參數(shù)資料
型號(hào)： DS1922L
英文描述： Temperature Logger iButton with 8kB Datalog Memory
文件頁(yè)數(shù)： 23/48頁(yè)
文件大?。?/td> 428K
代理商： DS1922L
DS1922L/DS1922T
23 of 48
The Full Access Password needs to be transmitted exactly in the sequence FP0, FP1… FP62, FP63. It will affect
the functions “Read Memory with CRC”, “Copy Scratchpad”, “Clear Memory”, “Start Mission”, and “Stop Mission”.
The DS1922L/T executes the command only if the password transmitted by the master was correct or if password
checking is not enabled
Due to the special behavior of the write access logic, the Password Control Register and both passwords must be
written at the same time. When setting up new passwords, always verify (read back) the scratchpad before sending
the copy scratchpad command. After a new password is successfully copied from the scratchpad to its memory
location, erase the scratchpad by filling it with new data (write scratchpad command). Otherwise a copy of the
passwords will remain in the scratchpad for public read access.
DATALOG MEMORY USAGE
Once setup for a mission, the DS1922L/T logs the temperature measurements at equidistant time points entry after
entry in its datalog memory. The datalog memory is able to store 8192 entries in 8-bit format or 4096 entries in 16-
bit format (Figure 7). In 16-bit format, the higher 8 bits of an entry are stored at the lower address. Knowing the
starting time point (Mission Time Stamp) and the interval between temperature measurements one can reconstruct
the time and date of each measurement.
There are two alternatives to the way the DS1922L/T will behave after the datalog memory is filled with data. The
user can program the device to either stop any further recording (disable “rollover”) or overwrite the previously
recorded data (enable “rollover”), one entry at a time, starting again at the beginning of the respective memory
section. The contents of the Mission Samples Counter in conjunction with the sample rate and the Mission Time
Stamp will then allow reconstructing the time points of all values stored in the datalog memory. This gives the exact
history over time for the most recent measurements taken. Earlier measurements cannot be reconstructed.
Figure 7. Temperature Logging
ETL = 1
TLFS = 0
8192
8-Bit Entries
Temperature
4096
16-Bit Entries
Temperature
1000h
2FFFh
1000h
2FFFh
ETL = 1
TLFS = 1
With 16-bit format,
the most-significant
byte is stored at the
lower address.
相關(guān)PDF資料
PDF描述
DS1922T Temperature Logger iButton with 8kB Datalog Memory
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1922L_11 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Temperature Logger iButton with 8KB Data-Log Memory
DS1922L-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
DS1922L-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
DS1922L-F5#A20 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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