www.sensirion.com / D1

Version 7.1 – March 2025

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Contents

1 Quick Start Guide................................................................................................................................................................................ 3

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

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

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

2.2 Temperature............................................................................................................................................................................... 6

2.3 Recommended Operating Conditions............................................................................................................................. 7

2.4 ISO17025 certification with 3-point calibration data................................................................................................. 8

2.5 Design In...................................................................................................................................................................................... 8

3 Electrical Specifications .................................................................................................................................................................... 9

3.1 Timings.......................................................................................................................................................................................10

3.2 Absolute Maximum Ratings...............................................................................................................................................10

4 Sensor Operation..............................................................................................................................................................................11

4.1 I2C Communication...............................................................................................................................................................11

4.2 I2C Communication Timing ...............................................................................................................................................11

4.3 Data type & length................................................................................................................................................................11

4.4 Checksum Calculation ..........................................................................................................................................................11

4.5 Command Overview..............................................................................................................................................................12

4.6 Conversion of Signal Output .............................................................................................................................................12

4.7 Serial Number..........................................................................................................................................................................13

4.8 Reset & Abort..........................................................................................................................................................................13

4.9 Heater Operation ...................................................................................................................................................................13

5 Physical Specification......................................................................................................................................................................15

5.1 Package Description..............................................................................................................................................................15

5.2 Package Outline......................................................................................................................................................................15

5.3 Land Pattern.............................................................................................................................................................................16

5.4 Pin Assignment & Laser Marking ....................................................................................................................................16

5.5 Thermal Information .............................................................................................................................................................17

6 Protection Options...........................................................................................................................................................................17

6.1 Membrane Option .................................................................................................................................................................17

6.2 Protective Cover .....................................................................................................................................................................18

7 Quality and Material Contents ....................................................................................................................................................18

8 Tape and Reel Packaging ..............................................................................................................................................................19

9 Nomenclature ....................................................................................................................................................................................20

10 Ordering Information......................................................................................................................................................................21

11 Bibliography........................................................................................................................................................................................21

12 Revision History.................................................................................................................................................................................22