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1、 HS1101LF Relative Humidity Sensor Lead free component High reliability and long term stability Patented solid polymer structure Suitable for linear voltage or frequency output circuitry Fast response time and very low temperature coefficient DESCRIPTION Based on a unique capacitive cell, these rela
2、tive 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. FEATURES APPLICATIONS Full
3、l interchangeability with no calibration required in standard conditions Automotive Instantaneous desaturation after long periods in saturation phase Home Appliance Compatible with automatized assembly processes, including Pb free wave soldering and reflow processes (1) Printers Meteorology Individu
4、al marking for compliance to stringent traceability requirements Part may be washed with distilled water PERFORMANCE SPECS MAXIMUM RATINGS Peak conditions: less than 10% of the operating time. Ratings Symbol Value Unit Operating Temperature Ta -60 to 140 C Storage Temperature Tstg -60 to 140 C Suppl
5、y Voltage (Peak) Vs 10 Vac Humidity Operating Range RH 0 to 100 % RH HS1101LF Relative Humidity Sensor ELECTRICAL CHARACTERISTICS OF HUMIDITY SENSOR (Ta=25C, measurement frequency 10kHz / 1V unless otherwise noted) (1) Tighter specification available on request TYPICAL PERFORMANCE CURVES POLYNOMIAL
6、RESPONSE OF HS1101LF C (pF)=C55 %*( 3.903 10-8*RH3-8.294 10-6*RH2+2.188 10-3*RH+0.898) TYPICAL RESPONSE LOOK-UP TABLE (POLYNOMIAL REFERENCE CURVE) 10KHZ / 1V RH (%) 0 5 10 15 20 25 30 35 40 45 50 Cp (pF) 161.6 163.6 165.4 167.2 169.0 170.7 172.3 173.9 175.5 177.0 178.5 RH (%) 55 60 65 70 75 80 85 90
7、 95 100 Cp (pF) 180 181.4 182.9 184.3 185.7 187.2 188.6 190.1 191.6 193.1 REVERSE POLYNOMIAL RESPONSE OF HS1101LF RH (%) = -3.4656 10+3*X3+1.0732 10+4*X2-1.0457 10+4*X+3.2459 10+3) With X=C(read) / C55%RH MEASUREMENT FREQUENCY INFLUENCE In this data sheet, all capacitance measurements are done 10 kH
8、z / 1Volt. However, the sensor can operate without restriction from 5 kHz to 300 kHz. Characteristics Symbol Min Typ Max Unit Humidity Measuring Range RH 1 99 %RH Supply Voltage Vs 10 V Nominal capacitance 55%RH (1) C 177 180 183 pF Temperature coefficient Tcc 0.01 pF/C Average Sensitivity from 33%
9、to 75%RH C/%RH 0.31 pF/%RH Leakage Current (Vcc=5V) I 1 nA Recovery time after 150 hours of condensation tr 10 s Humidity Hysteresis +/-1 %RH Long term stability T +/-0.5 %RH/yr Time Constant (at 63% of signal, still air) 33%RH to 80%RH ta 3 5 s Deviation to typical response curve (10% RH to 90%RH)
10、+/-2 %RH 毕工：1 8 9 3 8 6 3 9 0 5 2HS1101LF Relative Humidity Sensor POLARISATION 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 INSTR
11、UCTIONS We recommend taking specific attention to soldering conditions to get the best performance of MEAS-France sensors. See Application Note. To get it, please contact: PROPORTIONAL VOLTAGE OUTPUT CIRCUIT BLOCK DIAGRAM FREQUENCY OUTPUT CIRCUIT CIRCUIT Note: R22=499k / R4=49.9k / R1=1 k / RV1=50 k
12、 potentiometer / C1=10nF / C2=2.2nF / C3=100nF HS1101LF Relative Humidity Sensor This circuit is the typical astable design for 555. The HS1101LF, 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 HS1101LF equivalent capacit
13、or is charged through R22 and R4 to the threshold voltage (approximately 0.67Vcc) and discharged through R22 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, R22 and R4, the duty cy
14、cle is determined by: ? thigh = C%RH*(R22+R4)*ln2 ? tlow= C%RH*R22*ln2 ? F = 1/(thigh+tlow) = 1/(C%RH*(R4+2*R22)*ln2) ? Output duty cycle = thigh*F = R22/(R4+2*R22) To provide an output duty cycle close to 50%, R4 should be very low compared to R22 but never under a minimum value. Resistor R3 is a s
15、hort circuit protection. 555 must be a CMOS version. TYPICAL RESPONSE LOOK-UP TABLE RH (%) 0 5 10 15 20 25 30 35 40 45 50 Fout (Hz) 7155 7080 7010 6945 6880 6820 6760 6705 6650 RH (%) 55 60 65 70 75 80 85 90 95 100 Fout (Hz) 6600 6550 6500 6450 6400 6355 6305 6260 6210 MEASUREMENT ERROR VS STRAY CAP
16、ACITANCE 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. A careful coating of PCB and components must be implemented to prevent unexpected deviations of Fout in high humidity conditions. HS1101LF Relative Humidity Sensor QUALIFICA
