參數(shù)資料
型號(hào)： DS1922T
英文描述： Temperature Logger iButton with 8kB Datalog Memory
文件頁數(shù)： 47/48頁
文件大小： 428K
代理商： DS1922T
DS1922L/DS1922T
47 of 48
STEP 3
Start the new mission.
With only a single device connected to the bus master, the communication of step 3 looks like this:
MASTER MODE
TX
RX
TX
TX
TX
TX
TX
RX
If step 3 was successful, the MIP bit in the General Status Register will be 1, the MEMCLR bit will be 0 and the
mission start delay will count down.
DATA (LSB FIRST)
(Reset)
(Presence)
CCh
CCh
<8 FFh bytes>
FFh
(Reset)
(Presence)
COMMENTS
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “Start Mission” command
Send dummy password
Send dummy byte
Reset pulse
Presence pulse
SOFTWARE CORRECTION ALGORITHM FOR TEMPERATURE
The accuracy of high-resolution temperature conversion results (forced conversion as well as temperature logs)
can be improved through a correction algorithm. The data needed for this software correction is stored in the
calibration memory (memory page 18, duplicated in page 19). It consists of reference temperature (Tr) and conver-
sion result (Tc) for two different temperatures, as shown below. See section
Temperature Conversion
for the binary
number format.
ADDRESS
0240h
0241h
0242h
0243h
0244h
0245h
0246h
0247h
DESIGNATOR
Tr2H
Tr2L
Tc2H
Tc2L
Tr3H
Tr3L
Tc3H
Tc3L
DESCRIPTION
Cold reference temperature, high-byte
Cold reference temperature, low-byte
Conversion result at cold reference temperature, high-byte
Conversion result at cold reference temperature, low-byte
Hot reference temperature, high-byte
Hot reference temperature, low-byte
Conversion result at hot reference temperature, high-byte
Conversion result at hot reference temperature, low-byte
The software correction algorithm requires two additional values, which are not stored in the device. These values,
Tr1 and Offset, are derived from the Device Configuration Byte.
The correction algorithm consists of two steps, preparation and execution. By means of the family code the
preparation step verifies whether the device actually is a DS1922. Then the configuration byte is checked to identify
the type of DS1922 (L or T). If it is the right device, the data for software correction is read and converted from
binary to decimal °C format. Next three coefficients A, B, and C are computed. In the execution step the
temperature reading as delivered by the DS1922 is first converted from the low/high-byte format (TcL, TcH) to °C
(Tc) and then corrected to Tcorr. Once step 1 is performed, the three coefficients can be used repeatedly to correct
any temperature reading and temperature log
of the same device
.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1922T-A1F 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
DS1922T-A1F+ 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
DS1922T-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
DS1922T-F5# 功能描述:iButton Temp Logger Ibutton w/8Kb Datalog Mem 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
DS1922T-F50 制造商:Maxim Integrated Products 功能描述:THERMOCHRON,IBTN,F5,HI-TEMP,8K - Rail/Tube
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