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參數(shù)資料
| 型號(hào)： | DS1977-F5 |
| 英文描述： | 32KB EEPROM iButton |
| 中文描述： | 32KB的EEPROM的iButton的 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 102K |
| 代理商： | DS1977-F5 |
Page 7
1/31/03
the scratchpad from where the master can read it by issuing read time slots. This loop of strong
pull-up and reading 64 bytes can be repeated until the end of the memory is reached, at which
point the master will read logic 1's.
After the DS1977 has received the password, the 1-Wire master must activate the strong pull-up.
Verify Password [C3h]
This command allows the user to verify whether the process of updating a password was
successful, eliminating the risk of a weak programming of the memory cells that actually store the
password. First disable the use of passwords. Then using Write Scratchpad, Read Scratchpad
and Copy Scratchpad, write the new password to its respective memory location. Now use Verify
Password to double-check whether the password reads correctly from the EEPROM memory. The
Verify Password command does not reveal the password, neither in the clear nor in its scrambled
form, as it is stored in memory. Instead, the user will learn whether the password transmitted with
this command, after having passed the scrambler, matches the password read from the memory.
If the match is successful, it is safe to again enable passwords.
Read Version Command [CCh]
This command allows the 1-Wire master to read the chip revision code of the DS1977. After
issuing the command code, the master sends two 00h-bytes to access the version register. With
the next 16 time slots the master receives two copies of the content of the version register.
Additional read-time slots will read logic 1's. Only the upper 3 bits of the version register are valid.
The lower 5 bits will all read 0.
ROM Functions
The DS1977 supports the following ROM functions:
Read ROM
Match ROM
Search ROM
Skip ROM
Resume
Overdrive Skip ROM
Overdrive Match ROM
These functions are implemented in the same way as with other 1-Wire devices.
For the detailed flow charts refer to Figure .
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1982U | UniqueWare iButton |
| DS1985U | UniqueWare iButton |
| DS1986 | 64 kbit Add-Only iButton |
| DS1986-F3 | EPROM|256X32X8|BUTTON|METAL |
| DS1986F5 | EPROM|256X32X8|BUTTON|METAL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1977-F5- | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Password-Protected 32KB EEPROM iButton |
| DS1977-F5# | 功能描述:iButton Password-Protected 32KB EEPROM 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 |
| DS1977-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 |
| DS1981U-F3-1125+ | 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 |
| DS1981U-F3-114C+ | 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 |
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