參數(shù)資料
型號(hào)： DS1920
英文描述： Temperature iButton
文件頁(yè)數(shù)： 9/22頁(yè)
文件大?。?/td> 729K
代理商： DS1920
DS1920
9 of 22
HARDWARE CONFIGURATION
The 1-Wire bus has only a single line by definition; it is important that each device on the bus be able to
drive it at the appropriate time. To facilitate this, each device attached to the 1-Wire bus must have open
drain or 3-state outputs. The 1-Wire port of the DS1920 (data contact) is open drain with an internal
circuit equivalent to that shown in Figure 8. A multidrop bus consists of a 1-Wire bus with multiple
slaves attached. The 1-Wire bus requires a pull up resistor of approximately 5 k
. The idle state for the 1-
Wire bus is high. If for any reason a transaction needs to be suspended, the bus MUST be left in the idle
state if the transaction is to resume. If this does not occur and the bus is left low for more than 120 ms,
one or more of the devices on the bus will be reset.
HARDWARE CONFIGURATION
Figure 8
TRANSACTION SEQUENCE
The protocol for accessing the DS1920 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 DS1920 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 pulse, it can issue one of the five ROM function commands.
All ROM function commands are eight bits long. A list of these commands follows (refer to flowchart in
Figure 5):
相關(guān)PDF資料
PDF描述
DS1920-F3 Temperature iButton
DS1921 High-Resolution Thermochron iButton
DS1921H-F5 High-Resolution Thermochron iButton
DS1921Z-F5 High-Resolution Thermochron iButton
DS1963L-F5 NVRAM (Battery Based)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1920+F5 制造商:Maxim Integrated Products 功能描述:TEMP IBTN 2PIN F5 MICROCAN - Rail/Tube
DS1920-F3 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Temperature iButton
DS1920-F5 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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
DS1920-F5+ 功能描述:iButton Temperature iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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
DS1921 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Resolution Thermochron iButton
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