ETC2 HS1101LF Relative humidity sensor Datasheet

HS1101LF Relative Humidity
Sensor
DESCRIPTION
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
maximum ratings
Lead Free Components
Ratings
Full Interchangeability with no
calibration required in standard
conditions
Symbol
Value
Unit
Ta
-60 to 140
°C
Storage Temperature
Tstg
-60 to 140
°C
Supply Voltage (Peak)
Vs
10
Vac
Humidity Operating Range
RH
0 to 100
% RH
Operating Temperature
Instantaneous desaturation after long
periods in saturation phase
Compatible with automatized
assembly processes, including Pb free
wave soldering and reflow processes (1)
Operating Range
High Reliability and Long Term
Stability
100
90
80
Patented Solid Polymer Structure
Relative Humidity in % RH
70
Suitable for linear voltage or
frequency output circuitry
Fast response time and very low
temperature coefficient
60
50
40
30
20
Part may be washed with distilled
water
10
0
-60
-40
-20
0
20
40
60
80
100
Temperature in °C
Individual marking for compliance to
stringent traceability requirements
(1) Soldering temperature profiels available upon
request/contact us at [email protected]
Measurement Specialties, Inc.
1000 Lucas Way Hampton, VA 23666 USA
-1-
www.meas-spec.com
757-766-1500
800-745-8008
Fax 757-766-4297
120
140
160
HS1101LF Relative Humidity Sensor
C h a r a c t e r i s t i c s ( Ta = 2 5 º C , m e a s u re m e n t f re q u e n c y @ 1 0 k H z u n l e s s o t h e r w i s e s t a t e d )
Characteristics
Symbol
Min
Humidity metrology range
RH
1
Voltage supply
Vs
Nominal capacitance @ 55% RH
C
Temperature coefficient
Typ
177
180
Tcc
Unit
99
% RH
10
V
183
pF
0.01
C /% RH
Averaged Sensitivity from 33% to 75% RH
Max
pF/°C
0.31
Leakage current (Vcc=5 Volts)
I
Recovery time after 150 hours of condensation
tr
10
t
+/-0.5
pf/% RH
1
nA
s
Humidity Hysteresis
+/-1
Long term stability
τα
Time constant (33 to 80% RH, still air, @ 63%)
3
Deviation to typical response curve (10% to 90%) RH)
% RH
% RH/yr
5
s
+/-2
% RH
Ty p i c a l re s p o n s e l o o k - u p t a b l e ( P o l y n o m i a l R e f e re n c e c u r v e ) 1 0 k H z / 1 V
RH (%)
0
5
10
15
20
25
30
35
40
45
50
Cp (pF)
161.6
163.6
165.4
167.2
169.0
170.7
172.3
173.9
175.5
177.0
178.5
RH (%)
55
60
65
70
75
80
85
90
95
100
Cp (pF)
180
181.4
182.9
184.3
185.7
187.2
188.6
190.1
191.6
193.1
Polynomial response of HS1101LF:
C (pF)=C@55 %*( 3.903 10-8 *RH3-8.294 10-6 *RH2+2.188 10-3 *RH+0.898)
Reversed Polynomial response of HS1101LF:
RH (%) = -3.4656 10+3 *X3+1.0732 10-4 *X2-1.0457 10+4 *X+3.2459 10+3
With X=C(read) / C@55%RH
P ro p o r t i o n a l Vo l t a g e O u t p u t C i rc u i t
Block Diagram
Measurement Specialties, Inc.
1000 Lucas Way Hampton, VA 23666 USA
-2-
www.meas-spec.com
757-766-1500
800-745-8008
Fax 757-766-4297
HS1101LF Relative Humidity Sensor
F re q u e n c y O u t p u t C i rc u i t s
Note: R22=499kS /
R4=49.9S? / R1=1 kS /
RV1=50 kS 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/(thigh+tlow) = 1/(C@%RH*(R4+2*R22)*ln2)
- 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.
Ty p i c a l re s p o n s e l o o k - u p t a b l e ( H u m i d i t y O u t p u t )
RH (%)
0
5
Fout (Hz)
RH (%)
Fout (Hz)
10
15
20
25
30
35
40
45
50
7155
7080
7010
6945
6880
6820
6760
6705
6650
100
55
60
65
70
75
80
85
90
95
6600
6550
6500
6450
6400
6355
6305
6260
6210
Measurement Specialties, Inc.
1000 Lucas Way Hampton, VA 23666 USA
-3-
www.meas-spec.com
757-766-1500
800-745-8008
Fax 757-766-4297
HS1101LF Relative Humidity Sensor
M e a s u re m e n t E r ro r v s S t r a y C a p a c i t a n c e
-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.
Q u a l i f i c a t i o n P ro c e s s
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(260°C) + DI water clean at 45°C
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 - 40°C / +125°C
High Temperature / Humidity Operating Life - 93%RH / 60°C for 1000 hours
Low Humidity storage life - RH < 10%/23°C - 1000 hours
Resistance to immersion in water at ambient temperature and 80°C
High temperature storage 140°C 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. HS1101LF sensors are
free from Cr (6+), Cd and Hg.
O rd e r i n g I n f o r m a t i o n : H S 1 1 0 1 L F
Package Outline HS1101LF
HS1101LF: HPP801A031 (MULTIPLE PACKAGE QUANTITY OF 48 PIECES)
CAPACITIVE RELATIVE HUMIDITY SENSOR.
Dimensions in millimeters
Measurement Specialties, Inc.
1000 Lucas Way Hampton, VA 23666 USA
-4-
www.meas-spec.com
757-766-1500
800-745-8008
Fax 757-766-4297
HS1101LF-0407
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