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TECHNICAL 1 DATA
TEMPERATURE AND RELATIVE HUMIDITY SENSOR HTS2010SMD
Based on a unique capacitive cell for humidity measurement and a Negative Temperature Coefficient (NTC) thermistor for temperature measurement, this dual purpose relative humidity / temperature miniaturized sensor is designed for high volume, cost sensitive applications with tight space constraints. It is useful in all applications where dew point, absolute humidity measurements or humidity compensation are required.
MAIN FEATURES
Miniature Surface mount SMD package Compatible with automated assembly processes, including wave soldering, water immersion and reflow soldering Full interchangeability with no calibration required in standard conditions High reliability and long term stability Available in tape and reel for automatic pick and place Individual marking for compliance to stringent traceability requirements
HTS2010SMD
HUMIDITY SENSOR SPECIFIC FEATURES
Instantaneous desaturation after long periods in saturation phase Patented solid polymer structure Suitable for linear voltage or frequency output circuitry Fast response time
RH
TEMPERATURE SENSOR SPECIFIC FEATURES
High quality thermistor Stable High sensitivity
T
MAXIMUM RATINGS
Ratings Symbol
(Ta = 25C unless otherwise noted)
Value
Unit
Storage Temperature Supply Voltage on humidity cell Humidity Operating Range Temperature Operating Range Maximum Electric Power to be supplied (continuous) @ 25C
Tstg Vs RH Ta P25
- 40 to 100 10 0 to 100 - 40 to 100 2
C Vac % RH C mW
CHARACTERISTICS
Humidity sensor
Characteristics
(Ta = 25C, Vs = 5 volts, measurement frequency @ 10 kHz unless otherwise noted)
Symbol
Min.
Typ.
Max.
Unit.
Humidity measuring range Nominal capacitance @ 55 % RH* Averaged Sensitivity from 33 % to 75 % RH Long term stability Recovery time after 150 hours of condensation Response time (33 to 76 % RH, static, @ 63 %)
RH C
C/%RH
1 177 180 0.34 0.5 10
99 183
% pF pF/%RH %RH/yr s s
10
Humirel Sensor Device Data / HPC008 Rev E September 2002
TECHNICAL 2 DATA
CHARACTERISTICS (CONT)
Humidity sensor
Characteristics
(Ta = 25C, measurement frequency @ 10 kHz unless otherwise noted)
Symbol
Min.
Typ.
Max.
Unit.
Temperature coefficient at 55 % RH / 10 to 40C Humidity Hysteresis Deviation to typical curve (see below) (10 % to 90 % RH) Supply voltage Leakage current (Vs = 5 volts)
*Tighter tolerance available on request
Tcc
+ 0.04 +/-1.5 +/-2
pF/C % RH % RH 10 1 Vac nA
Vs
x
1
5
Temperature sensor
Characteristics Symbol Min. Typ. Max. Unit.
Nominal resistance @ 25C Beta value : B25/100 Temperature measuring range Nominal Resistance Tolerance* B value tolerance Response Time
*Tighter tolerance available on request
10 B Ta Rn B
k 3800 100 C % % s 3
3600 - 40
3730 2 3 10
Typical response curve of HTS2010SMD in humidity
205 200 195 190 185 180 175 170 165 160 0 10 20 30 40 50 60 70 80 90 100 Relative Humidity (% RH)
Calibration data are traceable to NIST standards through CETIAT laboratory.
Measurement frequency : 10 kHz Ta = 25C Polynomial response :
capacitance (in pF)
C in pF, RH in %
C -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 R NTC standardized ohm C ohm 262960 194110 144790 109030 82923 63591 49204 38279 30029 23773 18959 15207 12280 10000 8178 35 40 45 50 55 60 65 70 75 80 85 90 95 100 6734 5575 4636 3874 3237 2720 2304 1960 1674 1432 1235 1067 927 809 C -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 R NTC exponential ohm C ohm 35 40 45 50 55 60 65 70 75 80 85 90 95 100 6670 5500 4550 3800 3180 2690 2270 1940 1650 1430 1230 1070 925 810
Typical temperature output
Depending on the needed temperature measurement range and the associated accuracy, we suggest two methods to access to the NTC resistance values.
