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Version 2 – August 2016

3/14

1.1 RH Accuracy at Various Temperatures

Typical RH accuracy at 25°C is defined in Figure 2. For

other temperatures, typical accuracy has been evaluated

to be as displayed in Figure 4.

Figure 4 Typical accuracy of relative humidity measurements

given in %RH for temperatures 0 – 80°C.

1.2 Recommended Storage and Operating

Conditions

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 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 SHTW2.

2 Electrical Specifications

2.1 Electrical Characteristics

Default conditions of 25 °C and 1.8 V supply voltage apply to values in the table below, unless otherwise stated.

Parameter

Symbol

Conditions

Min

Typ.

Max

Units Comments

Supply voltage

-

1.62

1.8

1.98

V

-

Power-up/down level

Static power supply

1.05

1.2

1.35

V

-

Supply current

Idle state

-

0.7

1.5

µA -

Measurement

-

385

465

µA

Average current consumption

Average

-

4.8

-

µA

Average current consumption

(continuous operation with one

measurement per second)10

Power consumption

-

Average

-

8.6

-

µW

Average power consumption

(continuous operation with one

measurement per second) 10

Low level input voltage

-

-0.5

-

V

-

High level input voltage

-

-

+ 0.5

V

-

Low level output voltage

3 mA sink current

-

-

-

-

Table 3 Electrical specifications.

2.2 Absolute Maximum Ratings

Stress levels beyond those listed in Table 4 may cause permanent damage to the device. These are stress ratings only and

functional operation of the device at these conditions cannot be guaranteed. Exposure to the absolute maximum rating

conditions for extended periods may affect the reliability of the device.

±4

±4

±4

±5

80

±3

70

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

±3

10

±4

±4

±4

±4

±4

±4

±4

0

10

20

30

40

50

60

70

80

Temperature [°C]