HTG3515CH Measurement Specialties Inc/MEAS France, HTG3515CH Datasheet - Page 6

• Manufacturer Part Number: HTG3515CH
• Description: VOUT RH/ TEMP MODULE, SIDE CONN
• Manufacturer: Measurement Specialties Inc/MEAS France

Specifications of HTG3515CH

• Output Type: Analog Voltage, NTC Thermistor
• Sensor Type: Humidity and Temperature
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

HTG3500 Series - Relative Humidity and Temperature Module
•
According to the equation below, the Steinhart-Hart coefficients for the operating temperature range for
HTG3500 products thermistor are:
•
Concerning the temperature sensor of the HTG3500 Series products, the following measuring method described
below is based on a voltage bridge divider circuit. It uses only one resistor component (Rbatch) at 1% to design
HTM2500 temperature sensor interfacing circuit.
Rbatch is chosen to be equal to NTC @25°C to get: Vout = Vcc/2 @25°C.
The proposal method connects Rbatch to Vcc (5Vdc) and NTC to Ground. It leads to a negative slope
characteristic (Pull-Up Configuration).
HTG3500 Series HPC123_G
Steinhart-Hart coefficients
Temperature Interface circuit
V
OUT
HTG3500 NTC
(
10k @25°C
mV
)
=
Vcc
R
VCC (mV)
batch
(
mV
(
Ω
)
Rbatch
10k
* )
+
NTC
NTC
R
T
a
b
c
T
1
Vout (mV)
=
HTG
HTG
a
W1
Ground
W3
NTC Resistance output
+
3500
3500
NTC resistance in Ω at temperature T in K
Temperature in K
Constant value (a= 8.61393E-04)
Constant value (b= 2.56377E-04)
Constant value (c= 1.68055E-07)
b
*
(
(
Ω
Ω
ln(
)
)
www.meas-spec.com
R
)
+
C
6/10
*
ln(
R
* )
Temperature Resistance Pull-Up Configuration
ln(
R
(°C)
100
110
-40
-30
-20
-10
10
20
25
30
40
50
60
70
80
90
* )
0
ln(
R
)
195652
113347
68237
42506
27219
17926
12081
10000
8315
5834
4161
3014
2228
1669
1268
974
758
(Ω)
Vout (mV)
4757
4595
4361
4048
3657
3210
2736
2500
2270
1842
1469
1158
911
665
563
444
352
January 2010