Data Sheet

www.sensirion.com Version 3 – December 2011 2/14
Sensor Performance
Relative Humidity
1234
Parameter
Condition
min
typ
max
Units
Resolution
1
12 bit
0.04
%RH
8 bit
0.7
%RH
Accuracy
tolerance
2
typ
3.0
%RH
max
see Figure 2
%RH
Repeatability
0.1
%RH
Hysteresis
1
%RH
Nonlinearity
<0.1
%RH
Response time
3
63%
8
s
Operating Range
extended
4
0
100
%RH
Long Term Drift
5
normal
< 0.5
%RH/yr
Figure 2 Typical and maximal tolerance at 25°C for relative
humidity. For extensive information see Users Guide, Sect. 1.2.
Electrical Specification
Parameter
Condition
min
typ
max
Units
Supply Voltage, VDD
2.1
3.0
3.6
V
Supply Current, IDD
6
sleep mode
0.15
0.4
µA
measuring
200
300
330
µA
Power Dissipation
6
sleep mode
0.5
1.2
µW
measuring
0.6
0.9
1.0
mW
average 8bit
3.2
µW
Heater
VDD = 3.0 V
5.5mW, T = + 0.5-1.5°C
Communication
digital 2-wire interface, I
2
C protocol
Table 1 Electrical specification. For absolute maximum
values see Section 4.1 of Users Guide.
1
Default measurement resolution is 14bit (temperature) / 12bit (humidity). It can
be reduced to 12/8bit, 11/11bit or 13/10bit by command to user register.
2
Accuracies are tested at Outgoing Quality Control at 25°C and 3.0V. Values
exclude hysteresis and long term drift and are applicable to non-condensing
environments only.
3
Time for achieving 63% of a step function, valid at 25°C and 1m/s airflow.
4
Normal operating range: 0-80%RH, beyond this limit sensor may read a
reversible offset with slow kinetics (+3%RH after 60h at humidity >80%RH). For
more details please see Section 1.1 of the Users Guide.
Temperature
567
Parameter
Condition
min
typ
max
Units
Resolution
1
14 bit
0.01
°C
12 bit
0.04
°C
Accuracy
tolerance
2
typ
0.3
°C
max
see Figure 3
°C
Repeatability
0.1
°C
Operating Range
extended
4
-40
125
°C
Response Time
7
63%
5
30
s
Long Term Drift
< 0.04
°C/yr
Figure 3 Typical and maximal tolerance for temperature sensor
in °C.
Packaging Information
Sensor Type
Packaging
Quantity
Order Number
SHT20
Tape & Reel
1500
1-100706-01
Tape & Reel
5000
1-100704-01
This datasheet is subject to change and may be amended
without prior notice.
5
Value may be higher in environments with vaporized solvents, out-gassing
tapes, adhesives, packaging materials, etc. For more details please refer to
Handling Instructions.
6
Min and max values of Supply Current and Power Dissipation are based on
fixed VDD = 3.0V and T<60°C. The average value is based on one 8bit
measurement per second.
7
Response time depends on heat conductivity of sensor substrate.
± 0
± 2
± 4
± 6
± 8
± 10
0 10 20 30 40 50 60 70 80 90 100
DRH (%RH)
Relative Humidity (%RH)
maximal tolerance
typical tolerance
± 0.0
± 0.5
± 1.0
± 1.5
± 2.0
-40 -20 0 20 40 60 80 100 120
DT ( C)
Temperature (°C)
maximal tolerance
typical tolerance