參數(shù)資料
型號(hào)： DS1923
英文描述： Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
文件頁數(shù)： 17/52頁
文件大小： 495K
代理商： DS1923
DS1923: Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
Latest Humidity Conversion Result Register Bitmap
17 of 52
ADDR
020Eh
020Fh
b7
H3
H11
b6
H2
H10
b5
H1
H9
b4
H0
H8
b3
X
H7
b2
X
H6
b1
X
H5
b0
X
H4
HRL
HRH
During a mission, if humidity logging is enabled, the HRH byte (H11 to H4) is always recorded. The HRL byte is
only recorded if the DS1923 is set up for 16-bit humidity logging. The logging mode (8-bit or 16-bit) is selected
through the HLFS bit at the Mission Control Register, address 0213h.
With HRH and HRL representing the decimal equivalent of a humidity reading the actual humidity is calculated
according to the algorithms shown in the table below.
16-Bit Mode, HLFS = 1
8-Bit Mode, HLFS = 0
IVAL = (HRH * 256 + HRL)/16
Round IVAL
down
to the nearest integer; this eli-
minates the undefined 4 bits of HRL.
(N/A)
ADVAL = IVAL*5.02/4096
ADVAL = HRH*5.02/256
HUMIDITY(%RH) = (ADVAL - 0.958)/0.0307
The result is a raw humidity reading that needs to be corrected to achieve the specified accuracy. See the
Software
Correction Algorithm for Humidity
section for further details.
To specify the humidity alarm thresholds, the equation needs to be resolved to:
ADVAL = HUMIDITY(%RH) * 0.0307 + 0.958
HALM = ADVAL * 256/5.02
Round HALM to the nearest integer.
The HALM value needs to be converted into hexadecimal before it can be written to one of the humidity alarm
threshold registers (
Low Alarm address 020Ah; High Alarm address 020B
). Independent of the conversion
mode (8-or 16-bit) only the most significant byte of a humidity conversion is used to determine whether an alarm
will be generated. The alarm thresholds are applied to the raw humidity readings. Therefore, if software correction
is used, the effect of the software correction is to be reversed before calculating a humidity alarm threshold.
Example
: let the desired alarm threshold be 60%RH. The 60% threshold may correspond to a raw reading of
65%RH (i.e., before correction). To set a 60%RH (after correction) threshold, the HALM value then needs to be
calculated for 65%RH.
Humidity Conversion Examples
Mode
HRH
decimal
B5h
67h
B5h
67h
hex
HRL
decimal
hex
Humidity(%RH)
8-bit
8-bit
16-bit
16-bit
181
103
181
103
84.41
34.59
84.89
34.70
C0h
30h
12
48
Humidity Alarm Threshold Examples
Humidity(%RH)
HALM
decimal
97h
58h
hex
65
25
151
88
These examples do not include the effects of software correction.
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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(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 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
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