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TECHNICAL 1 DATA
RELATIVE HUMIDITY SENSOR HS 1100 / HS 1101
1 2
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
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
HS 1100 Top opening
MAXIMUM RATINGS (Ta= 25C unless otherwise noted)
Ratings Symbol Value Unit
OPERATING RANGE
100 RELATIVE HUMIDITY IN %
ST
HS 1101 Side opening
PE AK CO
Operating Temperature Storage Temperature Supply Voltage Humidity Operating Range Soldering @ T = 260C
Ta Tstg Vs RH t
-40 to 100 -40 to 125 10 0 to 100 10
C C Vac % RH s
ND ITI ON
75
EA DY E AT ST
S
50
25
CHARACTERISTICS
(Ta = 25C, measurement frequency @ 10kHz unless otherwise noted)
0 -40
-20
0
20
40
60
80
100
TEMPERATURE IN C
Characteristics
Symbol
Min.
Typ.
Max.
Unit.
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 Response time (33 to 76 % RH, still air @ 63%) Deviation to typical response curve (10% to 90% RH)
RH Vs C Tcc
1 5 177 180 0.04 0.34 1 10 +/-1.5 0.5
99 10 183
% V pF pF/C pF/%RH nA s % %RH/yr s % RH
C/%RH
Ix tr
ta
5 +/-2
* Tighter specification available on request
HPC001 Rev. 7 June 2002
TECHNICAL 2 DATA
CHARACTERISTICS (CONT'D)
Typical response curve of HS 1100/HS 1101 in humidity
205 200
195
190
capacitance (in pF)
185
Calibration data are traceable to NIST standards through CETIAT laboratory. Measurement frequency : 10kHz Ta = 25C
180
175
170
165
160 0 10 20 30 40 50 60 70 80 90 100
% RH
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
RH in % RH
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
PROPORTIONAL VOLTAGE OUTPUT CIRCUIT
Internal Block Diagram V out =V cc * (0.00474 * %RH+0.2354)
Reference Oscillator L.P. Filter Sensor Oscillator Gain Vout for 5 - 99% RH Typical temperature coefficient : +0.1% RH/C - From 10 to 60C
DEMO BOARD AVAILABLE ON REQUEST (REF HM1510)
Typical Characteristics for Voltage Output Circuit
At Vcc 5V - 25C RH Voltage (V)
HPC001 Rev. 7 June 2002
0
10 1.41
20 1.65
30 1.89
40 2.12
50 2.36
60 2.60
70 2.83
80 3.07
90 3.31
100 3.55
-
TECHNICAL 3 DATA
FREQUENCY OUTPUT CIRCUITS
COMMENTS
3.5 TO 12V
R2 576K
R4 49.9K R3 1K
FOUT
Q
3 7
IC1
DC 2 TR TLC555 5 CV TH
6
This circuit is the typical astable design for 555. The HS1100/HS1101, 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 HS1100/HS1101 equivalent capacitor is charged through R2 and R4 to the threshold voltage (approximately 0.67Vcc) and discharged through R2 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, R2 and R4, the duty cycle is determined by :
R
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.
R1
909K
HS11XX
180p@55%RH
GND
BILL OF MATERIAL AVAILABLE ON REQUEST
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.
4
555 Type
TLC555 (Texas) TS555 (STM) 7555 (Harris) LMC555 (National)
R1
909k 100nF capacitor 1732k 1238k
R2
576k 523k 549k 562k
For a frequency of 6660Hz at 55%RH
Typical Characteristics for Frequency Output Circuits
REFERENCE POINT AT 6660Hz FOR 55%RH / 25C RH Frequency 0 7351 10 7224 20 7100 30 6976 40 6853 50 6728 60 6600 70 6468 80 6330 90 6186 100 6033
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.
Error in %RH
10 8 6 4 33% RH 2 0 -2 -4 -6 -8 -10 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Stray capacitance (pF) Nominal Capacitance : 180pF Nominal Humidity : 55%RH Frequency Range : 0kHz to 25kHz 75.5% RH 97.5% RH 55% RH
12% RH
HPC001 Rev. 7 June 2002
TECHNICAL 4 DATA
QUALIFICATION PROCESS - HS1100/HS1101 sensors have been qualified through a complete qualification process taking in account many of the requirements of the MIL STD750 including : 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.
All these tests are regularly performed on different lots from production. More information are available on request Environmental and recycling information - HS1100/HS1101 sensors are lead free components - HS1100/HS1101 sensors are free of Cr (VI), Cd and Hg.
:
PACKAGE OUTLINE HS1100
Dim Min (mm) Max (mm)
A
Dim
B
Min (mm)
Max (mm)
C
E D
2
1
K
A B C D E G H J K
9.00 9.30 8.00 8.50 3.50 3.90 12.00 14.00 0.40 0.50 45 BCS 0.70 1.10 0.70 0.90 4.83 5.33
G H J
A B
F
C
E D
A B C D E G H J K
PACKAGE OUTLINE HS1101
9.70 10.20 5.70 6.20 0.40 0.60 12.00 14.00 0.40 0.50 45 BCS 0.70 1.10 0.70 0.90 4.83 5.33
2
1
K
G H J
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.
SAMPLE KIT OF HS1100-HS1101 IS AVAILABLE THROUGH HUMIREL WEB SITE
www.humirel.com
email : sales@humirel.com
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.
HPC001 Rev. 7 June 2002

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