參數(shù)資料
型號： SHT1X
廠商： Electronic Theatre Controls, Inc.
元件分類： 溫度/濕度傳感器
英文描述： Humidity & Temperature Sensor
中文描述： 濕度
文件頁數(shù)： 5/9頁
文件大?。?/td> 485K
代理商： SHT1X
SHT1x / SHT7x Relative Humidity & Temperature Sensor System
www.sensirion.com
v2.01 March 2003
5/9
3 Converting Output to Physical Values
3.1 Relative Humidity
To compensate for the non-linearity of the humidity sensor
and to obtain the full accuracy it is recommended to convert
the readout with the following formula
1
:
c
SO
c
c
RH
+
+
=
2
RH
3
c
2
RH
2
1
linear
SO
RH
12 bit
8 bit
Table 6
SO
c
1
-4
-4
c
3
0.0405
0.648
-2.8 * 10
-6
-7.2 * 10
-4
Humidity conversion coefficients
For simplified, less computation intense conversion formulas
see application note “RH and Temperature Non-Linearity
Compensation”.
The humidity sensor has no significant voltage dependency.
100%
0
500
1000
1500
2000
2500
3000
0%
20%
40%
60%
%
80%
SO
RH
sensor readout (12bit)
Figure 10
Conversion from SO
RH
to relative humidity
3.1.1
For temperatures significantly different from 25 °C (~77 °F)
the temperature coefficient of the RH sensor should be
considered:
SO
t
(t
25)
(T
RH
+
=
°
SO
RH
t
1
t
2
12 bit
0.01
0.00008
8 bit
0.01
0.00128
Table 7
Temperature compensation coefficients
Compensation of RH/Temperature dependency
linear
RH
2
1
C
true
RH
)
+
This equals ~0.12 %RH / °C @ 50 %RH
1
Where SO
RH
is the sensor output for relative humidity
3.2 Temperature
The bandgap PTAT (Proportional To Absolute Temperature)
temperature sensor is very linear by design. Use the
following formula to convert from digital readout to
temperature:
SO
d
d
Temperatur
+
=
T
2
1
d
1
[°f]
-40.00
-39.50
-39.35
-39.28
-39.23
VDD
5V
4V
3.5V
3V
2.5V
Table 8
d
1
[°C]
-40.00
-39.75
-39.66
-39.60
-39.55
Temperature conversion coefficients
SO
T
14bit
12bit
d
2
[°C]
0.01
0.04
d
2
[°f]
0.018
0.072
For improved accuracies in extreme temperatures with more
computation intense conversion formulas see application
note “RH and Temperature Non-Linearity Compensation”.
3.3 Dewpoint
Since humidity and temperature are both measured on the
same monolithic chip, the SHTxx allows superb dewpoint
measurements. See application note “Dewpoint calculation”
for more.
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