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參數(shù)資料
| 型號： | DS1986 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 64K bit Add-Only iButton(64K位只加按鈕) |
| 中文描述： | 64K位只添加iButton® |
| 文件頁數(shù)： | 3/24頁 |
| 文件大小： | 164K |
| 代理商： | DS1986 |
PARASITE POWER
1–WIRE FUNCTION
CONTROL
64–BIT LASERED
ROM
PROGRAM
VOLTAGE
DETECT
MEMORY
FUNCTION
CONTROL
8–BIT
SCRATCHPAD
16–BIT CRC
GENERATOR
64K BIT EPROM
(256 PAGES OF 32 BYTES)
352 EPROM
STATUS BYTES
DATA
1–WIRE
BUS
DS1986
052298 3/24
The 64–bit ROM and ROM Function Control section
allow the DS1986 to operate as a 1–Wire device and fol-
low the 1–Wire protocol detailed in the section “1–Wire
Bus System”. The memory functions required to read
and program the EPROM sections of the DS1986 are
not accessible until the ROM function protocol has been
satisfied. This protocol is described in the ROM func-
tions flow chart (Figure 8). The 1–Wire bus master must
first provide one of six ROM function commands: 1)
Read ROM, 2) Match ROM, 3) Search ROM, or 4) Skip
ROM, 5) Overdrive-Skip ROM, or 6) Overdrive–Match
ROM. After a ROM function sequence has been suc-
cessfully executed, the bus master may then provide
any one of the memory function commands specific to
the DS1986 (Figure 5).
The 1–Wire CRC of the lasered ROM is generated using
the polynomial X
8
+ X
5
+ X
4
+ 1. Additional information
about the Dallas Semiconductor 1–Wire Cyclic Redun-
dancy Check is available in the Book of DS19xx iButton
Standards. The shift register acting as the CRC accu-
mulator is initialized to zero. Then starting with the least
significant bit of the family code, one bit at a time is
shifted in. After the eighth bit of the family code has been
entered, then the serial number is entered. After the
48th bit of the serial number has been entered, the shift
register contains the CRC value. Shifting in the eight bits
of CRC should return the shift register to all zeroes.
DS1986 BLOCK DIAGRAM
Figure 1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1986+F3 | 制造商:Maxim Integrated Products 功能描述:ADD-O IBTN 64KB, F3 (GENERIC) LFREE - Rail/Tube |
| DS19860-F3-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 |
| DS1986-F3 | 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 |
| DS1986-F3# | 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 |
| DS1986-F3+ | 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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