RELATIVE HUMIDITY SENSOR HS1101LF Meets RoHS regulations 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. MAIN 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 ● Patented solid polymer structure ● 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 profiles available on request / contact us at [email protected] MAXIMUM RATINGS Ratings Operating Range 100 Symbol Value Unit Ta -60 to 140 °C Storage Temperature Tstg -60 to 140 °C Supply Voltage (Peak) Vs 10 Vac Humidity Operating Range RH 0 to 100 % RH 90 80 70 Relative Humidity in % RH Operating Temperature 60 50 40 30 20 10 0 -60 -40 -20 0 20 40 60 80 100 120 140 Temperature in °C CHARACTERISTICS Humidity sensor (Ta = 25°C, measurement frequency @ 10kHz / 1V unless otherwise noted) Characteristics Symbol Min. Humidity measuring range RH 1 Supply voltage Vs Nominal capacitance @ 55% RH* C Temperature coefficient 177 Typ. 180 Tcc Averaged Sensitivity from 33% to 75% RH ∆C /% RH Leakage current (Vcc = 5 Volts) I Recovery time after 150 hours of condensation tr Max. Unit. 99 %RH 10 V 183 pF 0.01 pF/°C 0.31 pF/% RH 1 10 Humidity Hysteresis s +/-1 Long term stability τ Time constant (33 to 80 % RH, still air @ 63%) ta +/-0.5 3 Deviation to typical response curve (10% to 90%) RH) +/-2 nA %RH %RH/yr 5 s %RH *tighter specification available on request HUMIREL HPC052 Rev.E April 2007 TECHNICAL 1 DATA HS1101LF 160 TYPICAL RESPONSE: look-up table (Polynomial Reference curve) Polynomial response of HS1101LF: C (pF)=C@55 %*( 3.903 10 - 8 *RH 3 -8.294 10 - 6 *RH 2 +2.188 10 - 3 *RH+0.898) Typical response look-up table (Polynomial Reference curve) “10KHz/1V” RH (%) Cp (pF) RH (%) Cp (pF) 0 5 10 15 20 25 30 35 40 45 50 161.6 163.6 165.4 167.2 169.0 170.7 172.3 173.9 175.5 177.0 178.5 55 60 65 70 75 80 85 90 95 100 180 181.4 182.9 184.3 185.7 187.2 188.6 190.1 191.6 193.1 Reversed Polynomial response of HS1101LF: RH ( %) = -3.4656 10 + 3 *X 3 +1.0732 10 + 4 *X 2 -1.0457 10 + 4 *X+3.2459 10 + 3 ) With X=C(read) / C@55%RH MEASUREMENT FREQUENCY INFLUENCE In this data sheet, all capacitance measurements are done @ 10 kHz /1Volt. However, the sensor can operate without restriction from 5 kHz to 300 kHz. 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 We recommend taking specific attention to soldering conditions to get the best performance of Humirel sensors. See Application Note. To get it, please contact: [email protected]. PROPORTIONAL VOLTAGE OUTPUT CIRCUIT Block diagram HUMIREL HPC052 Rev.E April 2007 TECHNICAL 2 DATA HS1101LF FREQUENCY OUTPUT CIRCUITS Note: R22=499kΩ / R4=49.9kΩ / R1=1 kΩ / RV1=50 kΩ 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: ¾ thigh = C@%RH*(R22+R4)*ln2 ¾ tlow= C@%RH*R22*ln2 ¾ F = 1 / ( t h i g h + t l ow ) = 1 / ( C @ % R H * ( R 4 + 2 * R 2 2 ) * l n 2 ) ¾ 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. Typical response look-up table RH (%) Fout (Hz) RH (%) Fout (Hz) 0 5 10 15 20 25 30 35 40 45 50 7155 7080 7010 6945 6880 6820 6760 6705 6650 100 55 60 65 70 75 80 85 90 95 6600 6550 6500 6450 6400 6355 6305 6260 6210 MEASUREMENT ERROR VS STRAY CAPACITANCE - 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. HUMIREL HPC052 Rev.E April 2007 TECHNICAL 3 DATA HS1101LF QUALIFICATION PROCESS 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(260°C) + DI water clean at 45°C 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 - 40°C / +125°C High Temperature / Humidity Operating Life - 93%RH / 60°C for 1000 hours Low Humidity storage life - RH < 10%/23°C - 1000 hours Resistance to immersion in water at ambient temperature and 80°C High temperature storage 140°C 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. PACKAGE OUTLINE Dimensions in millimeters To distinguish HS1101 from HS1101LF, HS1101LF is designed with a black plastic cap ORDERING INFORMATION: HS1101LF: HPP801A031 (MULTIPLE PACKAGE QUANTITY OF 48 PIECES) CAPACITIVE RELATIVE HUMIDITY SENSOR. 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. HUMIREL HPC052 Rev.E April 2007 TECHNICAL 4 DATA HS1101LF