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
文件頁數(shù)： 23/44頁
文件大?。?/td> 271K
代理商： DS1921
DS1921H/Z
23 of 44
Mission Start and Logging Process
The DS1921H/Z does not use a special command to start a mission. Instead, a mission is started by
writing a non-zero value to the Sample Rate Register using the Copy Scratchpad command. As shown in
Figure 11, a new mission can only be started if the previous mission has been stopped (MIP = 0), the
memory is cleared (MEMCLR = 1) and the mission is enabled (EM = 0). If the new sample rate is
different from zero, the value will be copied to the sample rate register. At the same time the MIP bit will
be set and the MEMCLR bit will be cleared to indicate that the device is on a mission. Next the Mission
Start Delay counter will start decrementing every minute until it is down to 0. Now the DS1921H/Z will
wait until the next minute boundary and start the logging process, which as its first action copies the
applicable RTC registers to the Mission Time Stamp.
MISSION START AND LOGGING PROCESS
Figure 11
The Mission Start Process is invoked when the Copy Scratchpad function is used to set a new sample rate
by writing to the Sample Rate Register at address 020Dh. One minute after the start delay countdown is
over, the Logging Process begins and the Mission Start Process ends.
Logging Process
DS1921 sets Datalog
Address = 1000h
DS1921 Measures
Temperature
DS1921 Updates His-
togram, Device Sam-
ples Counter, Mission
Samples Counter and
Alarm, if applicable
RO = 1
DS1921 Stores Temp.
at Datalog Address
DS1921 Increments
lower 11 bits of
Datalog Address
DS1921 Stores Temp.
at Datalog Address
DS1921 Increments
Datalog Address
Datalog
Address =
1800h
DS1921 Waits
One Sample
Period
MIP = 1
End of Process
Y
Y
N
N
N
Y
N
DS1921 Copies new
Sample Rate from
Scratchpad to Sample
Rate Register
N
Y
N
Y
N
DS1921 sets MIP = 1;
MEMCLR = 0
MIP = 1
MEMCLR = 1
EM = 0
New Sample
Rate = 0
Start Delay
Counter = 0
Mission Start Process
DS1921 Decrements
Start Delay Counter
DS1921 Waits Until
Next Minute Boundary
DS1921 Copies RTC to
Mission Time Stamp
End of Process
DS1921 Sets MIP = 0
Y
N
Y
Y
N
MIP = 1
Y
DS1921
Logging
Process
DS1921 Waits
Until Next
Minute
Boundary
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: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(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
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