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参数资料
| 型号： | DS1963S |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Memory IC:Other |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, MEDB2 |
| 封装： | MICROCAN-2 |
| 文件页数： | 19/37页 |
| 文件大小： | 349K |
| 代理商： | DS1963S |
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DS1963S
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TRANSACTION SEQUENCE
The protocol for accessing the DS1963S via the 1-Wire port is as follows:
Initialization
ROM Function Command
Memory or SHA Function Command
Transaction/Data
INITIALIZATION
All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence
consists of a reset pulse transmitted by the bus master followed by presence pulse(s) transmitted by the
slave(s). The presence pulse lets the bus master know that the DS1963S is on the bus and is ready to
operate. For more details, see the “1-Wire Signaling” section.
ROM FUNCTION COMMANDS
Once the bus master has detected a presence, it can issue one of the seven ROM function commands that
the DS1963S supports. All ROM function commands are 8 bits long. A list of these commands follows
(refer to flowchart in Figure 10):
Read ROM [33h]
This command allows the bus master to read the DS1963S’s 8-bit family code, unique 48-bit serial
number, and 8-bit CRC. This command should only be used if there is a single slave 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
read by the master will be invalid.
Match ROM [55h]
The match ROM command, followed by a 64-bit ROM sequence, allows the bus master to address a
specific DS1963S on a multidrop bus. Only the DS1963S that exactly matches the 64-bit ROM sequence
will respond to the following 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.
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 search ROM 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 3-step routine on each bit of the ROM. After one
complete pass, the bus master knows the 64-bit ROM code of one device. Additional passes will identify
the ROM codes of the remaining devices. See Chapter 5 of the Book of DS19xx iButton Standards for a
comprehensive discussion of a search ROM, including an actual example.
Skip ROM [CCh]
This command can save time in a single drop bus system by allowing the bus master to access the
memory and SHA functions without providing the 64-bit ROM code. If more than one slave is present on
the bus and, for example, a read command is issued following the Skip ROM command, data collision
will occur on the bus as multiple slaves transmit simultaneously (open drain pulldowns will produce a
wired-AND result).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1963S+F5 | 制造商:Maxim Integrated Products 功能描述:SHA IBTN 8SOIC - Rail/Tube |
| DS1963S-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 |
| DS1963S-F5+ | 功能描述:iButton SHA 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 |
| DS1965S-1-F3 | 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 |
| DS1965S-1-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 |
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