Further Information .............................................13
Figure 1
Functional block diagram of the SHT3x-ARP. The
sensor signals for humidity and temperature are factory
calibrated, linearized and compensated for temperature
and supply voltage dependencies.
Content
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September 2018 - Version 3
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Datasheet SHT3x-ARP
1
Sensor Performance
Parameter
SHT30 Accuracy tolerance
1
SHT31 Accuracy tolerance
1
Repeatability
2
Resolution
Integrated Non-Linearity
3
Hysteresis
Specified range
4
Response time
6
Long-term drift
Sensitivity
Humidity Sensor Specification
Conditions
Typ.
Max.
Typ.
Max.
Typ.
Typ.
at 25°C
extended
5
63%
Typ.
7
V
DD
=2.4 V
V
DD
=3.3V
V
DD
=5.0V
V
DD
=5.5V
Value
3
Figure 2
2
Figure 3
0.1
0.01
0.2
0.8
0 to 100
8
<0.25
19.2
26.4
40.0
44.0
Units
%RH
-
%RH
-
%RH
%RH
%RH
%RH
%RH
s
%RH/yr
mV/%RH
mV/%RH
mV/%RH
mV/%RH
Table 1
Humidity sensor specification
Temperature Sensor Specification
Parameter
SHT30 Accuracy tolerance
1
SHT31 Accuracy tolerance
1
Repeatability
2
Resolution
Specified Range
Response time
8
Long Term Drift
Condition
Typ., 0°C to 65°C
Typ., 0°C to 90°C
Typ.
-
63%
Max.
V
DD
=2.4 V
V
DD
=3.3V
V
DD
=5.0V
V
DD
=5.5V
Value
0.3
0.3
0.06
0.01
-40 to 125
>2
<0.03
11.0
15.1
22.9
25.1
Units
°C
°C
°C
°C
°C
s
°C/yr
mV/°C
mV/°C
mV/°C
mV/°C
Sensitivity
Table 2
Temperature sensor specification
1
For definition of typical and maximum accuracy tolerance, please refer to the document “Sensirion Humidity Sensor Specification Statement”.
2
The
stated repeatability is 3 times the standard deviation (3σ) of multiple consecutive measurements at constant ambient conditions. It is a measure for the noise on
the physical sensor output. It is measured with analog circuit and integrated over 1 second.
3
Maximum deviation from the ideal shape (linear curve)
4
Specified range refers to the range for which the humidity or temperature sensor specification is guaranteed.
5
For details about recommended humidity and temperature operating range, please refer to section 1.1.
6
Time for achieving 63% of a humidity step function, valid at 25°C and 1m/s airflow. Humidity response time in the application depends on the design-in of the sensor.
7
Typical value for operation in normal RH/T operating range, see section 1.1. Maximum value is < 0.5 %RH/yr. Value may be higher in environments with vaporized
solvents, out-gassing tapes, adhesives, packaging materials, etc. For more details please refer to Handling Instructions.
response times strongly depends on the design-in of the sensor in the final application. Minimal response time can be achieved when the thermalized
sensor at T1 is placed on a well conducting surface with temperature T2.
