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)： 13/44頁
文件大?。?/td> 271K
代理商： DS1921
DS1921H/Z
13 of 44
HISTOGRAM BIN AND TEMPERATURE CROSS-REFERENCE
Figure 7
TEMPERATURE
READING
EQUIV. IN °C
EQUIV. IN °C
00h
14.500
01h
14.625
02h
14.750
03h
14.875
04h
15.000
05h
15.125
06h
15.250
07h
15.375
08h
15.500
DS1921H TEMP.
DS1921Z TEMP.
HISTOGRAM BIN
NUMBER
0
0
0
0
1
1
1
1
2
HISTOGRAM BIN
ADDRESS
800h to 801h
800h to 801h
800h to 801h
800h to 801h
802h to 803h
802h to 803h
802h to 803h
802h to 803h
804h to 805h
-5.500
-5.375
-5.250
-5.125
-5.000
-4.875
-4.750
-4.625
-4.500
F7h
F8h
F9h
FAh
FBh
FCh
FDh
FEh
FFh
45.375
45.500
45.625
45.750
45.875
46.000
46.125
46.250
46.375
25.375
25.500
25.625
25.750
25.875
26.000
26.125
26.250
26.375
61
62
62
62
62
63
63
63
63
87Ah to 87Bh
87Ch to 87Dh
87Ch to 87Dh
87Ch to 87Dh
87Ch to 87Dh
87Eh to 87Fh
87Eh to 87Fh
87Eh to 87Fh
87Eh to 87Fh
Since each data bin is 2 bytes it can increment up to 65535 times. Additional measurements for a bin that
has already reached its maximum value will not be counted; the bin counter will remain at its maximum
value. With the fastest sample rate of one sample every minute, a 2-byte bin is sufficient for up to 45 days
if all temperature readings fall into the same bin.
TEMPERATURE ALARM LOGGING
For some applications it may be essential to not only record temperature over time and the temperature
histogram, but also record when
exactly the temperature has exceeded a predefined tolerance band and
for how long
the temperature stayed outside the desirable range. The DS1921H/Z can log high and low
durations. The tolerance band is specified by means of the Temperature Alarm Threshold Registers,
addresses 20Bh and 20Ch in the register page. One can set a high and a low temperature threshold. See
section
Temperature Conversion
for the data format the temperature has to be written in. As long as the
temperature values stay within the tolerance band (i.e., are higher than the low threshold and lower than
the high threshold), the DS1921H/Z will not record any temperature alarm. If the temperature during a
mission reaches or exceeds either threshold, the DS1921H/Z will generate an alarm and set either the
Temperature High Flag (THF) or the Temperature Low Flag (TLF) in the Status Register (address 214h).
This way, if the search conditions (address 20Eh) are set accordingly, the master can quickly identify
devices with temperature alarms by means of the Conditional Search function (see
ROM Function
Commands
). The device also generates a time stamp of when the alarm occurred and begins recording the
duration of the alarming temperature.
Time stamps and durations where the temperature leaves the tolerance band are stored in the address
range 0220h to 027Fh, as shown in Figure 8. This allocation allows recording 24 individual alarm events
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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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