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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 application@humirel.com
Operating Range
100
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
Relative Humidity in % RH
90 80
C C Vac % RH
70 60 50 40 30 20 10 0 -60 -40 -20 0 20 40 60 80 100 120 140 160 Temperature in C
CHARACTERISTICS
Humidity sensor (Ta = 25C, measurement frequency @ 10kHz / 1V unless otherwise noted)
Characteristics
Humidity measuring range Supply voltage 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) ta +/-0.5 3 +/-2 5
Symbol
RH Vs C Tcc C /% RH I tr
Min.
1
Typ.
Max.
99 10
Unit.
%RH V pF pF/C pF/% RH
177
180
183 0.01
0.31 1 10 +/-1
nA s %RH %RH/yr s %RH
*tighter specification available on request
HUMIREL HPC052 Rev.E April 2007
TECHNICAL 1 DATA
HS1101LF
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) 0 161.6 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
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: application@humirel.com.
PROPORTIONAL VOLTAGE OUTPUT CIRCUIT
Block diagram
HUMIREL HPC052 Rev.E April 2007
TECHNICAL 2 DATA
HS1101LF
FREQUENCY OUTPUT CIRCUITS
Note: R22=499k / R4=49.9k / R1=1 k / RV1=50 k 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 / ( t h i g h + t l ow ) = 1 / ( C @ % R H * ( R 4 + 2 * R 2 2 ) * l n 2 ) 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 7155 55 6600 60 6550 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 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(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.
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

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