technical data 1 relative humidity sensor hs 1100 / hs 1101 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. f eatures full interchangeability with no calibration required in standard conditions instantaneous desaturation after long periods in saturation phase compatible with automatized assembly processes, including wave soldering, 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 (1) soldering temperature profiles available on request m aximum ratings (ta= 25c unless otherwise noted) c haracteristics rati ngs symbol value unit operating temperature t a -40 to 100 ? storage temperature t stg -40 to 125 ? supply voltage vs 10 vac humidity operating range rh 0 to 100 % rh soldering @ t = 260? t10s characteristics symbol min. typ. max. unit. humidity measuring range rh 1 99 % supply voltage vs 5 10 v nominal capacitance @ 55% rh* c 177 180 183 pf t emperature coefficient t cc 0.04 pf/? a veraged sensitivity from 33% to 75% rh ? c/%rh 0.34 pf/%rh leakage current (vcc = 5 volts) i x 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 (ta = 25c, measurement frequency @ 10khz unless otherwise noted) temperature in c 100 75 50 0 -40 -20 0 20 40 60 80 25 operating range relative humidity in % steady state 100 peak conditions * tighter specification available on request hpc001 rev. 7 june 2002 1 2 hs 1100 t op opening hs 1101 side opening
technical data 2 c haracteristics (contd) p roportional voltage output circuit 160 165 170 175 180 185 190 capacitance (in pf) 010 2030 4050 6070 8090100 195 200 205 % rh t ypical response curve of hs 1100/hs 1101 in humidity calibration data are traceable to nist standards through cetiat laboratory. measurement frequency : 10khz ta = 25c polynomial response : c(pf)=c@55% * (1.2510 -7 rh 3 -1.3610 -5 rh 2 +2.1910 -3 rh+9.010 -1 ) 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 internal block diagram t ypical characteristics for voltage output circuit at v cc 5v - 25c reference oscillator sensor oscillator l.p. filter gain v out v out =v cc * (0.00474 * %rh+0.2354) for 5 - 99% rh typical temperature coefficient : +0.1% rh/c - from 10 to 60c demo board available on request (ref hm1510) rh voltag e (v) 0 - 1.41 1.65 1.89 2.12 2.36 2.60 2.83 3.07 3.31 3.55 10 20 30 40 50 60 70 80 90 100 hpc001 rev. 7 june 2002 rh in % rh
technical data 3 f requency o utput c ircuits hpc001 rev. 7 june 2002 3 7 2 56 4 r tr cv th dc q ic1 tlc555 r2 576k r4 49.9k r3 1k r1 909k hs11xx 180p@55%rh gnd fout 3.5 to 12v comments this circuit is the typical astable design for 555. the HS1100/hs1101, used as varia- ble capacitor, is connected to the trig and thres pin. pin 7 is used as a short circuit pin for resistor r4. the HS1100/hs1101 equivalent capacitor is charged through r2 and r4 to the threshold voltage (approximately 0.67vcc) and discharged through r2 only to the trig- ger 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, r2 and r4, the duty cycle is determined by : t high = c@%rh * (r2+r4) * ln2 t low = c@%rh * r2 * ln2 f = 1/(t high +t low ) = 1/(c@%rh * (r4+2 * r2) * ln2) output duty cycle = t high * f = r2/(r4+2 * r2) to provide an output duty cycle close to 50%, r4 should be very low compared to r2 but never under a minimum value. resistor r3 is a short circuit protection. 555 must be a cmos version. remark r1 unbalances the internal temperature compensation scheme of the 555 in order to introduce a temperature coefficient that matches the HS1100/hs1101 temperature coefficient. in all cases, r1 should be a 1% resistor with a maximum of 100ppm coefficient temperature like all other r-c timer resistors. since 555 internal temperature compensation changes from one trademark to one other, r1 value should be adapted to the specific chip. to keep the nominal frequency of 6660hz at 55%rh, r2 also needs slight adjustment as shown in the table. 555 type tlc555 (texas) 909k ? 576k ? ts555 (stm) 100nf capacitor 523k ? 7555 (harris) 1732k ? 549k ? lmc555 (national) 1238k ? 562k ? r1 r2 for a frequency of 6660hz at 55%rh t ypical characteristics for frequency output circuits reference point at 6660hz for 55%rh / 25c rh frequency 0 7351 7224 7100 6976 6853 6728 6600 6468 6330 6186 6033 10 20 30 40 50 60 70 80 90 100 typical for a 555 cmos type. tlc555 (rh : relative humidity in %, f : frequency in hz) polynomial response : f mes(hz) = f55 (hz) (1.1038-1.936810 -3 * rh+3.011410 -6 * rh 2 -3.440310 -8 * rh 3 ) measurement error vs stray capacitance a 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. -10 -8 -6 -4 -2 0 2 4 6 8 10 123456789101112 13 14 15 16 17 18 19 20 21 22 23 24 25 0 12% rh 33% rh 55% rh 75.5% rh 97.5% rh nominal capacitance : 180pf nominal humidity : 55%rh frequency range : 0khz to 25khz stray capacitance (pf) error in %rh bill of material available on request
technical data 4 q ualification process - HS1100/hs1101 sensors have been qualified through a complete qualification process taking in account many of the requirements of the mil std750 including : environmental and recycling information : - HS1100/hs1101 sensors are lead free components - HS1100/hs1101 sensors are free of cr (vi), cd and hg. solder heat and solderability wave soldering at 260c + di water clean at 45c mechanical shock - 1500 g, 5 blows, 3 directions vibration - variable (f = 100 - 2000hz), fixed (f = 35hz) constant acceleration marking permanency esd - electrostatic discharge - human boby & machine model salt atmosphere mil std750/method 1041/96 hours temperature cycling - 40c / +85c 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 - 160 hours resistance to acid vapors at 75000 ppm for nitric, sulfuric and chlorhydric acids resistance to many chemicals linked with home appliances/ automotive or consumer applications. j g h k 1 2 e d c a b f j g h k a b c e d 1 2 the information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsability is assumed f or 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 wi thout 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 li ability 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 ?para meters 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. shoul d 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 distr ibutors 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 uni ntended 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. hpc001 rev. 7 june 2002 ordering information : hs 1100 : hpp 800 a 001 (multiple package quantity of 50 pieces) hs 1101 : hpp 801 a 001 (multiple package quantity of 48 pieces) capacitive relative humidity sensor. email : sales@humirel.com sample kit of HS1100-hs1101 is available through humirel web site www.humirel.com p ackage outline HS1100 all these tests are regularly performed on different lots from production. more information are available on request dim min (mm) max (mm) a 9.70 10.20 b 5.70 6.20 c 0.40 0.60 d 12.00 14.00 e 0.40 0.50 g 45 bcs h 0.70 1.10 j 0.70 0.90 k 4.83 5.33 dim min (mm) max (mm) a 9.00 9.30 b 8.00 8.50 c 3.50 3.90 d 12.00 14.00 e 0.40 0.50 g 45 bcs h 0.70 1.10 j 0.70 0.90 k 4.83 5.33 pa ckage outline hs1101
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