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)： 36/44頁
文件大小： 271K
代理商： DS1921
DS1921H/Z
36 of 44
MISSION EXAMPLE: PREPARE AND START A NEW MISSION
Assumption: The previous mission has come to an end. To end an ongoing mission write the MIP bit in
the Status Register to 0.
The preparation of a DS1921H/Z for a mission including the start of the mission requires up to four steps:
Step 1: set the RTC (if it needs to be adjusted)
Step 2: clear the data of the previous mission
Step 3: set the search condition and mission start delay, clear alarm flags
Step 4: set the temperature alarms and write the sample rate to start the mission
STEP 1
Let the actual time be 15:30:00 hours on Monday, the 1
st
of April in 2002. This results in the following
data to be written to the RTC registers:
Address:
200h
201h
202h
Data:
00h
30h
15h
With only a single DS1921H/Z connected to the bus master, the communication of step 1 is as follows:
MASTER MODE
DATA (LSB FIRST)
TX
(Reset)
RX
(Presence)
TX
CCh
TX
0Fh
TX
00h
TX
02h
TX
<7 data bytes>
TX
(Reset)
RX
(Presence)
TX
CCh
TX
AAh
RX
00h
RX
02h
RX
06h
RX
<7 data bytes>
TX
(Reset)
RX
(Presence)
TX
CCh
TX
55h
TX
00h
TX
02h
TX
06h
TX
(Reset)
RX
(Presence)
203h
01h
204h
81h
205h
04h
206h
02h
COMMENTS
Reset pulse (480
μ
s to 960
μ
s)
Presence pulse
Issue Skip ROM command
Issue Write Scratchpad command
TA1, beginning offset = 00h
TA2, address = 0200h
Write 7 bytes of data to scratchpad
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Read Scratchpad command
Read TA1, beginning offset = 00h
Read TA2, address = 0200h
Read E/S, ending offset = 6h, flags = 0h
Read scratchpad data and verify
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Copy Scratchpad command
TA1
TA2
(AUTHORIZATION CODE)
E/S
Reset pulse
Presence pulse
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相關(guān)代理商/技術(shù)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
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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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