TECHNICAL 1 DATA HS 1100 / HS 1101 RELATIVE HUMIDITY SENSOR Based on a unique capacitive cell, these relative humidity sensors are designed for high volume, cost sensitive applications such as office automation, automotive cabin air control, home appliances, and industrial process control systems. They are also useful in all applications where humidity compensation is needed. 1 2 FEATURES Full interchangeability with no calibration required in standard conditions Instantaneous desaturation after long periods in saturation phase Compatible with automatized assembly processes, including wave soldering, reflow and water immersion (1) High reliability and long term stability Patented solid polymer structure Suitable for linear voltage or frequency output circuitry Fast response time Individual marking for compliance to stringent traceability requirements HS 1100 Top opening HS 1101 Side opening (1) soldering temperature profiles available on request MAXIMUM RATINGS (Ta= 25C unless otherwise noted) Supply Voltage Vs 10 Vac Humidity Operating Range RH 0 to 100 % RH t 10 s Soldering @ T = 260C RELATIVE HUMIDITY IN % C 75 50 25 0 -40 CHARACTERISTICS S -40 to 125 ON Tstg ITI Storage Temperature ND C CO -40 to 100 AK Ta E AT ST Operating Temperature OPERATING RANGE 100 DY Unit EA Value ST Symbol PE Ratings -20 0 20 40 60 80 100 TEMPERATURE IN C (Ta = 25C, measurement frequency @ 10kHz unless otherwise noted) Characteristics Symbol Min. Typ. Max. Unit. 99 % 5 10 V 180 183 pF Humidity measuring range RH Supply voltage Vs Nominal capacitance @ 55% RH* C Temperature coefficient Tcc 0.04 pF/C C/%RH 0.34 pF/%RH Leakage current (Vcc = 5 Volts) Ix 1 nA Recovery time after 150 hours of condensation tr 10 s Humidity Hysteresis +/-1.5 % Long term stability 0.5 %RH/yr 5 s +/-2 % RH Averaged Sensitivity from 33% to 75% RH Response time (33 to 76 % RH, still air @ 63%) Deviation to typical response curve (10% to 90% RH) ta 1 177 * Tighter specification available on request HPC001 Rev. 7 June 2002 TECHNICAL 2 DATA CHARACTERISTICS (CONT'D) Typical response curve of HS 1100/HS 1101 in humidity 205 200 195 capacitance (in pF) 190 Calibration data are traceable to NIST standards through CETIAT laboratory. 185 180 Measurement frequency : 10kHz Ta = 25C 175 170 165 160 0 10 20 30 40 50 60 70 80 90 100 % RH Polynomial response : C(pf)=C@55% * (1.2510 -7 RH 3 -1.3610 -5 RH 2 +2.1910 -3 RH+9.010 -1 ) RH in % RH Measurement frequency influence In this data sheet, all capacitance measurements are @ 10kHz. However, the sensor can operate without restriction from 5kHz to 100kHz. To calculate the influence of frequency on capacitance measurements : C@fkHz=C@10kHz(1.027-0.01185Ln(fkHz)) Polarization In order to get a better reproducibility during measurements, always connect the case of the header (pin 2) to the ground of the circuit. The case of the header is located on the opposite side of the tab. Soldering instructions : see the Application Note HPC007 PROPORTIONAL VOLTAGE OUTPUT CIRCUIT Internal Block Diagram V out =V cc * (0.00474 * %RH+0.2354) Reference Oscillator L.P. Filter for 5 - 99% RH Vout Gain Typical temperature coefficient : Sensor Oscillator +0.1% RH/C - From 10 to 60C DEMO BOARD AVAILABLE ON REQUEST (REF HM1510) Typical Characteristics for Voltage Output Circuit At Vcc 5V - 25C RH Voltage (V) HPC001 Rev. 7 June 2002 0 10 20 30 40 50 60 70 80 90 100 - 1.41 1.65 1.89 2.12 2.36 2.60 2.83 3.07 3.31 3.55 TECHNICAL 3 DATA FREQUENCY OUTPUT CIRCUITS COMMENTS 3.5 TO 12V R2 576K Q 3 DC 7 IC1 2 TR 5 CV This circuit is the typical astable design for 555. The HS1100/HS1101, used as variable capacitor, is connected to the TRIG and THRES pin. Pin 7 is used as a short circuit pin for resistor R4. The HS1100/HS1101 equivalent capacitor is charged through R2 and R4 to the threshold voltage (approximately 0.67Vcc) and discharged through R2 only to the trigger level (approximately 0.33Vcc) since R4 is shorten to ground by pin 7. Since the charge and discharge of the sensor run through different resistors, R2 and R4, the duty cycle is determined by : R4 49.9K R3 1K FOUT TLC555 R TH 6 4 t high = C@%RH * (R2+R4) * ln2 t low = C@%RH * R2 * ln2 R1 909K HS11XX F = 1/(t high +t low ) = 1/(C@%RH * (R4+2 * R2) * ln2) Output duty cycle = t high * F = R2/(R4+2 * R2) 180p@55%RH To provide an output duty cycle close to 50%, R4 should be very low compared to R2 but never under a minimum value. Resistor R3 is a short circuit protection. 