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参数资料
| 型号： | DS1923-F5# |
| 厂商： | Maxim Integrated |
| 文件页数： | 53/55页 |
| 文件大小： | 0K |
| 描述： | IBUTTON TEMP/HUMIDITY LOGGER F5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| RoHS指令信息： | IButton RoHS Compliance Plan |
| 标准包装： | 5 |
| 系列： | iButton® |
| 存储容量： | 512B |
| 存储器类型： | NVSRAM（非易失 SRAM） |
| 产品目录页面： | 1431 (CN2011-ZH PDF) |
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DS1923
iButton Hygrochron Temperature/Humidity
Logger with 8KB Data-Log Memory
RH Temperature Compensation
The data for the software correction of humidity is taken
at 25°C. Since the temperature characteristics of the
humidity sensor are known, humidity readings taken at
other temperatures can be corrected, provided the
temperature at the time of the humidity conversion is
also known. Therefore, to obtain the most accurate
humidity results, both temperature and humidity should
be logged.
Temperature compensation uses the following equation:
HTcorr = (Hcorr x K + α x (T - 25°C)
- β x (T - 25°C) 2 )/(K + γ x (T - 25°C) - δ x (T - 25°C) 2 )
Hcorr is the humidity reading with the software correc-
tion algorithm for humidity already applied, as
explained in the previous section. The function and val-
ues of the other parameters are explained in the table
below.
NAME
T
K
FUNCTION
Temperature at the time of humidity conversion.
Humidity sensor conversion constant.
Linear compensation, enumerator.
Quadratic compensation, enumerator.
Linear compensation, denominator.
Quadratic compensation, denominator.
(in °C)
0.0307
0.0035/°C
0.000043/°C 2
>15°C: 0.00001/°C
15°C: -0.00005/°C
0.000002/°C 2
VALUE
Numerical RH Temperature Compensation Example
SAMPLE INPUT DATA
T = 70°C
Hcorr = 24.445%RH
APPLICATION OF CORRECTION COEFFICIENTS TO SAMPLE READING
= 0.00001/°C
HTcorr = (24.445 x 0.0307 + 0.0035 x 45 - 0.000043 x 45 2 )/(0.0307 + 0.00001 x 45 - 0.000002 x 45 2 )
HTcorr = 30.291%
N 0 . 0156 × ARH k × 2 . 54 ? 0 . 3502 × k
1 + ( T k ? 25 ) / 100
Software Saturation Drift
Compensation
Capacitive humidity sensors read higher humidity val-
ues than the actual humidity level when they are
exposed to a high-humidity environment for an extend-
ed time period. The DS1923 ’s humidity sensor pro-
duces readings that are higher than the actual humidity
when exposed to humidity levels of about 70%RH and
higher. This shift continues to increase while the device
remains at 70%RH and above. This effect is called sat-
uration drift, or hysteresis. This drift is reversible.
Readings return to their regular level when the DS1923
is removed from a high-humidity environment.
It is possible to compensate for most of the error intro-
duced by the saturation drift by post-processing tem-
perature and humidity logs using the equation below,
which is based on laboratory tests and curve-fitting
techniques.
Maxim Integrated
HScorr = HTcorr ? ∑
k = 1
ARH k The average software-corrected and tempera-
ture-compensated humidity reading of the k th
hour that the device is continuously exposed
to 70%RH or higher.
T k The average software-corrected temperature
reading of the k th hour that the device is
continuously exposed to 70%RH or higher.
N The number of hours that the device is contin-
uously exposed to 70%RH or higher.
HTcorr The humidity reading at the end of the N th
hour with the software correction algorithm for
humidity and temperature compensation
already applied. See the Software Correction
Algorithm for Humidity and RH Temperature
Compensation sections for details.
The numbers in the equation are derived from curve fit-
ting. They apply to a time scale in hours.
53
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相关代理商/技术参数 |
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| DS1923-F5# | 功能描述:iButton Hygrochron Temp/Hum Logger w/8KB DataLog RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1923-F5#W | 功能描述:iButton Hygrochron Temp/Hum Logger w/8KB DataLog RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1923-F5+ | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS19310 | 制造商:SANYO 制造商全称: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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