SHT21P 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

± 0

± 2

± 4

± 6

± 8

± 10

100

Relative Humidity (%RH)

DRH (%RH)

maximum accuracy

typical accuracy

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

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

Electrical Specification

Parameter

Condition

min

typ

max Units

Supply Voltage, VDD

2.1

3.0

3.6

Supply Current, IDD 5

180

µA

Power Dissipation 5

0.54

PWM frequency

40 °C

108

120

132

Temperature drift of

PWM frequency

-0.07

-0.12 Hz/°C

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 Drift7

Typ.

< 0.02

°C/yr

± 0.0

± 0.5

± 1.0

± 1.5

± 2.0

-40

-20

100

120

Temperature (°C)

DT (°C)

maximum accuracy

typical accuracy

Figure 3 Typical and maximal temperature accuracy tolerance

Packaging Information

Sensor Type

Packaging

Quantity

Order Number

SHT21P

Tape & Reel

400

1-100711-01

Tape & Reel

1500

1-100700-01

Tape & Reel

5000

1-100699-01

This datasheet is subject to change and may be amended

without prior notice.

4 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.

6 Response time depends on heat conductivity of sensor substrate.

7 Max. value is < 0.04°C/y.

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