1
NTC resistance in at temperature T in K NTC resistance in at rated temperature in K Temperature in K B value, material-specific constant of the NTC thermistor Base of natural logarithm (e = 2,71828)
The actual characteristic of an NTC thermistor can, however, only be roughly described by the exponential relation, as the material parameter B in reality also depends on temperature. So this approach is only suitable for describing a restricted range around the rated temperature or resistance with sufficient accuracy.
2 For practical applications a more precise description of the real R/T curve may be required. Either more complicated approaches (e.g the Steinhart-Hart equation) are used or the resistance/temperature relation as given in tabulated from. These standardized curves have been experimentally determined with utmost accuracy ; they are aslo available for temperature increments of 1 degree.
Humirel Sensor Device Data / HPC008 Rev E September 2002
52000 40500 31000 24500 19300 15400 12350 10000 8140
TECHNICAL 3 DATA
SUGGESTED EVALUATION CIRCUIT FOR HUMIDITY FREQUENCY
AND TEMPERATURE ANALOG OUTPUTS
Relative humidity (Frequency output)
This circuit is a typical Astable design for 555. The HTS2010 is used as a variable capacitor and provides an output frequency modulation with relative humidity ranging from 0% to 100%. In this frequency output circuit configuration (for capacitance measurement), R1 unbalances the internal temperature compensation scheme of the 555. It shifts the negative initial temperature coefficient of the 555 to a positive one that matches the humidity sensing chip's temperature coefficient of - 1.4Hz/C. In all cases, R1 should be a 1 % resistor with a maximum of 100ppm temperature coefficient like all other R-C timer resistors.
Resistors values
Since 555 internal temperature compensation changes from manufacturer to manufacturer, R1 and R2 values should be adapted to device to be used. 555 TLC555 (Texas) TS555 (STM) 7555 (Harris) LMC555 (National) R1 909k 100nF capacitor 1732k 1238k For a frequency of 6660Hz at 55%RH R2 576k 523k 549k 562k
Temperature (voltage output)
The temperature measurement is done by a voltage divider, RV2 must be adjusted to get 2.5 V at 25C as temperature measurement.
Polarization
In order to get better reproducibility during measurement, always connect pin 4 (see the package outline on page 4) to the ground of the circuit.
Soldering instructions
See application note HPC 034 VO
Humirel Sensor Device Data / HPC008 Rev E September 2002
TECHNICAL 4 DATA
*
* * * * * * * * *
QUALIFICATION PROCESS
* 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 / automative or consumer applications.
HTS2010SMD 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 body & Machine model Salt Atmosphere MIL STD750/Method 1041/96 hours Temperature Cycling - -40C / +70C
* *
ENVIRONMENTAL AND RECYCLING INFORMATION : PACKAGE OUTLINE HTS2010SMD GULL WING (JLEAD option also available).
* HTS2010SMD sensors are lead free components * HTS2010SMD sensors are free of Cr (VI), Cd and Hg.
*
RECOMMENDED FOOTPRINT
All dimensions in mm Scale 1:1
Dimension mm (typical)
A 6
B 10
C 2.7
D
E
F
G
H
L
0.8 2.54 12.8 0-7 0.2 0.1
A Reel Diameter 360 mm Reel Width 30.4 mm Carrier Tape 24 mm
B Carrier Tape Pitch 4 mm
C Carrier Tape Depth 4 mm
Direction of feed
B
Cross Section
A
Standard : EIA 481-1 CEI 60286-3 ORDERING INFORMATION OF HTS2010 SMD : * HPP804B100 (TUBE M.P.Q. OF 80 PIECES). * HPP804B101 (TAPE AND REEL M.P.Q. OF 1500 PIECES). TEMPERATURE AND RELATIVE HUMIDITY SENSORS.
C
SAMPLE KIT OF HTS2010 SMD 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 semiconductor 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. Customer's technical experts must validate all operating parameters, including "Typical" for each customer application. 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, subsidiaries, affiliates and distributors harmless against all claims, costs, damages and expenses, and reasonable attomey fees arising out of, directly or indirectly, any claim of personal 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 registered trademark of Humirel.
Humirel Sensor Device Data / HPC008 Rev E September 2002

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