SHT21 datasheet(2/12 Pages) SENSITRON

2 / 12 page

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Version 1.0 – January 2010

2/12

Sensor Performance

Relative Humidity1234

Parameter

Condition

min

typ

max

Units

12 bit

0.04

%RH

Resolution 1

8 bit

0.7

%RH

typ

2.0

%RH

Accuracy

tolerance 2

max

see Figure 2

%RH

Repeatability

0.1

%RH

Hysteresis

1

%RH

Nonlinearity

<0.1

%RH

Response time 3

 63%

Operating Range extended 4

100

%RH

Long Term Drift 5

normal

< 0.5

%RH/yr

± 0

± 2

± 4

± 6

± 8

± 10

100

Relative Humidity (%RH)

RH (%RH)

maximal tolerance

typical tolerance

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

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

Electrical Specification

Parameter

Conditions min

typ

max Units

Supply Voltage, VDD

2.1

3.0

3.6

sleep mode

0.15

0.4

µA

Supply Current, IDD 6

measuring

270

300

330

µA

sleep mode

0.5

1.2

µW

measuring

0.8

0.9

1.0

Power Dissipation 6

average 8bit

1.5

µW

Heater

VDD = 3.0 V

5.5mW, T = + 0.5-1.5°C

Communication

digital 2-wire interface, true I2C protocol

Table 1

Electrical specification. For absolute maximum

values see Chapter 3 of Users Guide.

1 Default measurement resolution is 14bit (temperature) / 12bit (humidity). It can

be reduced to 12/8bit, 11/11bit or 13/10bit by command to user register.

2 Accuracies are tested at Outgoing Quality Control at 25°C (77°F) and 3.0V.

Values exclude hysteresis and non-linearity and are applicable to non-

condensing environments only.

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

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

reversible offset with slow kinetics (<3%RH after 200hours at 90%RH). For more

details please see Section 1.1 of the Users Guide.

Temperature567

Parameter

Condition

min

typ

max

Units

14 bit

0.01

°C

Resolution 1

12 bit

0.04

°C

typ

0.3

°C

Accuracy

tolerance 2

max

see Figure 3

°C

Repeatability

0.1

°C

-40

125

°C

Operating Range extended 4

-40

257

°F

Response Time 7

 63%

Long Term Drift

< 0.04

°C/yr

± 0.0

± 0.5

± 1.0

± 1.5

± 2.0

± 2.5

± 3.0

-40

-20

100

120

Temperature (°C)

T (°C)

Figure 3 Maximal tolerance for temperature sensor in °C.

Packaging Information

Sensor Type

Packaging

Quantity

Order Number

Tape & Reel

400

1-100707-01

Tape & Reel

1500

1-100645-01

SHT21

Tape & Reel

5000

1-100694-01

This datasheet is subject to change and may be amended

without prior notice.

5 Value may be higher in environments with vaporized solvents, out-gassing

tapes, adhesives, packaging materials, etc. For more details please refer to

Handling Instructions.

6 Min and max values of Supply Current and Power Dissipation are based on

fixed VDD = 3.0V and T<60°C. The average value is based on one 8bit

measurement per second.

7 Response time depends on heat conductivity of sensor substrate.

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