： | DS1994L-F5 |
| 英文描述： | 4kb Plus Time Memory iButton |
| 中文描述： | 4KB的另外iButton的時間內(nèi)存 |
| 文件頁數(shù)： | 9/22頁 |
| 文件大小： | 254K |
| 代理商： | DS1994L-F5 |
DS1994
ending offset/data status Byte (E/S), followed by the scratchpad data beginning at the Byte offset (T4:T0).
The user can read data until the end of the scratchpad, after which the data read is all logic 1’s.
9 of 22
Copy Scratchpad [55h]
This command is used to copy data from the scratchpad to memory. After issuing the copy scratchpad
command, the user must provide a 3-Byte authorization pattern. This pattern must exactly match the data
contained in the three address registers (TA1, TA2, E/S, in that order). If the pattern matches, the AA
(authorization accepted) flag is set and the copy begins. A logic 0 is transmitted after the data has been
copied until the user issues a reset pulse. Any attempt to reset the part is ignored while the copy is in
progress. Copy typically takes 30 s.
The data to be copied is determined by the three address registers. The scratchpad data, from the
beginning offset through the ending offset, is copied to memory, starting at the target address. Anywhere
from 1 to 32 Bytes can be copied to memory with this command. Whole Bytes are copied even if only
partially written. The AA flag is cleared only by executing a write scratchpad command.
Read Memory [F0h]
The read memory command can be used to read the entire memory. After issuing the command, the user
must provide the 2-Byte target address. After the two Bytes, the user reads data beginning from the target
address and can continue until the end of memory, at which point logic 1’s are read. It is important to
realize that the target address registers contain the address provided. The ending offset/data status Byte is
unaffected.
The hardware of the DS1994 provides a means to accomplish error-free writing to the memory section.
To safeguard reading data in the 1-Wire environment and to simultaneously speed up data transfers, it is
recommended to packetize data into data packets of the size of one memory page each. Such a packet
would typically store a 16-bit CRC with each page of data to ensure rapid, error-free data transfers that
eliminate having to read a page multiple times to determine if the received data is correct or not. (Refer to
Application Note 114 for the recommended file structure to be used with the 1-Wire environment.)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1994 | 4kb Plus Time Memory iButton |
| DS1995 | 16-kbit Memory iButton |
| DS1995L-F5 | 16-kbit Memory iButton |
| DS1996 | 64kbit Memory iButtonTM |
| DS1996L-F5 | 64kbit Memory iButtonTM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1994L-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 |
| DS1994L-F5-W | 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 |
| DS1994-LFS | 制造商: 功能描述: 制造商:undefined 功能描述: |
| DS1995 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:16-kbit Memory iButton |
| DS1995L-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 |
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