Datasheet SHT20 (Sensirion) - 3

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Users Guide SHT20 1 Extended Specification
such as a dew point mirror. Typical deviations are at ±2 %RH where maximal tolerance is ±3% RH and about For details on how Sensirion is specifying and testing half the maximal tolerance at other values. accuracy performance please consult Application Note “Statement on Sensor Specification”.
1.3 Electrical Specification
Current consumption as given in Table 1 is dependent on
1.1 Operating Range
temperature and supply voltage VDD. For estimations on The sensor works stable within recommended Normal energy consumption of the sensor Figures 6 and 7 may be Range – see Figure 4. Long term exposure to conditions consulted. Please note that values given in these Figures outside Normal Range, especially at humidity >80 %RH, are of typical nature and the variance is considerable. may temporarily offset the RH signal (+3 %RH after 60 h). After return into the Normal Range it will slowly return 8 towards calibration state by itself. Prolonged exposure to
A) (μ
7 extreme conditions may accelerate ageing.
D D
6
It
5
en )
100
rr %( u
4 90
C y it y
80
l
3
id p m
70
p
2
u Su H
60
e
1 50 Normal Max.
iv at
Range Range 0 40
el R
30 0 20 40 60 80 100 120 20
Temperature (°C)
10 0
Figure 6
Typical dependency of supply current (sleep mode) -40 -20 0 20 40 60 80 100 120 versus temperature at VDD = 3.0 V. Please note that the
Temperature (°C)
variance of these data can be above ±25% of displayed value.
Figure 4
Operating Conditions
)
20
A 1.2 RH accuracy at various temperatures (n
18
D
Typical RH accuracy at 25°C is defined in Figure 2. For
DI
16
t
other temperatures, typical accuracy has been evaluated
enr
14
r
to be as displayed in Figure 5
u
.
C
12
y lpp
10 100 ±4.5 ±4 ±4 ±4 ±4 ±4 ±4.5 ±5 ±5
Su
8
]
90 ±4.5 ±4 ±3.5 ±3.5 ±3.5 ±3.5 ±4 ±4.5 ±5
H R
80 ±4 ±3.5 ±3 ±3 ±3 ±3.5 ±3.5 ±4 ±4.5 6
% [
70 ±4 ±3.5 ±3 ±3 ±3 ±3 ±3.5 ±3.5 ±4 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5
yit
60 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3.5 ±3.5
id Supply Voltage (VDD) m
50 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3.5
u Figure 7
Typical dependency of supply current (sleep mode)
H
40 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3
e
versus supply voltage at 25°C. Please note that deviations may
ivt
30 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3 ±3 be up to ±50% of displayed value. Values at 60°C scale with a
lae
20 ±3.5 ±3.5 ±3 ±3 ±3 ±3 ±3 ±3 ±3
R
factor of about 15 (compare Table 1). 10 ±4 ±4 ±3.5 ±3.5 ±3.5 ±3.5 ±3.5 ±3.5 ±3.5 0 ±4.5 ±4.5 ±4 ±4 ±4 ±4 ±4 ±4 ±4 0 10 20 30 40 50 60 70 80
Temperature [°C]
.
Figure 5
Typical accuracy of relative humidity measurements given in %RH for temperatures 0 – 80°C. Please note that above values are maximal tolerances (not including hysteresis) against a high precision reference www.sensirion.com Version 5 – October 2022 3/14