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
Ratings
Symbol
Value
Unit
Operating Temperature
T
a
-40 to 100
C
Storage Temperature
Tstg
-40 to 125
C
Supply Voltage
Vs 10 Vac
Humidity Operating Range
RH
0 to 100
% RH
Soldering @ T = 260C
t
10
s
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
Temperature coefficient
T
cc
0.04
pF/C
Averaged Sensitivity from 33% to 75% RH
C/%RH
0.34
pF/%RH
Leakage current (Vcc = 5 Volts)
I
x
1
nA
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
RELA
TIVE HUMIDITY IN %
STEADY ST
A
TE
100
PEAK CONDITIONS
* Tighter specification available on request
HPC001 Rev. 7 June 2002
1
2
HS 1100
Top opening
HS 1101
Side opening
TECHNICAL DATA
2
C
HARACTERISTICS (CONT'D)
P
ROPORTIONAL VOLTAGE OUTPUT CIRCUIT
160
165
170
175
180
185
190
capacitance (in pF)
0
10
20
30
40
50
60
70
80
90
100
195
200
205
% RH
Typical 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%*(1.2510-7RH3-1.3610-5RH2+2.1910-3RH+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
Typical Characteristics for Voltage Output Circuit
At Vcc 5V - 25C
Reference Oscillator
Sensor Oscillator
L.P. Filter
Gain
Vout
Vout=Vcc*(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
Voltage (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
5
6
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 :
thigh = C@%RH*(R2+R4)*ln2
tlow = C@%RH*R2*ln2
F = 1/(thigh+tlow) = 1/(C@%RH*(R4+2*R2)*ln2)
Output duty cycle = thigh*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
Typical 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 :
Fmes(Hz) = F55(Hz)(1.1038-1.936810
-3*RH+3.011410-6*RH2-3.440310-8*RH3)
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
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
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 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
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
PACKAGE
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
PACKAGE
OUTLINE
HS1101
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