HTM1735LF – Temperature and Relative Humidity Module
•
Suitable for direct board assembly
•
Product free from Lead, Cr (6+), Cd and Hg
•
Humidity calibrated within +/- 2% RH @ 55% RH
•
Typical 1 to 3.6 Volt DC output for 0 to 100% RH at
5V DC supply
•
Temperature measurement through NTC 10 kΩ +/3% direct output
DESCRIPTION
Based on the rugged HS1101LF humidity sensor, HTM1735LF is a dedicated humidity and temperature
transducer designed for OEM applications where a reliable and accurate measurement is needed. Direct
interface with a micro-controller is made possible with the module’s humidity linear voltage and direct NTC
outputs. HTM1735LF is designed for an optimized board to board connection.
FEATURES
APPLICATIONS
•
Full interchangeability
•
Reprography
•
High reliability and long term stability
•
HVAC Controller
•
Not affected by repeated condensations
…
•
Ratiometric to voltage supply within the
specified range
PERFORMANCE SPECS
MAXIMUM RATINGS
Ratings
Storage Temperature
Storage Humidity
Supply Voltage (Peak)
Humidity Operating Range
Temperature Operating Range
Maximum Output Current (Peak)
Maximum Power
HTM1735LF HPC035_K
Symbol
Value
Unit
Tstg
-40 to 105
°C
RHstg
0 to 100
% RH
Vs
RH
Ta
IPeak
Pd
7
0 to 100
-40 to 100
5
20
Vdc
% RH
°C
mA
mW
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May 2008
HTM1735LF – Temperature and Relative Humidity Module
ELECTRICAL CHARACTERISTICS
(Ta=25°C, Vs=5Vdc, RL>1MΩ unless otherwise stated)
Humidity Characteristics
Humidity Measuring Range
Relative Humidity Accuracy (10 to 95% RH)
Supply Voltage
Nominal Output @55%RH (at 5Vdc)
Current Consumption
Temperature Coefficient (10 to 50°C)
Average Sensitivity from 33% to 75%RH
Sink Current Capability (RL = 33kΩ)
Recovery Time after 150 hours of condensation
Humidity Hysteresis
Humidity Resolution
Long Term Stability
(1)
Time Constant (at 63% of signal, static) 33% to 75%RH
Output Impedance
Warm Up Time
(1)
Symbol
RH
RH
Vs
Vout
Ic
Tcc
ΔVout/ΔRH
I
tr
Min
0
4.75
2.42
Typ
+/-3
5.00
2.48
2.8
-0.05
+26
Max
100
+/-5
5.25
2.54
4
-0.1
150
10
+/-1
0.4
+/-0.5
5
70
200
T
τ
Z
tW
10
Unit
%RH
%RH
Vdc
V
mA
%RH/°C
mV/%RH
µA
s
%RH
%RH
%RH/yr
s
Ω
ms
At 2m/s air flow
(Ta=25°C)
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
RN
β
τ
Min
3600
-30
Typ
10
3730
2
3
10
Max
3800
80
3
Unit
kΩ
°C
%
%
s
TYPICAL PERFORMANCE CURVES
HUMIDITY SENSOR
•
Measurement Conditions
HTM1735LF
is
specified
for
measurements within 10 to 95 %RH.
accurate
Excursion out of this range (< 10% or > 95% RH,
including condensation) does not affect the
reliability of HTM1735LF characteristics
HTM1735LF HPC035_K
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May 2008
HTM1735LF – Temperature and Relative Humidity Module
•
HTM1735LF Modeled Linear Voltage Output (Vcc=5V)
RH (%)
10
15
20
25
30
35
40
45
50
Output Voltage (mV)
4000
LINEAR EQUATION
3000
2000
1000
0
10
20
30
40
50
60
70
80
90
Vout (mV)
1325
1465
1600
1735
1860
1990
2110
2235
2360
RH (%)
55
60
65
70
75
80
85
90
95
Vout (mV)
2480
2605
2730
2860
2990
3125
3260
3405
3555
100
Relative Humidity (%)
LINEAR EQUATION:
ƒ Vout = 25.68RH + 1079
ƒ RH = 0.03892 Vout – 41.98
(With Vout in mV and RH in %)
•
Error Budget Conditions
•
Linearity Error
HTM1735LF HPC035_K
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May 2008
HTM1735LF – Temperature and Relative Humidity Module
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.
RT = RN × e
RT
RN
T, TN
β
e
⎛1 1 ⎞
⎟⎟
⎝ T TN ⎠
β ⎜⎜ −
NTC resistance in Ω at temperature T in K
NTC resistance in Ω at rated temperature T in K
Temperature in K
Beta value, material specific constant of NTC
Base of natural logarithm (e=2.71828)
c 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.
d 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
Application Note HPC106 “Low power NTC measurement”.
