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Datasheet SHT7x
www.sensirion.com
Version 4.1 – July 2008
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Sensor Performance
Relative Humidity12
Parameter
Condition
min
typ
max
Units
0.5
0.03
0.03
%RH
Resolution1
8
12
12
bit
typ
±3.0
%RH
Accuracy2
SHT71
max
see Figure 2
typ
±1.8
%RH
Accuracy2
SHT75
max
see Figure 2
Repeatability
±0.1
%RH
Replacement
fully interchangeable
Hysteresis
±1
%RH
raw data
±3
%RH
Nonlinearity
linearized
<<1
%RH
Response time3
tau 63%
8
s
Operating Range
0
100
%RH
Long term drift4
normal
< 0.5
%RH/yr
SHT71
SHT75
± 0
± 2
± 4
± 6
0
10
20
30
40
50
60
70
80
90
100
Relative Humidity (%RH)
Figure 2: Maximal RH-tolerance at 25°C per sensor type.
Electrical and General Items
Parameter
Condition
min
typ
max
Units
Source Voltage
2.4
3.3
5.5
V
sleep
2
5
W
measuring
3
mW
Power
Consumption5
average
150
W
Communication
digital 2-wire interface, see Communication
Storage
10 – 50°C (0 – 80°C peak), 20 – 60%RH
1 The default measurement resolution of is 14bit for temperature and 12bit for
humidity. It can be reduced to 12/8bit by command to status register.
2 Accuracies are tested at Outgoing Quality Control at 25°C (77°F) and 3.3V.
Values exclude hysteresis and non-linearity.
3 Time for reaching 63% of a step function, valid at 25°C and 1 m/s airflow.
Temperature45
Parameter
Condition
min
typ
max
Units
0.04
0.01
0.01
°C
Resolution1
12
14
14
bit
typ
±0.4
°C
Accuracy2
SHT71
max
see Figure 3
typ
±0.3
°C
Accuracy2
SHT75
max
see Figure 3
Repeatability
±0.1
°C
Replacement
fully interchangeable
-40
123.8
°C
Operating Range
-40
254.9
°F
Response Time 6
tau 63%
5
30
s
Long term drift
< 0.04
°C/yr
SHT71
SHT75
± 0.0
± 0.5
± 1.0
± 1.5
± 2.0
± 2.5
± 3.0
-40
-20
0
20
40
60
80
100
Temperature (°C)
Figure 3: Maximal T-tolerance per sensor type.
Packaging Information
Sensor Type
Packaging
Quantity
Order Number
SHT71
Tape Stripes
50
1-100092-04
SHT75
Tape Stripes
50
1-100071-04
4 Value may be higher in environments with high contents of volatile organic
compounds. See Section 1.3 of Users Guide.
5 Values for VDD=5.5V at 25°C, average value at one 12bit measurement
per second.
6 Response time depends on heat capacity of and thermal resistance to
sensor substrate.
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