light sensitive of nRF52832 WLCSP package

RE: light sensitive of nRF52832 WLCSP package

ketiljo — Fri, 16 Feb 2024 15:33:26 GMT

Unless you direct the IR light directly into the hole, it shouldn't be a problem. The only effect you are likely to see, is increased current draw when it's exposed to strong IR light.

RE: light sensitive of nRF52832 WLCSP package

franck — Thu, 15 Feb 2024 16:27:37 GMT

Hello, I'm interested by third party module (fanstell/raytac) that are shielded but as shielding are not full closed worried of any problem with it.

I am wondering as IR signal can go through these kind of holes, as my enclosure is transparent and device receive infrared pulse code to infrared receiver installed on same board.

I don't use any analog device does this mean I will not have any problem. Or some analog part is used for RF or anything

Exemple below is not WLCSP but just here for explaining small holes on shield

Thanks Franck

RE: light sensitive of nRF52832 WLCSP package

ketiljo — Mon, 15 Nov 2021 11:45:06 GMT

Visible light has no impact. IR light can have impact on the analog modules if the light is powerful enough. The silicon is opaque to IR light and the photons in the light will affect the transistors. Just like a photo diode or transistor where this effect is used by purpose.

If he device is inside an housing, it's usually more than enough to block the IR light. If the housing doesn't filter the IR light, the device can be covered with IR blocking epoxy.