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| HS1101LF Relative Humidity Sensor DESCRIPTION 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. FEATURES ! Lead Free Components ! Full Interchangeability with no calibration required in standard conditions ! Instantaneous desaturation after long periods in saturation phase ! Compatible with automatized assembly processes, including Pb free wave soldering and reflow processes (1) ! High Reliability and Long Term Stability ! Suitable for linear voltage or frequency output circuitry ! Fast response time and very low temperature coefficient ! Part may be washed with distilled water ! Individual marking for compliance to stringent traceability requirements (1) Soldering temperature profiels available upon request/contact us at application@humirel.com Relative Humidity in % RH 100 90 maximum ratings Ratings Operating Temperature Storage Temperature Supply Voltage (Peak) Humidity Operating Range Symbol Ta Tstg Vs RH Value -60 to 140 -60 to 140 10 0 to 100 Unit C C Vac % RH Operating Range ! Patented Solid Polymer Structure 80 70 60 50 40 30 20 10 0 -60 -40 -20 0 20 40 60 80 100 120 140 160 Temperature in C Measurement Specialties, Inc. G 1000 Lucas Way Hampton, VA 23666 USA G www.meas-spec.com G 757-766-1500 G 800-745-8008 G Fax 757-766-4297 -1- HS1101LF Relative Humidity Sensor C h a r a c t e r i s t i c s ( Ta = 2 5 C , m e a s u re m e n t f re q u e n c y @ 1 0 k H z u n l e s s o t h e r w i s e s t a t e d ) Characteristics Humidity metrology range Voltage supply Nominal capacitance @ 55% RH Temperature coefficient Averaged Sensitivity from 33% to 75% RH Leakage current (Vcc=5 Volts) Recovery time after 150 hours of condensation Humidity Hysteresis Long term stability Time constant (33 to 80% RH, still air, @ 63%) Deviation to typical response curve (10% to 90%) RH) t +/-0.5 3 +/-2 5 Symbol RH Vs C Tcc C /% RH I tr 10 +/-1 0.31 1 177 180 Min 1 Typ Max 99 10 183 0.01 Unit % RH V pF pF/C pf/% RH nA s % RH % RH/yr s % RH Ty p i c a l re s p o n s e l o o k - u p t a b l e ( P o l y n o m i a l R e f e re n c e c u r v e ) 1 0 k H z / 1 V RH (%) Cp (pF) RH (%) Cp (pF) 0 161.6 55 180 5 163.6 60 181.4 10 165.4 65 182.9 15 167.2 70 184.3 20 169.0 75 185.7 25 170.7 80 187.2 30 172.3 85 188.6 35 173.9 90 190.1 40 175.5 95 191.6 45 177.0 100 193.1 50 178.5 Polynomial response of HS1101LF: C (pF)=C@55 %*( 3.903 10-8 *RH3-8.294 10-6 *RH2+2.188 10-3 *RH+0.898) Reversed 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) / C@55%RH P ro p o r t i o n a l Vo l t a g e O u t p u t C i rc u i t Block Diagram Measurement Specialties, Inc. G 1000 Lucas Way Hampton, VA 23666 USA G www.meas-spec.com G 757-766-1500 G 800-745-8008 G Fax 757-766-4297 -2- HS1101LF Relative Humidity Sensor F re q u e n c y O u t p u t C i rc u i t s Note: R22=499kS / R4=49.9S? / R1=1 kS / RV1=50 kS potentiometer / C1=10nF / C2=2.2nF / C3=100nF 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 capacitor 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 cycle 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 short circuit protection. 555 must be a CMOS version. Ty p i c a l re s p o n s e l o o k - u p t a b l e ( H u m i d i t y O u t p u t ) RH (%) Fout (Hz) RH (%) Fout (Hz) 55 6600 60 6550 0 5 10 7155 65 6500 15 7080 70 6450 20 7010 75 6400 25 6945 80 6355 30 6880 85 6305 35 6820 90 6260 40 6760 95 6210 45 6705 100 50 6650 Measurement Specialties, Inc. G 1000 Lucas Way Hampton, VA 23666 USA G www.meas-spec.com G 757-766-1500 G 800-745-8008 G Fax 757-766-4297 -3- HS1101LF Relative Humidity Sensor M e a s u re m e n t E r ro r v s S t r a y C a p a c i t a n c e -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. Q u a l i f i c a t i o n P ro c e s s HS1101LF sensors have been qualified through a complete qualification process taking in account many of the requirements of the JEDEC standard including: * * * * * * * Solder heat and solderability including lead free process. Pb free wave soldering and reflow soldering process(260C) + DI water clean at 45C Mechanical shock JESD-22-B104-A Vibration - Variable frequency(20 to 2000Hz) JESD-22-B103-A Marking permanency ESD - Electrostatic Discharge -Air Gun +-15kV(IEC 1000) Salt Atmosphere JESD22-A107-A * * * * * * Temperature Cycling - 40C / +125C 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 High temperature storage 140C for 168 hours. Resistance to many chemicals linked to home appliances/automotive or consumer applications. ENVIRONMENTAL AND RECYCLING HS1101LF sensors are lead free components and are compatible with Pb Free soldering processes. HS1101LF sensors are free from Cr (6+), Cd and Hg. Package Outline HS1101LF O rd e r i n g I n f o r m a t i o n : H S 1 1 0 1 L F HS1101LF: HPP801A031 (MULTIPLE PACKAGE QUANTITY OF 48 PIECES) CAPACITIVE RELATIVE HUMIDITY SENSOR. Dimensions in millimeters Measurement Specialties, Inc. G 1000 Lucas Way Hampton, VA 23666 USA G www.meas-spec.com G 757-766-1500 G 800-745-8008 G Fax 757-766-4297 HS1101LF-0407 -4- |
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