8
Temperature
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Datasheet SHT3x-ARP
Humidity Sensor Performance Graphs
SHT30
DRH
(%RH)
±8
±6
±4
±2
±0
0
SHT30
10
20
30
40
50
60 70 80 90 100
Relative Humidity (%RH)
maximal tolerance
typical tolerance
±8
±6
±4
±2
±0
0
10
SHT31
20
30
40
50
60 70 80 90 100
Relative Humidity (%RH)
DRH
(%RH)
maximal tolerance
typical tolerance
SHT31
Figure 2
Tolerance of RH at 25°C for SHT30
SHT30
RH (%RH)
100
±4.5 ±4.5 ±4.5 ±4.5
±4.5
±4.5 ±4.5 ±4.5 ±4.5
90
±3
±3
±3
±3
±3
±3
±3
±3
±3
80
±3
±3
±3
±3
±3
±3
±3
±3
±3
70
±3
±3
±3
±3
±3
±3
±3
±3
±3
60
±3
±3
±3
±3
±3
±3
±3
±3
±3
50
±3
±3
±3
±3
±3
±3
±3
±3
±3
40
±3
±3
±3
±3
±3
±3
±3
±3
±3
30
±3
±3
±3
±3
±3
±3
±3
±3
±3
20
±3
±3
±3
±3
±3
±3
±3
±3
±3
10
±3
±3
±3
±3
±3
±3
±3
±3
±3
0
±4.5 ±4.5 ±4.5 ±4.5
±4.5
±4.5 ±4.5 ±4.5 ±4.5
0
10
20
30
40
50
60
70
80
Temperature (°C)
Figure 3
Tolerance of RH at 25°C for SHT31
SHT31
RH (%RH)
100
±2
90
±2
80
±2
70
±2
60
±2
50
±2
40
±2
30
±2
20
±2
10
±2
0
±2
0
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
10
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
20
30
40
50
Temperature (°C)
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
60
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
70
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
±2
80
Figure 4
Typical tolerance of RH over T for SHT30
Figure 5
Typical tolerance of RH over T for SHT31
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Datasheet SHT3x-ARP
Temperature Sensor Performance Graphs
SHT30
DT
(°C)
±1.5
maximal tolerance
typical tolerance
±1.0
±1.0
DT
(°C)
±1.5
maximal tolerance
typical tolerance
SHT31
±0.5
±0.5
±0.0
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
±0.0
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Figure 6
Temperature accuracy of the SHT30 sensor at
Figure 7
Temperature accuracy of the SHT31 sensor at
VDD = 4.5V…5.5V.
VDD = 4.5V…5.5V.
1.1
Recommended Operating Condition
The sensor shows best performance when operated within recommended normal temperature and humidity range of 5 –
60 °C and 20 – 80 %RH, respectively. Long term exposure to conditions outside normal range, especially at high humidity,
may temporarily offset the RH signal (e.g. +3%RH after 60h at >80%RH). After returning into the normal temperature and
humidity range the sensor will slowly come back to calibration state by itself. Prolonged exposure to extreme conditions
may accelerate ageing. To ensure stable operation of the humidity sensor, the conditions described in the document
“SHTxx_STSxx Assembly of SMD Packages”, section “Storage and Handling Instructions” regarding exposure to volatile
organic compounds have to be met. Please note as well that this does apply not only to transportation and manufacturing,
but also to operation of the SHT3x-ARP.
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Datasheet SHT3x-ARP
2
2.1
Specifications
Electrical Specifications
Symbol
V
DD
V
POR
Parameter
Supply voltage
Power-up/down level
Condition
Min
2.4
1.8
Typ.
3.3
2.3
Max
5.5
2.4
Units Comments
V
V
Voltage changes on the
VDD line between
V
DD,min
and V
DD,max
V/ms should be slower than
the maximum slew rate;
faster slew rates may
lead to reset
A
A
kOhm
Capacitance that can be
driven by the sensor on
the signal lines. The
typical value is
recommended for
improved EMC
robustness.
At resistive load 1MOhm
Slew rate change of the
supply voltage
V
DD,slew
-
-
20
Average at T=25°C
Supply current
Resistive load to VSS
I
DD
R
L
Average at
T=125°C
-
-
50
220
270
>1000
300
-
-
Capacitive load
C
L
1
3.9
5
nF
Table 3
Electrical specifications, typical values are valid for T=25°C, min. & max. values for T=-40°C … 125°C.
2.2
Timing Specification for the Sensor System
Symbol
t
PU
Parameter
Power-up time
Conditions
After hard reset,
V
DD
≥ V
POR
Min.
-
Typ.
-
Max.
17
Units Comments
Time between V
DD
reaching
ms V
POR
and first measurement
signal available
Time needed for adapting to a
changing supply voltage and
measurement value. Value
ms
depends on output load.
Typical value is for a load of
1nF.
us See section 3.3
Analog output settling time
AO
settle
For a step of VDD/2
-
0.3
Duration of reset pulse
t
RESETN
1
-
-
Table 4
System Timing Specification, valid from -40 °C to 125 °C and 2.4 V to 5.5 V.
2.3
Absolute Minimum and Maximum Ratings
Stress levels beyond those listed in Table 5 may cause permanent damage to the device or affect the reliability of the
sensor. These are stress ratings only and functional operation of the device at these conditions is not guaranteed. Ratings
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