HTS2030SMD – Temperature and Relative Humidity Sensor
•
•
•
•
•
Miniature Surface mount SMD package
Lead free component
Patented solid polymer structure
Suitable for linear voltage or frequency output
circuitry
Fast response time and very low temperature
coefficient
DESCRIPTION
Based on a unique
capacitive cell for humidity
measurement and a
Negative Temperature Coefficient
(NTC)
thermistor for temperature measurement, this dual-purpose relative humidity / temperature miniaturized
sensor is designed for high volume,
cost sensitive applications with tight space constraints.
It is useful in all
applications where
dew point, absolute humidity measurements
or humidity compensation are required.
FEATURES
•
•
•
•
•
Fulll interchangeability with no calibration
required in standard conditions
Instantaneous desaturation after long periods in
saturation phase
Compatible with automatized assembly
processes, including Pb free wave soldering
(1)
and reflow processes
Individual marking for compliance to stringent
traceability requirements
Part may be washed with distilled water
(1)
APPLICATIONS
•
•
•
•
Automotive
Home Appliance
Printers
Meteorology
Soldering temperature profiles available on request / contact us at
humidity.application@meas-spec.com
PERFORMANCE SPECS
MAXIMUM RATINGS
Ratings
Operating Temperature
Storage Temperature
Supply Voltage (Peak)
Humidity Operating Range
Symbol
Ta
Tstg
Vs
RH
Value
-60 to 140
-60 to 140
10
0 to 100
Unit
°
C
°
C
Vac
% RH
Peak conditions:
less than 10% of the operating time.
HTS2030SMD HPC055_H
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October 2012
HTS2030SMD – Temperature and Relative Humidity Sensor
ELECTRICAL CHARACTERISTICS
(Ta=25° measurement frequency @10kHz unless othe rwise noted)
C,
Humidity Characteristics
Humidity Measuring Range
Supply Voltage
(1)
Nominal Capacitance @55%RH
Temperature coefficient
Average Sensitivity from 33% to 75%RH
Leakage Current (Vcc=5V)
Recovery time after 150 hours of condensation
Humidity Hysteresis
Long Term Stability
Time Constant (at 63% of signal, still air) 33%RH to 80%RH
Deviation to typical response curve (10% RH to 90%RH)
(1)
Tighter specification available on request
Symbol
RH
Vs
C
T
cc
∆C/%RH
I
tr
T
τ
Min
1
177
Typ
180
0.31
Max
99
10
183
0.01
1
10
+/-1
+/-0.5
3
+/-2
Min
3600
-60
Typ
10
3730
2
3
10
5
Unit
%RH
V
pF
pF/°C
pF/%RH
nA
s
%RH
%RH/yr
s
%RH
Unit
k
°
C
%
%
s
Temperature Characteristics
Nominal Resistance @25°
C
Beta value: B25/100
Temperature Measuring Range
Nominal Resistance Tolerance @25°
C
Beta Value Tolerance
Response Time
Symbol
R
β
Ta
R
N
β
τ
Max
3800
140
3
TYPICAL PERFORMANCE CURVES
HUMIDITY SENSOR
•
Polynomial Response
C (pF)=C@55 %*( 3.903 10
-8
*RH
3
-8.294 10
-6
*RH
2
+2.188 10
-3
*RH+0.898)
HTS2030SMD HPC055_H
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2/9
October 2012
HTS2030SMD – Temperature and Relative Humidity Sensor
•
Typical Response Look-Up Table (polynomial reference curve) @10kHz/1V
RH (%)
Cp (pF)
RH (%)
Cp (pF)
0
161.6
55
180
5
163.6
60
181.4
10
165.4
65
182.9
15
167.2
70
184.3
20
169.0
75
185.7
25
170.7
80
187.2
30
172.3
85
188.6
35
173.9
90
190.1
40
175.5
95
191.6
45
177.0
100
193.1
50
178.5
•
Reverse Polynomial Response
RH (%) = -3.4656 10
+3
*X
3
+1.0732 10
+4
*X
2
-1.0457 10
+4
*X+3.2459 10
+3
With X = C(read) / C@55%RH
TEMPERATURE SENSOR
•
Typical Temperature Output
Depending on the needed temperature measurement range and associated accuracy, we suggest two methods
to access to the NTC resistance values.
R
T
=
R
N
×
e
R
T
R
N
T, T
N
β
e
β
−
1 1
T T
N
NTC resistance in at temperature T in K
NTC resistance in at rated temperature T in K
Temperature in K
Beta value, material specific constant of NTC
Base of natural logarithm (e=2.71828)
The exponential relation only roughly describes the actual characteristic of an NTC thermistor can, however,
as the material parameter
β
in reality also depend on temperature. So this approach is suitable for describing a
restricted range around the rated temperature or resistance with sufficient accuracy.
