Light sensitivity of LPS33HW waterproof pressure sensors

[NBake.3]

Hi, I have an application that suggests the pressure sensors are very sensitive to sunlight.

1. I have noticed the same behaviour. Can anyone confirm if the sensor experiences a photo-electric effect that amplifies the signal current within the sensor?

Images below are of a device with two LPS33HW sensors mounted in orthogonal directions being dipped in and out of water. In the first case this is done inside under ambient light, in the second it is outside in direct sunlight.

 

2. In some cases we have observed the sensor measurement circuit appears to lock up but the digital line continues to output the last known value. Can anyone confirm the following: I suspect the Analog circuit has experienced some overcurrent and has shut itself down, but the digital line remains powered and keeps reporting the last known value.

Can anyone confirm this behaviour?

 

[Eleon BORLINI · Accepted solution]

Hi @NBake.3​ ,

please check this thread and the related suggestions.

-Eleon