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Version 1 – March 2022

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Table of Contents

1

Sensor Performance .........................................................................................................................................3

1.1

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

1.2

Humidity Sensing Performance ...................................................................................................................3

1.3

Temperature Sensing Performance.............................................................................................................3

2

Specifications ....................................................................................................................................................4

2.1

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

2.2

Absolute Maximum Ratings.........................................................................................................................4

2.3

Interface Specifications ...............................................................................................................................5

2.4

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

2.5

Material Contents ........................................................................................................................................6

3

Digital Interface Description.............................................................................................................................7

3.1

Power-Up and Communication Start ...........................................................................................................7

3.2

Data type & length.......................................................................................................................................7

3.3

Command Sequence Types........................................................................................................................7

3.4

SCD42 Command Overview .......................................................................................................................8

3.5

Basic Commands ........................................................................................................................................9

3.6

On-Chip Output Signal Compensation ......................................................................................................10

3.7

Field Calibration ........................................................................................................................................13

3.8

Advanced Features ...................................................................................................................................15

3.9

Checksum Calculation...............................................................................................................................17

4

Mechanical specifications ..............................................................................................................................18

4.1

Package Outline ........................................................................................................................................18

4.2

Land Pattern..............................................................................................................................................18

4.3

Tape & Reel Package................................................................................................................................19

4.4

Moisture Sensitivity Level..........................................................................................................................19

4.5

Soldering Instructions................................................................................................................................20

4.6

Traceability................................................................................................................................................20

5

Ordering Information.......................................................................................................................................20

6

Revision History ..............................................................................................................................................20