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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= 25C 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 = 260C t10 s 0 -40 -20 0 20 40 60 80 100 TEMPERATURE IN C CHARACTERISTICS (Ta = 25C, 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 (CONTD) 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 = 25C 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 60C DEMO BOARD AVAILABLE ON REQUEST (REF HM1510) Typical Characteristics for Voltage Output Circuit At V 5V - 25C 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)