www.sensirion.com / D1

Version 1.0 – May 2025

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Contents

1 Quick Start – Hello World................................................................................................................................................................ 3

2 Humidity and Temperature Sensor Specifications ................................................................................................................ 4

2.1 Relative Humidity..................................................................................................................................................................... 4

2.2 Relative Humidity Accuracy at the Extended Temperature Range....................................................................... 5

2.3 Temperature............................................................................................................................................................................... 5

2.4 Recommended Operating Conditions............................................................................................................................. 7

2.5 Design In...................................................................................................................................................................................... 7

3 Functional Safety Documentation................................................................................................................................................ 7

4 Electrical Specifications .................................................................................................................................................................... 8

4.1 Timings......................................................................................................................................................................................... 9

4.2 Absolute Maximum Ratings................................................................................................................................................. 9

5 Sensor Operation..............................................................................................................................................................................10

5.1 I2C Communication...............................................................................................................................................................10

5.1.1 I2C Communication Timing.................................................................................................................................10

5.2 I2C Data type & length........................................................................................................................................................10

5.3 I2C Checksum Calculation ..................................................................................................................................................11

5.4 I2C Command Overview......................................................................................................................................................12

5.5 Conversion of Signal Output .............................................................................................................................................12

5.6 Serial Number..........................................................................................................................................................................13

5.7 I2C Heater Operation ...........................................................................................................................................................13

5.8 Possible Heater Use Cases..................................................................................................................................................13

5.9 Important notes for operating the heater:...................................................................................................................14

5.10 Reset............................................................................................................................................................................................14

6 Physical Specification......................................................................................................................................................................14

6.1 Package Description..............................................................................................................................................................14

6.2 Package Outline......................................................................................................................................................................15

6.3 Land Pattern.............................................................................................................................................................................15

6.4 Pin Assignment & Laser Marking ....................................................................................................................................16

6.5 Thermal Information .............................................................................................................................................................16

7 Quality and Material Contents ....................................................................................................................................................17

8 Tape and Reel Packaging ..............................................................................................................................................................18

9 Product Nomenclature ...................................................................................................................................................................18

10 Ordering Information......................................................................................................................................................................19

11 Bibliography........................................................................................................................................................................................20

Revision History.........................................................................................................................................................................................21

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