HS400x Datasheet

R36DS0022EU0103 Rev.1.03

Jun 6, 2022

Page 2

Contents

1.

Pin Information .............................................................................................................................................4

1.1

Pin Assignments ...................................................................................................................................4

1.2

Pin Descriptions....................................................................................................................................4

2.

Specifications ...............................................................................................................................................5

2.1

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

2.2

Recommended Operating Conditions...................................................................................................5

3.

Humidity and Temperature Sensor Performance ......................................................................................6

3.1

Humidity Sensor Specification ..............................................................................................................6

3.2

Temperature Sensor Specification .......................................................................................................6

3.3

Humidity Sensor Accuracy Graphs.......................................................................................................7

3.4

Temperature Sensor Accuracy Graphs ................................................................................................8

4.

Sensor Interface ...........................................................................................................................................8

4.1

I2C Features and Timing.......................................................................................................................9

4.2

Sensor Slave Address ..........................................................................................................................9

4.3

I2C Communication...............................................................................................................................9

4.4

Measurements and Commands..........................................................................................................11

4.4.1.

Performing a Hold Measurement..........................................................................................11

4.4.2.

Performing a No-Hold Measurement....................................................................................12

4.4.3.

Calculating Humidity and Temperature Output.....................................................................12

4.4.4.

Measurement Conversion Times..........................................................................................13

4.4.5.

CRC Checksum Calculation.................................................................................................13

4.5

Periodic Measurement Mode..............................................................................................................13

4.6

Alert Feature.......................................................................................................................................14

4.6.1.

Alert Pin – Measurement Active ...........................................................................................14

4.6.2.

Alert Pin – Humidity and Temperature Threshold Detection ................................................15

4.7

Accessing Configurable HS400x Registers ........................................................................................16

4.7.1.

Read Register Command .....................................................................................................17

4.7.2.

Write Register Command .....................................................................................................17

4.8

Configuration Bits ...............................................................................................................................18

4.8.1.

Setting the Measurement Resolution ...................................................................................18

4.8.2.

Periodic Measurement Settings............................................................................................18

4.9

Reading the Sensor ID Number..........................................................................................................20

5.

Application Circuit......................................................................................................................................21

6.

Soldering Information ................................................................................................................................21

7.

PCB Layout Guide ......................................................................................................................................23

8.

Storage and Handling.................................................................................................................................23

9.

Quality and Reliability ................................................................................................................................23

10. Package Outline Drawings.........................................................................................................................24

11. Ordering Information..................................................................................................................................24

12. Revision History .........................................................................................................................................24