Sensor Performance
Relative Humidity1234
Temperature567
Parameter
Parameter
Condition min
typ max Units
Condition min
typ
0.01
max Units
12 bit
8 bit
typ
0.04
0.7
%RH
%RH
14 bit
12 bit
typ
°C
°C
°C
°C
°C
Resolution 1
Resolution 1
0.04
%RH
Accuracy
tolerance 2
2.0
see Figure 2
0.1
Accuracy
tolerance 2
0.3
see Figure 3
0.1
max
%RH
max
Repeatability
Hysteresis
%RH
Repeatability
-40
125
257
30
°C
°F
%RH
1
<0.1
Operating Range extended 4
-40
5
Nonlinearity
Response time 3
%RH
Response Time 7
Long Term Drift
s
8
s
63%
63%
Operating Range extended 4
0
100 %RH
%RH/yr
< 0.04
°C/yr
Long Term Drift 5
normal
< 0.5
T (°C)
RH (%RH)
± 10
± 8
± 6
± 4
± 2
± 0
± 3.0
± 2.5
± 2.0
± 1.5
± 1.0
± 0.5
± 0.0
maximal tolerance
typical tolerance
0
10 20 30 40 50 60 70 80 90 100
-40
-20
0
20
40
60
80
100
120
Relative Humidity (%RH)
Temperature (°C)
Figure 3 Maximal tolerance for temperature sensor in °C.
Figure 2 Typical and maximal tolerance at 25°C for relative
humidity. For extensive information see Users Guide, Sect. 1.2.
Packaging Information
Electrical Specification
Sensor Type
Packaging
Tape & Reel
Tape & Reel
Tape & Reel
Quantity
400
Order Number
1-100707-01
1-100645-01
1-100694-01
Parameter
Conditions min typ max Units
2.1 3.0 3.6
0.15 0.4 µA
270 300 330 µA
0.5 1.2 µW
0.8 0.9 1.0 mW
1.5 µW
5.5mW, T = + 0.5-1.5°C
Supply Voltage, VDD
V
SHT21
1500
sleep mode
measuring
-
Supply Current, IDD 6
Power Dissipation 6
5000
sleep mode
measuring
-
average 8bit
VDD = 3.0 V
-
-
Heater
Communication
digital 2-wire interface, true I2C protocol
This datasheet is subject to change and may be amended
without prior notice.
Table 1 Electrical specification. For absolute maximum
values see Chapter 3 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
5
Accuracies are tested at Outgoing Quality Control at 25°C (77°F) and 3.0V.
Value may be higher in environments with vaporized solvents, out-gassing
Values exclude hysteresis and non-linearity and are applicable to non-
condensing environments only.
tapes, adhesives, packaging materials, etc. For more details please refer to
Handling Instructions.
3
6
Time for achieving 63% of a step function, valid at 25°C and 1 m/s airflow.
Min and max values of Supply Current and Power Dissipation are based on
4
fixed VDD = 3.0V and T<60°C. The average value is based on one 8bit
measurement per second.
Normal operating range: 0-80%RH, beyond this limit sensor may read a
reversible offset with slow kinetics (<3%RH after 200hours at 90%RH). For more
details please see Section 1.1 of the Users Guide.
7
Response time depends on heat conductivity of sensor substrate.
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Version 1.0 – January 2010
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