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參數(shù)資料
| 型號： | DS1921 |
| 英文描述： | High-Resolution Thermochron iButton |
| 中文描述： | 高分辨率Thermochron iButton的 |
| 文件頁數(shù)： | 25/44頁 |
| 文件大?。?/td> | 271K |
| 代理商： | DS1921 |
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DS1921H/Z
25 of 44
HARDWARE CONFIGURATION
Figure 12
Open Drain
Port Pin
RX = RECEIVE
TX = TRANSMIT
100
MOSFET
V
PUP
RX
TX
TX
RX
DATA
5μA
Typ.
BUS MASTER
DS1921 1-Wire PORT
R
PUP
TRANSACTION SEQUENCE
The protocol for accessing the DS1921H/Z via the 1-Wire port is as follows:
Initialization
ROM Function Command
Memory/Control 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 DS1921H/Z 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. All
ROM function commands are eight bits long. A list of these commands follows (refer to flowchart in
Figure 13).
Read ROM [33h]
This command allows the bus master to read the DS1921H/Z’s 8-bit family code, temperature range code,
plus unique 36-bit serial number and 8-bit CRC. This command can 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
temperature range code plus 36-bit serial number will 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 DS1921H/Z on a multidrop bus. Only the DS1921H/Z that exactly matches the 64-bit ROM
sequence will respond to the following memory function command. All other slaves will wait for a reset
pulse. This command can be used with a single or multiple devices on the bus.
相關PDF資料 |
PDF描述 |
|---|---|
| DS1921H-F5 | High-Resolution Thermochron iButton |
| DS1921Z-F5 | High-Resolution Thermochron iButton |
| DS1963L-F5 | NVRAM (Battery Based) |
| DS1963S | SHA iButton |
| DS1971 | 256-Bit EEPROM iButton |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1921G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Thermochron iButton |
| DS1921G_11 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Logs Up to 2048 Consecutive Temperature Thermochron iButton |
| DS1921G_1109 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Thermochron iButton |
| DS1921G_12 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Thermochron iButton |
| DS1921G-F5 | 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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