PEAK CONDITIONS STEADY STATE TECHNICAL DATA 1 RELATIVE HUMIDITY SENSOR HS 1100 / HS 1101 Based on a unique capacitive cell, these relative humidity sensors are designed for high 1 volume, cost sensitive applications such as office automation, automotive cabin air control, home appliances, and industrial process control systems. They are 2 also useful in all applications where humidity compensation is needed. FEATURES ● Full interchangeability with no calibration required in standard conditions ● Instantaneous desaturation after long periods in saturation phase HS 1100 ● Compatible with automatized assembly processes, including wave soldering, Top opening 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 1101 (1) soldering temperature profiles available on request Side opening MAXIMUM RATINGS (Ta= 25°C unless otherwise noted) Ratings Symbol Value Unit OPERATING RANGE 100 Operating Temperature Ta -40 to 100 °C Storage Temperature Tstg -40 to 125 °C 75 Supply Voltage Vs 10 Vac 50 Humidity Operating Range RH 0 to 100 % RH 25 Soldering @ T = 260°C t10 s 0 -40 -20 0 20 40 60 80 100 TEMPERATURE IN °C CHARACTERISTICS (Ta = 25°C, measurement frequency @ 10kHz unless otherwise noted) Characteristics Symbol Min. Typ. Max. Unit. Humidity measuring range RH1 99% Supply voltage Vs 5 10 V Nominal capacitance @ 55% RH* C 177 180 183 pF Temperature coefficient Tcc 0.04 pF/°C Averaged Sensitivity from 33% to 75% RH ∆C/%RH 0.34 pF/%RH Leakage current (Vcc = 5 Volts) Ix 1nA Recovery time after 150 hours of condensation tr 10 s Humidity Hysteresis +/-1.5 % Long term stability 0.5 %RH/yr Response time (33 to 76 % RH, still air @ 63%) ta 5 s Deviation to typical response curve (10% to 90% RH) +/-2 % RH * Tighter specification available on request HPC001 Rev. 7 June 2002 RELATIVE HUMIDITY IN % TECHNICAL DATA 2 CHARACTERISTICS (CONT’D) Typical response curve of HS 1100/HS 1101 in humidity 205 200 195 190 Calibration data are traceable to NIST 185 standards through CETIAT laboratory. 180 Measurement frequency : 10kHz Ta = 25°C 175 170 165 160 010 2030 4050 6070 80 90 100 % RH -7 3 -5 2 -3 -1 Polynomial response : C(pf)=C@55% (1.2510 RH -1.3610 RH +2.1910 RH+9.010 ) * 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 =V (0.00474 %RH+0.2354) * * out cc Reference Oscillator for 5 - 99% RH V out L.P. Filter Gain Typical temperature coefficient : Sensor Oscillator +0.1% RH/°C - From 10 to 60°C DEMO BOARD AVAILABLE ON REQUEST (REF HM1510) Typical Characteristics for Voltage Output Circuit At V 5V - 25°C cc 0 10 20 30 40 50 60 70 80 90 100 RH Voltage (V) - 1.41 1.65 1.89 2.12 2.36 2.60 2.83 3.07 3.31 3.55 HPC001 Rev. 7 June 2002 capacitance (in pF) TECHNICAL DATA 3 FREQUENCY OUTPUT CIRCUITS COMMENTS 3.5 TO 12V This circuit is the typical astable design for 555. The HS1100/HS1101, used as varia- R2 576K R4 49.9K ble capacitor, is connected to the TRIG and THRES pin. Pin 7 is used as a short circuit pin for resistor R4. R3 1K 3 Q FOUT The HS1100/HS1101 equivalent capacitor is charged through R2 and R4 to the IC1 7 threshold voltage (approximately 0.67Vcc) and discharged through R2 only to the trig- DC 2 ger level (approximately 0.33Vcc) since R4 is shorten to ground by pin 7. TR TLC555 Since the charge and discharge of the sensor run through different resistors, R2 and 56 R4, the duty cycle is determined by : TH CV t = C@%RH (R2+R4) ln2 * * high t = C@%RH R2 ln2 * * R1 low 909K HS11XX F = 1/(t +t ) = 1/(C@%RH (R4+2 R2) ln2) 180p@55%RH * * * high low Output duty cycle = t F = R2/(R4+2 R2) * * high To provide an output duty cycle close to 50%, R4 should be very low compared to R2 GND but never under a minimum value. BILL OF MATERIAL AVAILABLE ON REQUEST Resistor R3 is a short circuit protection. 555 must be a CMOS version. REMARK R1 unbalances the internal temperature compensation scheme of the 555 Type R1 R2 555 in order to introduce a temperature coefficient that matches the TLC555 (Texas) 909kΩ 576kΩ HS1100/HS1101 temperature coefficient. In all cases, R1 should be a 1% resistor with a maximum of 100ppm coefficient temperature like all TS555 (STM) 100nF capacitor 523kΩ other R-C timer resistors. Since 555 internal temperature compensation 7555 (Harris) 1732kΩ 549kΩ 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, LMC555 (National) 1238kΩ 562kΩ R2 also needs slight adjustment as shown in the table. For a frequency of 6660Hz at 55%RH Typical Characteristics for Frequency Output Circuits REFERENCE POINT AT 6660Hz FOR 55%RH / 25°C RH 0 10 20 30 40 50 60 70 80 90 100 Frequency 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 : -3 -6 2 -8 3 F = F55 (1.1038-1.936810 RH+3.011410 RH -3.440310 RH ) * * * mes(Hz) (Hz) 10 Measurement Error 8 vs 6 Stray Capacitance 12% RH 4 A special attention is required 33% RH in order to minimize stray 2 capacitance in the layout. The added capacitance will 55% RH 0 act as a parallel capacitance with the sensor and create a -2 measurement error. 75.5% RH -4 97.5% RH -6 Nominal Capacitance : 180pF Nominal Humidity : 55%RH Frequency Range : 0kHz to 25kHz -8 -10 0 123456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Stray capacitance (pF) HPC001 Rev. 7 June 2002 4 R Error in %RH TECHNICAL DATA 4 ● 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 High Temperature / Humidity Operating Life - 93%RH / 60°C Wave soldering at 260°C + DI water clean at 45°C for 1000 hours Mechanical shock - 1500 g, 5 blows, 3 directions Low humidity storage life - RH < 10%/23°C - 1000 hours Vibration - Variable (F = 100 - 2000Hz), fixed (F = 35Hz) Resistance to immersion in water at ambient temperature Constant acceleration and 80°C - 160 hours Marking permanency Resistance to acid vapors at 75000 ppm for nitric, sulfuric ESD - Electrostatic Discharge - Human boby & Machine and chlorhydric acids model Resistance to many chemicals linked with home appliances/ Salt Atmosphere MIL STD750/Method 1041/96 hours automotive or consumer applications. Temperature Cycling - 40°C / +85°C 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 Dim Min (mm) Max (mm) PACKAGE C B OUTLINE A 9.70 10.20 HS1100 E D B 5.70 6.20 2 1 C 0.40 0.60 Dim Min (mm) Max (mm) K D 12.00 14.00 A 9.00 9.30 G E 0.40 0.50 H B 8.00 8.50 J G 45° BCS C 3.50 3.90 A B H 0.70 1.10 C F D 12.00 14.00 J 0.70 0.90 E E 0.40 0.50 D K 4.83 5.33 G 45° BCS 2 1 H 0.70 1.10 K PACKAGE J 0.70 0.90 OUTLINE G HS1101 K 4.83 5.33 H 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