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参数资料
| 型号： | DS1986-F5 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Programmable ROM |
| 英文描述： | 64K X 1 OTPROM, MADB2 |
| 封装： | MICROCAN-2 |
| 文件页数： | 21/27页 |
| 文件大小： | 548K |
| 代理商： | DS1986-F5 |
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DS1986
3 of 27
Function Commands is described in Figure 8. After a ROM Function Command is successfully executed,
the memory functions that operate on the EPROM portions of the DS1986 become accessible and the bus
master may issue any one of the five Memory Function Commands specific to the DS1986 to read or
program the various data fields. The protocol for these Memory Function Commands is described in
Figure 5. All data is read and written least significant bit first.
64-BIT LASERED ROM
Each DS1986 contains a unique ROM code that is 64 bits long. The first eight bits are a 1-Wire family
code. The next 48 bits are a unique serial number. The last eight bits are a CRC of the first 56 bits. (See
Figure 3.) The 64-bit ROM and ROM Function Control section allow the DS1986 to operate as a 1-Wire
device and follow 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 functions 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 successfully 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 X8 + X5 + X4 + 1. Additional
information about the Dallas Semiconductor 1-Wire Cyclic Redundancy Check is available in the Book
of DS19xx iButton Standards. The shift register acting as the CRC accumulator 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1986-F5# | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1986-F5+ | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1986U | 制造商:未知厂家 制造商全称:未知厂家 功能描述:UniqueWare iButton |
| DS1990 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Serial Number iButton |
| DS1990A | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Serial Number iButton |
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