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 k +/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 www.meas-spec.com 1/7 May 2008 HTM1735LF - Temperature and Relative Humidity Module ELECTRICAL CHARACTERISTICS (Ta=25C, Vs=5Vdc, RL>1M 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 50C) Average Sensitivity from 33% to 75%RH Sink Current Capability (RL = 33k) 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 Vout/RH 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 Z tW 10 Unit %RH %RH Vdc V mA %RH/C mV/%RH A s %RH %RH %RH/yr s ms At 2m/s air flow (Ta=25C) Temperature Characteristics Nominal Resistance @25C Beta value: B25/100 Temperature Measuring Range Nominal Resistance Tolerance @25C Beta Value Tolerance Response Time Symbol R Ta RN Min 3600 -30 Typ 10 3730 2 3 10 Max 3800 80 3 Unit k 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 www.meas-spec.com 2/7 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: Vout = 25.68RH + 1079 RH = 0.03892 Vout - 41.98 (With Vout in mV and RH in %) * Error Budget Conditions * Linearity Error HTM1735LF HPC035_K www.meas-spec.com 3/7 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 x e RT RN T, TN e 1 1 T TN - 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) c The exponential relation only roughly describes the actual characteristic of an NTC thermistor can, however, as the material parameter 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 () -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 () 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 () -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 () 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 () 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 www.meas-spec.com 4/7 Max Deviation () 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 () 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 () 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 O 1.02 Typ 3D View HTM1735LF HPC035_K Footprint (Top View) www.meas-spec.com 5/7 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 www.meas-spec.com 6/7 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 General Eisenhower BP 23705 31037 TOULOUSE CEDEX 1 FRANCE Tel: +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 www.meas-spec.com 7/7 May 2008