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CO2 Sensor - STC31

• High reliability and long-term stability
• Best signal-to-noise ratio
• Industry-proven technology with a track record of more than 15 years
• Designed for mass production
• High process capability

Model Number: STC31
Data Sheet:

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Product Specification

Product Summary：

The STC3x sensor family is Sensirion’s series of Gas Concentration sensors designed for high-volume applications. The STC3x utilizes a revolutionized thermal conductivity measurement principle, which results in superior repeatability and long-term stability.

This make the STC31 a perfect choice for applications where reliability is key.

The sensor features a digital I²C interface, which makes it easy to connect directly to a microprocessor.

The outstanding performance of these sensors is based on Sensirion’s patented CMOSens® sensor technology, which combines the sensor element, signal processing and digital calibration on a small CMOS chip. The well-proven CMOS technology is perfectly suited for high-quality mass production and is the ideal choice for demanding and cost-sensitive OEM applications.

Benefits of Sensirion’s CMOSens® Technology：

• High reliability and long-term stability

• Best signal-to-noise ratio

• Industry-proven technology with a track record of more than 15 years

• Designed for mass production

• High process capability

Specifications：

1.Electrical Specifications

Parameter	Symbol	Condition	Min.	Typ.	Max.	Units	Comments
Supply Voltage	V_DD		2.7	3.3	5.5	V	Sensor is calibrated at 3.3V
Power-up/down level	V_POR		2.3	2.5	2.7	V
Supply current	I_DD	Measuring		3	5	mA
		Idle state		50		uA
		Sleep mode			1	uA

2.Timings

Parameter	Symbol	Condition	Min.	Typ.	Max.	Units	Comments
Power-up time	t_PU				14	ms	Time to sensor ready
Soft reset time	t_SR				12	ms	Time between soft reset command or exit sleep mode and sensor ready
I²C SCL frequency	f_I2C			400	1000	kHz
Measurement time concentration					66	ms	Measurement result is returned together with temperature value

3.Mechanical Specifications

Parameter	Symbol	Condition	Min.	Typ.	Max.	Units	Comments
Weight	W				0.025	g

4.Materials

Parameter
REACH, RoHS	REACH and RoHS compliant

5.Absolute Minimum and Maximum Ratings^（1）

Parameter	Rating	Units
Supply Voltage V_DD	-0.3 to 5.5	V
Max Voltage on pins (SDA, SCL)	-0.3 to V_DD+0.3	V
Input current on any pin	±70	mA
Operating temperature range	-20 to +85	℃
Storage temperature range	-20 to +85	℃
Operating absolute pressure range	600 to 1200	mbar
Max. humidity for long term exposure	40℃ dew point
ESD HBM (human body model)	2	kV
Media Compatibility	Non corrosive gases