參數(shù)資料
型號(hào)： DS1921
英文描述： High-Resolution Thermochron iButton
中文描述： 高分辨率Thermochron iButton的
文件頁(yè)數(shù)： 39/44頁(yè)
文件大?。?/td> 271K
代理商： DS1921
DS1921H/Z
39 of 44
STEP 4
In this example, the temperature alarms are set to 0
°
C for the low temperature threshold and 10
°
C for the
high temperature threshold, assuming it is a DS1921Z device. The sample rate is once every 10 minutes,
allowing the mission to last up to 14 days. This results in the following data to be written to the special
function registers:
Address:
20Bh
20Ch
20Dh
Data:
2Ch
7Ch
0Ah
With only a single DS1921H/Z connected to the bus master, the communication of step 4 is as follows:
MASTER MODE
DATA (LSB FIRST)
TX
(Reset)
RX
(Presence)
TX
CCh
TX
0Fh
TX
0Bh
TX
02h
TX
<3 data bytes>
TX
(Reset)
RX
(Presence)
TX
CCh
TX
AAh
RX
0Bh
RX
02h
RX
0Dh
RX
<3 data bytes>
TX
(Reset)
RX
(Presence)
TX
CCh
TX
55h
TX
0Bh
TX
02h
TX
0Dh
TX
(Reset)
RX
(Presence)
COMMENTS
Reset pulse (480
μ
s to 960
μ
s)
Presence pulse
Issue Skip ROM command
Issue Write Scratchpad command
TA1, beginning offset = 0Bh
TA2, address = 020Bh
Write 3 bytes of data to scratchpad
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Read Scratchpad command
Read TA1, beginning offset = 0Bh
Read TA2, address = 020Bh
Read E/S, ending offset = 0Dh, 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
If step 4 was successful, the MIP bit in the Status Register will be 1, the MEMCLR bit will be 0, and the
mission start delay will be counting down.
相關(guān)PDF資料
PDF描述
DS1921H-F5 High-Resolution Thermochron iButton
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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(chēng):未知廠家 功能描述:Thermochron iButton
DS1921G_11 制造商:MAXIM 制造商全稱(chēng):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(chēng):Maxim Integrated Products 功能描述:Thermochron iButton
DS1921G_12 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:Thermochron iButton
DS1921G-F5 功能描述:iButton RoHS:否 存儲(chǔ)類(lèi)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(lèi)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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