555 must be a CMOS version. GND BILL OF MATERIAL AVAILABLE ON REQUEST REMARK R1 unbalances the internal temperature compensation scheme of the 555 in order to introduce a temperature coefficient that matches the HS1100/HS1101 temperature coefficient. In all cases, R1 should be a 1% resistor with a maximum of 100ppm coefficient temperature like all other R-C timer resistors. Since 555 internal temperature compensation changes from one trademark to one other, R1 value should be adapted to the specific chip. To keep the nominal frequency of 6660Hz at 55%RH, R2 also needs slight adjustment as shown in the table. 555 Type R1 R2 TLC555 (Texas) 909k 576k TS555 (STM) 100nF capacitor 523k 7555 (Harris) 1732k 549k 1238k 562k LMC555 (National) For a frequency of 6660Hz at 55%RH Typical Characteristics for Frequency Output Circuits REFERENCE POINT AT 6660Hz FOR 55%RH / 25C RH Frequency 0 10 20 30 40 50 60 70 80 90 100 7351 7224 7100 6976 6853 6728 6600 6468 6330 6186 6033 Typical for a 555 Cmos type. TLC555 (RH : Relative Humidity in %, F : Frequency in Hz) Polynomial response : Measurement Error vs Stray Capacitance A special attention is required in order to minimize stray capacitance in the layout. The added capacitance will act as a parallel capacitance with the sensor and create a measurement error. Error in %RH F mes(Hz) = F55 (Hz) (1.1038-1.936810 -3 * RH+3.011410 -6 * RH 2 -3.440310 -8 * RH 3 ) 10 8 6 12% RH 4 33% RH 2 55% RH 0 -2 75.5% RH -4 -6 97.5% RH Nominal Capacitance : 180pF Nominal Humidity : 55%RH Frequency Range : 0kHz to 25kHz -8 -10 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 Stray capacitance (pF) HPC001 Rev. 7 June 2002 TECHNICAL 4 DATA QUALIFICATION PROCESS - HS1100/HS1101 sensors have been qualified through a complete qualification process taking in account many of the requirements of the MIL STD750 including : Solder heat and solderability Wave soldering at 260C + DI water clean at 45C Mechanical shock - 1500 g, 5 blows, 3 directions Vibration - Variable (F = 100 - 2000Hz), fixed (F = 35Hz) Constant acceleration Marking permanency ESD - Electrostatic Discharge - Human boby & Machine model Salt Atmosphere MIL STD750/Method 1041/96 hours Temperature Cycling - 40C / +85C High Temperature / Humidity Operating Life - 93%RH / 60C for 1000 hours Low humidity storage life - RH < 10%/23C - 1000 hours Resistance to immersion in water at ambient temperature and 80C - 160 hours Resistance to acid vapors at 75000 ppm for nitric, sulfuric and chlorhydric acids Resistance to many chemicals linked with home appliances/ automotive or consumer applications. All these tests are regularly performed on different lots from production. More information are available on request Environmental and recycling information - HS1100/HS1101 sensors are lead free components - HS1100/HS1101 sensors are free of Cr (VI), Cd and Hg. : A PACKAGE OUTLINE HS1100 Dim E D Dim Min (mm) Max (mm) 1 2 K A B C D E G H J K 9.00 9.30 8.00 8.50 3.50 3.90 12.00 14.00 0.40 0.50 45 BCS 0.70 1.10 0.70 0.90 4.83 5.33 G H J A B C F E D 2 Min (mm) Max (mm) B C A B C D E G H J K 9.70 10.20 5.70 6.20 0.40 0.60 12.00 14.00 0.40 0.50 45 BCS 0.70 1.10 0.70 0.90 4.83 5.33 1 K G H PACKAGE OUTLINE HS1101 J ORDERING INFORMATION : HS 1100 : HPP 800 A 001 (MULTIPLE PACKAGE QUANTITY OF 50 PIECES) HS 1101 : HPP 801 A 001 (MULTIPLE PACKAGE QUANTITY OF 48 PIECES) CAPACITIVE RELATIVE HUMIDITY SENSOR. SAMPLE KIT OF HS1100-HS1101 IS AVAILABLE THROUGH HUMIREL WEB SITE www.humirel.com email : sales@humirel.com The information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsability 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. Humirel reserves the right to make changes without further notice to any product herein. Humirel makes no warranty, representation or guarantee regarding the suitability of its product for any particular purpose, nor does Humirel 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, including Typical must be validated for each customer applications by customer's technical experts. Humirel does not convey any license under its patent rights nor the rights of others. Humirel products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other application intended to support or sustain life, or for any application in which the failure of the Humirel product could create a situation where personal injury or death may occur. Should buyer purchase or use Humirel products for any such unintended or unauthorized application, Buyer shall indemnify and hold Humirel and its officers, employees, subsidaries, affiliates and distributors harmless against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of presonal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Humirel was negligent regarding the design or manufacture of the part.Humirel is a registred trade mark of Humirel. HPC001 Rev. 7 June 2002