HTS221 I2C STOPS WORKING

[unnati811]

Posted on June 13, 2016 at 07:51

Hi, I'm using the HTS221 with STM8L052C6. The communication channel is I2C.

I am able to get the humidity data upto 99% RH. but above this after some point of reading the data,the sensor gets hanged and is not recoverable even after circuit is reset. i also found SDA line remains low in this condition. Any help would be greatly appreciated! thanks, unnati

[licciardello.anto]

Posted on June 15, 2016 at 10:53Hi,I need additional information.What setting are you using ?One shot?? ODR?? and so on.Are you getting  measurements on not controlled environment or on controlled enviroment with RH saturated to 100%?After how long the device fails?Do you have check only one device or more??RegardsAntonella

[unnati811]

Posted on June 17, 2016 at 13:38

hi,

i am getting  measurements on controlled enviroment with RH saturated to 100%. i have checked with 2 devices and the same problem occurs for both. the device fails approx 15 mins. after reaching 99% RH. i read the data from sensor every 10 sec and everytime i initialize and deinitialize the sensor with following settings: for initializing HTS221 ,i write CTRL_REG1 = 0x80;   CTRL_REG2 = 0x01; for DEINITIALIZING HTS221, i write CTRL_REG1 = 0x00; the supply to the sensor is always on. regards unnati

[licciardello.anto]

Posted on June 20, 2016 at 14:25

Hi,

the used settings seem good. You should keep in consideration that in this situation it is very likely to create condensation. I guess the failure is related to malfunctions, short circuits and so on of the used interface (board, wiring, etc.) and not to the device itself. I reccomend you to pay attention to this aspect. Regards Antonella

[LaRue.Dan]

Posted on May 31, 2018 at 13:48

Hi,

This problem may be related to time and not percent humidity.

Since ONE-SHOT mode is used and the sensors is being powered down with the PD bit, see topic

https://community.st.com/0D50X00009XkVvtSAF

Good luck!