•
Temperature look-up table
Temp
(°C)
Resistance
(Ω)
-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
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
Max Deviation
(Ω)
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
HTM1735LF HPC035_K
Temp
(°C)
Resistance
(Ω)
-2
-1
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
33100
31557
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
Max Deviation
(Ω)
2230
2078
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
Temp
(°C)
Resistance
(Ω)
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
9600
9218
8853
8506
8178
7866
7568
7283
7011
6734
6484
6244
6015
5796
5575
5373
5180
4995
4817
4636
4473
4316
4166
4021
3874
3737
3606
3481
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Max Deviation
(Ω)
300
300
299
297
296
294
292
290
287
284
281
278
275
271
267
264
260
257
253
248
245
241
237
233
229
225
221
217
Temp
(°C)
Resistance
(Ω)
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
80
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
1432
Max Deviation
(Ω)
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
127
May 2008
HTM1735LF – Temperature and Relative Humidity Module
QUALIFICATION PROCESS
RESISTANCE TO PHYSICAL AND CHEMICAL STRESSES
•
•
•
•
HTM1735LFhas passed through qualification processes of MEAS-France including vibration, shock,
storage, high temperature and humidity.
HTM1735LF contains circuit to protect its inputs and outputs against ElectroStatic Discharges (ESD) up to
±15kV, air discharge.
Additional tests under harsh chemical conditions demonstrate good operation in presence of salt
atmosphere, SO2 (0.5%), H2S (0.5%), 03, NOx, NO, CO, CO2, Softener, Soap, Toluene, acids (H2SO4,
HNO3, HCI), HMDS, Insecticide, Cigarette smoke, this is not an exhaustive list.
HTM1735LF is not light sensitive.
SPECIFIC PRECAUTIONS
•
HTM1735LF is not protected against reversed polarity - Check carefully when connecting the device.
PACKAGE OUTLINE
PINOUT ASSIGNMENT
Pin
1
2
3
4
Function
NTC – Temperature
Ground
Vcc – Voltage supply
Vout – Humidity
HTM1735LF STD PACKAGE OUTLINE
Footprint Outline
Package Outline
Dim
Min (mm)
A
34
B
12.5
Max (mm)
Dim
Min (mm)
Max (mm)
36
A
34
36
13.5
B
12.5
D
13.5
5.08 Typ
C
30.25 Typ
D
5.08 Typ
F
2.36 Typ
E
13.1 Typ
G
3.94 Typ
H
Ø 1.02 Typ
3D View
HTM1735LF HPC035_K
Footprint (Top View)
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May 2008
HTM1735LF – Temperature and Relative Humidity Module
HTM1735LF SMD PACKAGE OUTLINE
Package Outline
Dim
Min (mm)
Footprint Outline
Max (mm)
Dim
Min (mm)
Max (mm)
A
34
36
F
27.81Typ
B
12.5
13.5
G
1.27 Typ
C
30.25 Typ
H
3.33 Typ
D
5.08 Typ
J
2.04 Typ
E
6.65 Typ
K
3.18 Typ
3D View
Footprint (Top View)
HTM1735LF SR PACKAGE OUTLINE
3D View
Package Outline
Dim
Min (mm)
Max (mm)
A
34
36
B
12.5
13.5
C
30.25 Typ
D
5.08 Typ
E
6.65 Typ
HTM1735LF HPC035_K
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May 2008
HTM1735LF – Temperature and Relative Humidity Module
ORDERING INFORMATION
HPP805D033: HTM1735LF STD (THROUGH HOLE BOARD-TO-BOARD CONNECTION)
HPP805D034: HTM1735LF SR (WITH HOLES FOR CUSTOMIZED WIRING)
HPP805035: HTM1735LF SMD (SMD BOARD-TO-BOARD CONNECTION)
Customer Service contact details
Measurement Specialties, Inc.
105 av. du Général Eisenhower
BP 23705 31037 TOULOUSE CEDEX 1
FRANCE
Tél: +33 (0) 561 194 848
Fax:+33 (0) 561 194 553
Sales: humidity.sales@meas-spec.com
Revision
K
Comments
Standardized datasheet format
Who
D.LE GALL
Date
May 08
The information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsibility is assumed for
inaccuracies. Furthermore, this information does not convey to the purchaser of such devices any license under the patent rights to the
manufacturer. Measurement Specialties, Inc. reserves the right to make changes without further notice to any product herein. Measurement
Specialties, Inc. makes no warranty, representation or guarantee regarding the suitability of its product for any particular purpose, nor does
Measurement Specialties, Inc. assume any liability arising out of the application or use of any product or circuit and specifically disclaims
any and all liability, including without limitation consequential or incidental damages. Typical parameters can and do vary in different
applications. All operating parameters must be validated for each customer application by customer’s technical experts. Measurement
Specialties, Inc. does not convey any license under its patent rights nor the rights of others.
HTM1735LF HPC035_K
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May 2008