For practical applications, a more precise description of the real R/T curve may be required. Either more
complicated approaches (e.g. the Steinhart-Hart equation) are used or the resistance/temperature relation as
given in tabulation form. The below table has been experimentally determined with utmost accuracy for
temperature increments of 1 degree.
Actual values may also be influenced by inherent self-heating properties of NTCs. Please refer to MEAS-
France/Humirel Application Note HPC106 “Low power NTC measurement”.
HTS2030SMD HPC055_H
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3/9
October 2012
HTS2030SMD – Temperature and Relative Humidity Sensor
•
Temperature look-up table
Rout
( )
262960
247217
232539
218845
206064
194110
182852
172332
162498
153299
144790
136664
129054
121925
115243
109030
103115
97565
92354
87460
82923
78581
74497
70655
67039
63591
60381
57356
54503
51813
49204
46767
44467
42296
40247
38279
36455
34731
33100
31557
Max Dev
( )
35403
32777
30358
28130
26075
24178
22416
20791
19290
17905
16636
15444
14343
13325
12383
11516
10705
9953
9257
8612
8020
7463
6947
6468
6023
5606
5222
4865
4533
4225
3932
3662
3411
3177
2960
2756
2568
2393
2230
2078
Temp
(°
C)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Rout
( )
30029
28627
27299
26042
24852
23773
22708
21698
20739
19829
18959
18128
17338
16588
15876
15207
14569
13962
13384
12834
12280
11777
11297
10840
10404
10000
9600
9218
8853
8506
8178
7866
7568
7283
7011
6734
6484
6244
6015
5796
Max Dev
( )
1932
1799
1675
1560
1452
1355
1261
1174
1093
1017
946
879
817
759
705
654
607
563
522
484
447
413
382
353
325
300
300
300
299
297
296
294
292
290
287
284
281
278
275
271
Temp
(°C)
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
Rout
( )
5575
5373
5180
4995
4817
4636
4473
4316
4166
4021
3874
3737
3606
3481
3360
3237
3126
3019
2917
2819
2720
2629
2542
2458
2378
2304
2229
2158
2089
2022
1960
1898
1839
1782
1727
1673
1622
1573
1526
1480
Max Dev
( )
267
264
260
257
253
248
245
241
237
233
229
225
221
217
213
208
204
200
197
193
189
185
182
178
175
171
168
165
161
158
155
152
149
146
143
140
138
135
132
130
Temp
(°
C)
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
Rout
( )
1432
1390
1349
1310
1272
1235
1199
1163
1130
1097
1067
1038
1009
982
955
927
901
877
853
830
Max Dev
( )
127
124
122
119
117
115
112
110
108
106
104
102
100
98
96
94
92
90
89
87
Temp
(°
C)
-40
-39
-38
-37
-36
-35
-34
-33
-32
-31
-30
-29
-28
-27
-26
-25
-24
-23
-22
-21
-20
-19
-18
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
HTS2030SMD HPC055_H
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4/9
October 2012
HTS2030SMD – Temperature and Relative Humidity Sensor
•
Steinhart-Hart coefficients
According to the equation below, the Steinhart-Hart coefficients for the operating temperature range for
HTS2030SMD thermistor are:
1
=
a
+
b
* ln(
R
)
+
C
* ln(
R
) * ln(
R
) * ln(
R
)
T
R
T
a
b
c
•
Temperature Interface circuit
NTC resistance in at temperature T in K
Temperature in K
Constant value (a= 9.94805E-04)
Constant value (b= 2.46791E-04)
Constant value (c= 1.10298E-07)
Concerning the temperature sensor of the HTS2030SMD, 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
HTS2230 temperature sensor interfacing circuit. Rbatch is chosen to be equal to NTC @25° to get: Vout =
C
Vcc/2 @25° There are two proposal configurations: If Rbatch is connected to Vcc and NTC to Ground, it leads
C.
to a negative slope characteristic (Pull-Down Configuration). For a positive slope, Rbatch and NTC resistors
have to be switched (Pull-Up Configuration).
Pull-Up Configuration
VCC (mV)
Pull-Down Configuration
VCC (mV)
Rbatch
10k
HTS2030SMD
NTC 10k @25°C
HTS2030SMD
NTC 10k @25°
C
Vout (mV)
Rbatch
10k
Vout (mV)
V
OUT
(
mV
)
=
Vcc
(
mV
) *
NTC
HTS
2030
SMD
(
Ω
)
R
batch
(
Ω
)
+
NTC
HTS
2030
SMD
(
Ω
)
V
OUT
(
mV
)
=
Vcc
(
mV
) *
R
batch
(
Ω
)
R
batch
(
Ω
)
+
NTC
HTS
2030
SMD
(
Ω
)
HTS2030SMD HPC055_H
www.meas-spec.com
5/9
October 2012
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