SHT21S datasheet(2/10 Pages) ETC2

2 / 10 page

www.sensirion.com

Version 4 – May 2014

2/10

Sensor Performance

Relative Humidity123

Parameter

Condition

Value

Units

Resolution

12 bit

0.04

%RH

Accuracy

tolerance 1

typ

2.0

%RH

max

see Figure 2

%RH

Repeatability

0.1

%RH

Hysteresis

1

%RH

Nonlinearity

<0.1

%RH

Response time 2

 63%

Operating Range extended 3

0 to 100

%RH

Long Term Drift 4

Typ.

< 0.25

%RH/yr

Figure 2 Typical and maximal tolerance at 25°C for relative

humidity. For extensive information see Users Guide, Sect. 1.2.

For electronic impacts on accuracy please consult Sect. 5.3.

Electrical Specification

Parameter

Condition

min

typ

max Units

Supply Voltage, VDD

2.1

3.0

3.6

Supply Current, IDD 5

160

µA

Power Dissipation 5

0.48

Measurement

Frequency

Switch RH/T on SDA SCL up  RH; SCL down  T

Table 1

Electrical specification. For absolute maximum

values see Chapter 4.1 of Users Guide.

1 Accuracies are tested at Outgoing Quality Control at 25°C and 3.0V. Values

exclude hysteresis and long term drift and are applicable to non-condensing

environments only.

2 Time for achieving 63% of a step function, valid at 25°C and 1 m/s airflow.

3 Normal operating range: 0-80%RH, beyond this limit sensor may read a

reversible offset with slow kinetics (+3%RH after 60h at humidity >80%RH). For

more details please see Section 1.1 of the Users Guide.

Temperature456

Parameter

Condition

Value

Units

Resolution

14 bit

0.01

°C

Accuracy

tolerance 1

typ

0.3

°C

max

see Figure 3

°C

Repeatability

0.1

°C

Operating Range extended 3

-40 to 125

°C

Response Time 6

 63%

5 to 30

Long Term Drift 7

Typ.

< 0.02

°C/yr

Figure 3 Typical and maximal temperature accuracy tolerance.

For electronic impacts on accuracy please consult Sect. 5.3.

Packaging Information

Sensor Type

Packaging

Quantity

Order Number

SHT21S

Tape & Reel

400

1-100718-01

Tape & Reel

1500

1-100697-01

Tape & Reel

5000

1-100696-01

This datasheet is subject to change and may be amended

without prior notice.

4 Typical value for operation in normal RH/T operating range. Max. value is < 0.5

%RH/y. Value may be higher in environments with vaporized solvents, out-

gassing tapes, adhesives, packaging materials, etc. For more details please

refer to Handling Instructions.

5 Values of Supply Current and Power Dissipation are based upon fixed VDD =

3.0V and T = 25°C applying a low pass filter as proposed in Sect. 5.3.

6 Response time depends on heat conductivity of sensor substrate.

7 Max. value is < 0.04°C/y.

± 0

± 2

± 4

± 6

± 8

± 10

100

ΔRH(%RH)

Relative Humidity (%RH)

maximum accuracy

typical accuracy

± 0.0

± 0.5

± 1.0

± 1.5

± 2.0

-40

-20

100

120

ΔT (

C)

Temperature (°C)

maximum accuracy

typical accuracy

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