HS401x Datasheet

R36DS0023EU0103 Rev.1.03

Jun 6, 2022

Page 3

List of Figures

Figure 1. HS4011 RH Accuracy Tolerance at 25°C................................................................................................7

Figure 2. HS4011 RH Accuracy over Temperature ................................................................................................7

Figure 3. HS4012 RH Accuracy Tolerance at 25°C................................................................................................7

Figure 4. HS4012 RH Accuracy over Temperature ................................................................................................7

Figure 5. HS4013 RH Accuracy Tolerance at 25°C................................................................................................7

Figure 6. HS4013 RH Accuracy over Temperature ................................................................................................7

Figure 7. HS4014 RH Accuracy Tolerance at 25°C................................................................................................8

Figure 8. HS4014 RH Accuracy over Temperature ................................................................................................8

Figure 9. HS4011/HS4012 Temperature Sensor Accuracy Tolerance ...................................................................8

Figure 10. HS4013 Temperature Sensor Accuracy Tolerance ...............................................................................8

Figure 11. HS4014 Temperature Sensor Accuracy Tolerance ...............................................................................8

Figure 12. Timing Diagram .....................................................................................................................................9

Figure 13. START and STOP Condition Waveform..............................................................................................10

Figure 14. Typical Hold Measurement Sequence for a Humidity and Temperature Command ............................11

Figure 15. Typical No-Hold Measurement Sequence for a Humidity and Temperature Command ......................12

Figure 16. Sequence to Retrieve the Latest Results in Periodic Measurement Mode ..........................................14

Figure 17. Sequence to Stop Periodic Measurements .........................................................................................14

Figure 18. Alert Pin Function ................................................................................................................................15

Figure 19. Alert Pin Functionality Example...........................................................................................................15

Figure 20. Data Returned from HS401x when the Alert Feature is Enabled in Periodic Measurement Mode ......16

Figure 21. Read Register Command Sequence ...................................................................................................17

Figure 22. Write Register Command Sequence ...................................................................................................17

Figure 23. Read Sensor ID Command Sequence ................................................................................................21

Figure 24. HS401x Application Circuit (Top View)................................................................................................21

Figure 25. Recommended Soldering Profile.........................................................................................................22

Figure 26. Milled PCB Openings for Thermal Isolation.........................................................................................23

List of Tables

Table 1. Humidity Sensor Specification, TA = +25°C, VDD = 1.71V to 3.6V.............................................................6

Table 2. Temperature Sensor Specification, TA = +25°C, VDD = 1.71V to 3.6V ......................................................6

Table 3. I2C Timing Parameters .............................................................................................................................9

Table 4. Commands Code and Description..........................................................................................................10

Table 5. Measurement Command Modes ............................................................................................................10

Table 6. Conversion Times...................................................................................................................................13

Table 7. CRC Checksum Properties.....................................................................................................................13

Table 8. Alert Status Bits ......................................................................................................................................16

Table 9. Temperature and Humidity Measurement Resolution Settings...............................................................18

Table 10. Periodic Measurement Settings............................................................................................................18

Table 11. Alert Feature Settings...........................................................................................................................18