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Parameter

Symbol

Typ.

Max.

Units

Comments

Low-cross-sensitivity

mode recommended

sampling frequency

1

7

Hz

A higher readout frequency (limited

by measurement duration) will lead

to self-heating and should be

consistent during FRC as well as

measurement.

Low-noise mode

recommended sampling

frequency

1

10

Hz

2.5 Mechanical specifications

Parameter

Symbol

Typ.

Max.

Units

Comments

Weight

W

0.025

g

2.6 Materials

Parameter

REACH, RoHS

REACH and RoHS compliant

2.7 Absolute minimum and maximum ratings

Parameter

Rating

Units

Supply Voltage VDD

-0.3 to 5.5

V

Max Voltage on pins (SDA, SCL)

-0.3 to VDD+0.3

V

Input current on any pin

±70

mA

Operating temperature range

-40 to +105

°C

Maximum short term storage temperature range

-40 to +105

°C

Recommended storage temperature range

-10 to +40

°C

Operating absolute pressure range

200 to 2000

mbar

Max. humidity for long term exposure

40 °C dew point

ESD HBM (human body model)

2

kV

Media Compatibility

Noncorrosive gases

3

Sensor operation

The STC3x interface is compatible with the I2C protocol in Standard-mode, Fast-mode and Fast-mode Plus.

Clock stretching is not supported. This chapter describes the command set for STC31-C. For detailed

information about the I2C protocol, please check the document "NXP I2C-bus specification and user manual".

3.1 I2C addresses

The address is followed by a read or write bit. See section 4.3.3 for selecting alternative I2C addresses.

I2C address

in hex. representation

Binary representation

default

0x29

b 010 1001

selectable

0x2A

b 010 1010

selectable

0x2B

b 010 1011

selectable

0x2C

b 010 1100