HS401x Datasheet

R36DS0023EU0104 Rev.1.04

Mar 14, 2023

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

Figure 4. HS4013 RH Accuracy over Temperature ................................................................................................7

Figure 5. HS4011 Temperature Sensor Accuracy Tolerance .................................................................................7

Figure 6. HS4013 Temperature Sensor Accuracy Tolerance .................................................................................7

Figure 7. Timing Diagram .......................................................................................................................................8

Figure 8. START and STOP Condition Waveform..................................................................................................9

Figure 9. Typical Hold Measurement Sequence for a Humidity and Temperature Command..............................11

Figure 10. Typical No-Hold Measurement Sequence for a Humidity and Temperature Command ......................12

Figure 11. Sequence to Retrieve the Latest Results in Periodic Measurement Mode ..........................................14

Figure 12. Sequence to Stop Periodic Measurements .........................................................................................14

Figure 13. Alert Pin Function ................................................................................................................................15

Figure 14. Alert Pin Functionality Example...........................................................................................................15

Figure 15. Data Returned from HS401x when the Alert Feature is Enabled in Periodic Measurement Mode ......16

Figure 16. Read Register Command Sequence ...................................................................................................17

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

Figure 18. Read Sensor ID Command Sequence ................................................................................................21

Figure 19. HS401x Application Circuit (Top View)................................................................................................21

Figure 20. Recommended Soldering Profile.........................................................................................................22

Figure 21. 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 .............................................................................................................................8

Table 4. Commands Code and Description............................................................................................................9

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