www.sensirion.com / D1

Version 3.3 – November 2024

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Contents

1 Measurement specifications........................................................................................................................................................... 3

1.1 Concentration of CO2 in Air or N2 ..................................................................................................................................... 3

1.2 Low-noise measurement mode specifications............................................................................................................. 4

2 Sensor specifications......................................................................................................................................................................... 5

2.1 Sensitivity to compensation inputs of low-cross-sensitivity mode...................................................................... 5

2.2 Temperature............................................................................................................................................................................... 5

2.3 Electrical specifications .......................................................................................................................................................... 5

2.4 Timings......................................................................................................................................................................................... 5

2.5 Mechanical specifications ..................................................................................................................................................... 6

2.6 Materials ...................................................................................................................................................................................... 6

2.7 Absolute minimum and maximum ratings .................................................................................................................... 6

3 Sensor operation................................................................................................................................................................................. 6

3.1 I2C addresses.............................................................................................................................................................................. 6

3.2 I2C sequences............................................................................................................................................................................. 7

3.3 I2C commands ........................................................................................................................................................................... 8

3.4 Checksum calculation...........................................................................................................................................................16

3.5 Conversion to physical values...........................................................................................................................................17

4 Physical specifications.....................................................................................................................................................................18

4.1 Package outline.......................................................................................................................................................................18

4.2 Land pattern.............................................................................................................................................................................18

4.3 Pin assignment........................................................................................................................................................................19

5 Shipping package.............................................................................................................................................................................20

6 Ordering information......................................................................................................................................................................20

7 Product revision notice...................................................................................................................................................................21

8 Revision history .................................................................................................................................................................................22