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參數(shù)資料
| 型號(hào)： | HTS2010SMD |
| 廠商： | HUMIREL |
| 英文描述： | TEMPERATURE AND RELATIVE HUMIDITY SENSOR |
| 中文描述： | 溫度和相對(duì)濕度傳感器 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 573K |
| 代理商： | HTS2010SMD |
TECHNICAL
DATA
3
S
UGGESTED EVALUATION CIRCUIT FOR HUMIDITY FREQUENCY
AND TEMPERATURE ANALOG OUTPUTS
Relative humidity (Frequency output)
Soldering instructions
See application note HPC 034 VO
This circuit is a typical Astable design for 555. The HTS2010 is used as a variable capacitor and provides an output fre-
quency modulation with relative humidity ranging from 0% to 100%.
In this frequency output circuit configuration (for capacitance measurement), R1 unbalances the internal temperature com-
pensation scheme of the 555. It shifts the negative initial temperature coefficient of the 555 to a positive one that matches
the humidity sensing chip’s temperature coefficient of - 1.4Hz/°C. In all cases, R1 should be a 1 % resistor with a maximum
of 100ppm temperature coefficient like all other R-C timer resistors.
Resistors values
Since 555 internal temperature compensation changes from manufacturer to manufacturer, R1 and R2 values should be
adapted to device to be used.
Temperature (voltage output)
The temperature measurement is done by a voltage divider, RV2 must be adjusted to get 2.5 V at 25°C as temperature
measurement.
555
R1
R2
TLC555 (Texas)
909k
576k
TS555 (STM)
100nF capacitor
523k
7555 (Harris)
1732k
549k
LMC555 (National)
1238k
562k
For a frequency of 6660Hz at 55%RH
Humirel Sensor Device Data / HPC008 Rev E September 2002
Polarization
In order to get better reproducibility during measurement, always connect pin 4 (see the package outline on page 4) to the
ground of the circuit.
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