www.sensirion.com / D1

Version 1 – June 2025

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Contents

1 Measurement Specifications .......................................................................................................................................................... 3

1.1 CO2 Sensing Performance..................................................................................................................................................... 3

2 Sensor Specifications ........................................................................................................................................................................ 4

2.1 Recommended Environmental Conditions .................................................................................................................... 4

2.2 Electrical Specifications.......................................................................................................................................................... 4

2.3 Absolute Maximum Ratings................................................................................................................................................. 5

2.4 Hardware Interface Specifications..................................................................................................................................... 5

2.5 Temperature and Humidity Compensation................................................................................................................... 6

2.6 Timing Specifications.............................................................................................................................................................. 6

2.7 Mechanical Specifications..................................................................................................................................................... 6

2.8 Material Specifications........................................................................................................................................................... 6

3 Sensor Operation................................................................................................................................................................................ 7

3.1 I2C Address.................................................................................................................................................................................. 7

3.2 I2C Data Transfer Formats..................................................................................................................................................... 7

3.3 Checksum Calculation ............................................................................................................................................................ 8

3.4 I2C Commands........................................................................................................................................................................... 8

3.5 Conversion of Signal Input and Output ........................................................................................................................13

4 Physical Specification......................................................................................................................................................................15

4.1 Package Description..............................................................................................................................................................15

4.2 Package Outline......................................................................................................................................................................15

4.3 Land Pattern.............................................................................................................................................................................15

4.4 Traceability and Identification...........................................................................................................................................16

4.5 Soldering Instructions ..........................................................................................................................................................16

5 Tape and Reel Packaging ..............................................................................................................................................................17

6 Ordering Information......................................................................................................................................................................17

7 Revision History.................................................................................................................................................................................17