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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： | 8/27页 |
| 文件大小： | 548K |
| 代理商： | DS1986-F5 |
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DS1986
16 of 27
Read ROM [33H]
This command allows the bus master to read the DS1986’s 8-bit family code, unique 48-bit serial
number, and 8-bit CRC. This command can be used only if there is a single DS1986 on the bus. If more
than one slave is present on the bus, a data collision will occur when all slaves try to transmit at the same
time (open drain will produce a wired-AND result). The resultant family code and 48-bit serial number
will usually result in a mismatch of the CRC.
Match ROM [55H]
The match ROM command, followed by a 64-bit ROM sequence, allows the bus master to address a
specific DS1986 on a multidrop bus. Only the DS1986 that exactly matches the 64-bit ROM sequence
will respond to the subsequent memory function command. All slaves that do not match the 64-bit ROM
sequence will wait for a reset pulse. This command can be used with a single or multiple devices on the
bus.
Skip ROM [CCH]
This command can save time in a single drop bus system by allowing the bus master to access the
memory functions without providing the 64-bit ROM code. If more than one slave is present on the bus
and a read command is issued following the Skip ROM command, data collision will occur on the bus as
multiple slaves transmit simultaneously (open drain pull-downs will produce a wired-AND result).
Search ROM [F0H]
When a system is initially brought up, the bus master might not know the number of devices on the 1-
Wire bus or their 64-bit ROM codes. The search ROM command allows the bus master to use a process
of elimination to identify the 64-bit ROM codes of all slave devices on the bus. The ROM search process
is the repetition of a simple 3-step routine: read a bit, read the complement of the bit, then write the
desired value of that bit. The bus master performs this simple, 3-step routine on each bit of the ROM.
After one complete pass, the bus master knows the contents of the ROM in one device. The remaining
number of devices and their ROM codes may be identified by additional passes. See Chapter 5 of the
Book of DS19xx iButton Standards for a comprehensive discussion of a ROM search, including an actual
example.
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PDF描述 |
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| DS1991L-F5 | SPECIALTY MEMORY CIRCUIT, MEDB2 |
| DS1994L-F5 | SPECIALTY MEMORY CIRCUIT, MRDB2 |
| DS1993L-F5 | SPECIALTY MEMORY CIRCUIT, MRDB2 |
| DS1992L-F5 | SPECIALTY MEMORY CIRCUIT, MRDB2 |
| DS1996L-F5 | SPECIALTY MEMORY CIRCUIT, MADB2 |
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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