參數(shù)資料
型號(hào)： DS1923-F5
英文描述： Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
中文描述： Hygrochron溫度/濕度記錄儀與8KB數(shù)據(jù)記錄存儲(chǔ)器iButton的
文件頁(yè)數(shù)： 26/52頁(yè)
文件大?。?/td> 495K
代理商： DS1923-F5
DS1923: Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
and/or high-threshold. This will make the device respond to a Conditional Search command (see
ROM Function
Commands
), provided that an alarming condition has been encountered.
The setting of the RO bit (rollover enable) and sample rate depends on the duration of the mission and the
monitoring requirements. If the most recently logged data is important, the rollover should be enabled (RO = 1).
Otherwise one should estimate the duration of the mission in minutes and divide the number by 8192 (single
channel 8-bit format) or 4096 (single channel 16-bit format, two channels 8-bit format) or 2048 (two channels 16-bit
format) or 2560 (two channels, one 8-bit and one 16-bit format) to calculate the value of the sample rate (number of
minutes between conversions). If the estimated duration of a mission is 10 days (= 14400 minutes), for example,
then the 8192-byte capacity of the data log memory would be sufficient to store a new 8-bit value every 1.8 minutes
(110 seconds). If the data log memory of the DS1923 is not large enough to store all readings, one can use several
devices and set the Mission Start Delay to values that make the second device start logging as soon as the
memory of the first device is full, and so on. The RO-bit needs to be set to 0 to disable rollover that would
otherwise overwrite the logged data.
After the RO bit and the Mission Start Delay are set, the sample rate needs to be written to the Sample Rate
Register. The sample rate may be any value from 1 to 16383, coded as an unsigned 14-bit binary number.
A
sample rate of all zeros is not valid and must be avoided under all circumstances.
This causes the device to
enter into an unrecoverable state. The fastest sample rate is one sample per second (EHSS = 1, Sample Rate =
0001h) and the slowest is one sample every 273.05 hours (EHSS = 0, Sample Rate = 3FFFh). To get one sample
every 6 minutes, for example, the sample rate value needs to be set to 6 (EHSS = 0) or 360 decimal (equivalent to
0168h at EHSS = 1).
If there is a risk of unauthorized access to the DS1923 or manipulation of data, one should define passwords for
read access and full access. Before the passwords become effective, their use needs to be enabled. See
Security
by Password
for more details.
The last step to begin a mission is to issue the Start Mission command. As soon as it has received this command,
the DS1923 sets the MIP flag and clear the MEMCLR flag. With the immediate/delayed start mode (SUTA = 0),
after as many minutes as specified by the Mission Start Delay are over, the device wakes up, copies the current
date and time to the mission time stamp register, and logs the first entry of the mission. This increments both the
Mission Sample Counter and Device Sample Counter. All subsequent log entries are made as specified by the
value in the Sample Rate Register and the EHSS bit.
If the Start Upon Temperature Alarm mode is chosen (SUTA = 1) and temperature logging is enabled (ETL = 1) the
DS1923 first waist until the start delay is over. Then the device wakes up in intervals as specified by the sample
rate and EHSS bit and measure the temperature. This increments the Device Sample Counter only. The first
sample of the mission is logged when the temperature alarm occurred. However, the Mission Sample Counter will
not increment. One sample period later the Mission Time Stamp is set. From then on, both the Mission Sample
Counter and Device Sample Counter increment at the same time. All subsequent log entries will be made as
specified by the value in the Sample Rate Register and the EHSS bit.
The general-purpose memory operates independently of the other memory sections and is not write-protected
during a mission. All memory of the DS1923 can be read at any time, e. g., to watch the progress of a mission.
Attempts to read the passwords will read 00h bytes instead of the data that is stored in the password registers.
ADDRESS REGISTERS AND TRANSFER STATUS
Because of the serial data transfer, the DS1923 employs three address registers, called TA1, TA2, and E/S (Figure
8). Registers TA1 and TA2 must be loaded with the target address to which the data will be written or from which
data will be sent to the master upon a Read command. Register E/S acts like a byte counter and transfer status
register. It is used to verify data integrity with Write commands. Therefore, the master only has read access to this
register. The lower 5 bits of the E/S Register indicate the address of the last byte that has been written to the
scratchpad. This address is called Ending Offset.
The DS1923 requires that the Ending Offset is always 1Fh for
a Copy Scratchpad to function.
Bit 5 of the E/S Register, called PF or “partial byte flag,” is set if the number of
data bits sent by the master is not an integer multiple of 8. Bit 6 is always a 0. Note that the lowest 5 bits of the
target address also determine the address within the scratchpad, where intermediate storage of data begins. This
address is called byte offset. If the target address for a Write command is 13Ch, for example, then the scratchpad
stores incoming data beginning at the byte offset 1Ch and is full after only 4 bytes. The corresponding ending offset
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1923-F5# 功能描述:iButton Hygrochron Temp/Hum Logger w/8KB DataLog 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
DS1923-F5#W 功能描述:iButton Hygrochron Temp/Hum Logger w/8KB DataLog 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
DS1923-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
DS19310 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Color TV Owners Manual Manuel dinstructions du teleouleur Color TV Manual Del Propietario
DS193-K 制造商:Miyama Electric 功能描述:
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