SHT25_15 datasheet(2/14 Pages) ETC2

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Version 3 – May 2014

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Sensor Performance

Relative Humidity

Parameter

Condition

Value

Units

Resolution1

12 bit

0.04

%RH

8 bit

0.7

%RH

Accuracy tolerance2

typ

1.8

%RH

max

see Figure 2

%RH

Repeatability

0.1

%RH

Hysteresis

1

%RH

Nonlinearity

<0.1

%RH

Response time3

 63%

Operating Range

extended4

0 to 100

%RH

Long Term Drift5

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.

Packaging Information

Sensor Type

Packaging

Quantity

Order Number

SHT25

Tape & Reel

400

1-100769-01

Tape & Reel

1500

1-100768-01

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 and 3.0V. Values

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

environments only.

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

4 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.

5 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.

Temperature

Parameter

Condition

Value

Units

Resolution1

14 bit

0.01

°C

12 bit

0.04

°C

Accuracy tolerance2

typ

0.2

°C

max

see Figure 3

Repeatability

0.1

°C

Operating Range

extended4

-40 to 125

°C

Response Time6

 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 Maximal tolerance for temperature sensor in °C.

Electrical Specification

Parameter

Conditions min

typ

max Units

Supply Voltage, VDD

2.1

3.0

3.6

Supply Current, IDD8

sleep mode

0.15

0.4

µA

measuring

200

300

330

µA

Power Dissipation8

sleep mode

0.5

1.2

µW

measuring

0.6

0.9

1.0

average 8bit

3.2

µW

Heater

VDD = 3.0 V

5.5mW,

DT = + 0.5-1.5°C

Communication

digital 2-wire interface, I2C protocol

Table 1

Electrical specification. For absolute maximum

values see Section 4.1 of Users Guide.

This datasheet is subject to change and may be amended

without prior notice.

6 Response time depends on heat conductivity of sensor substrate.

7 Max. value is < 0.04°C/y.

8 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.

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