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參數(shù)資料
| 型號： | DS1923 |
| 英文描述： | Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory |
| 文件頁數(shù)： | 16/52頁 |
| 文件大?。?/td> | 495K |
| 代理商： | DS1923 |
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DS1923: Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
Latest Temperature Conversion Result Register Bitmap
16 of 52
ADDR
020Ch
020Dh
b7
T2
T10
b6
T1
T9
b5
T0
T8
b4
0
T7
b3
0
T6
b2
0
T5
b1
0
T4
b0
0
T3
TRL
TRH
With TRH and TRL representing the decimal equivalent of a temperature reading the temperature value is
calculated as
(°C) = TRH/2 - 41 + TRL/512
(16-bit mode, TLFS = 1, see address 0213h)
(°C) = TRH/2 - 41
(8-bit mode, TLFS = 0, see address 0213h)
This equation is valid for converting temperature readings stored in the data log memory as well as for data read
from the Latest Temperature Conversion Result Register.
To specify the temperature alarm thresholds, the equation above needs to be resolved to
TALM = 2 * (°C) + 82
Since the temperature alarm threshold is only one byte, the resolution or temperature increment is limited to 0.5°C.
The TALM value needs to be converted into hexadecimal format before it can be written to one of the temperature
alarm threshold registers (
Low Alarm address 0208h; High Alarm address 0209h
). Independent of the
conversion mode (8- or 16-bit) only the most significant byte of a temperature conversion is used to determine
whether an alarm is generated.
Temperature Conversion Examples
Mode
TRH
decimal
54h
17h
54h
17h
hex
TRL
decimal
hex
(°C)
8-bit
8-bit
16-bit
16-bit
84
23
84
23
29.3125
1.0
-29.5
1.000
00h
60h
0
96
Temperature Alarm Threshold Examples
(°C)
TALM
decimal
85h
3Eh
hex
25.5
-10.0
133
62
HUMIDITY CONVERSION
In addition to temperature, the DS1923 can log humidity data in 8-bit or 16-bit format. Humidity values are
represented as 8- or 16-bit unsigned binary numbers with a resolution of 0.64%RH in the 8-bit mode and 0.04
%RH in the 16-bit mode.
The DS1923 reads data from its humidity sensor whenever a Forced Conversion command is executed (see
Memory/Control Function Commands
) or during a mission, if the device is set up to log humidity data. Regardless
of its setup, the DS1923 always reads 16 bits from the humidity sensor.
The result of the latest humidity reading
is found at address 020Eh (low byte) and 020Fh (high byte).
The most significant bit read from the humidity
sensor will always be found as H11 at address 020Fh. Due to the 12-bit digital output of the humidity sensor, the
lower 4 bits in 16-bit format are undefined.
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PDF描述 |
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| DS1923-F5 | Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory |
| DS1990 | Serial Number iButton |
| DS1990A | Serial Number iButton |
| DS1990A-F5 | Serial Number iButton |
| DS1994L-F5 | 4kb Plus Time Memory iButton |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1923_1 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory |
| DS1923_11 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Hygrochron Temperature/Humidity Logger |
| DS1923-F5 | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量: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 Hygrochron Temp/Hum Logger w/8KB DataLog RoHS:否 存儲類型:SRAM 存儲容量: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 存儲類型:SRAM 存儲容量: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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