topic Re: Moisture detection using NX20P0477UKZ in Power Management

Moisture detection using NX20P0477UKZ

kadamm — Fri, 25 Sep 2026 17:16:15 GMT

Hello Team,

We have developed custom board using P/N: NX20P0477UKZ. We are not able to detect moisture detection.

In our design we are using 1.5meter cable to connect Mobile phone. So one end of cable is connected with our custom board and other end of cable is exposed to external world for Mobile connection.

So when we try to detect moisture from cable which is exposed to external world. we are not able to detect moisture. Please guide us to resolve this issue.

Thanks

Re: Moisture detection using NX20P0477UKZ

RafaR — Fri, 25 Sep 2026 22:33:40 GMT

Hello kadamm

Good day!

The NX20P0477 is intended to operate when no device is connected, and its main purpose is to prevent connection under moisture conditions by asserting FLAGB beforehand.

Once a cable or device is connected (a mobile phone is connected even via a cable), the electrical conditions on the CC lines become more complex, and the presence of water together with an active connection introduces unpredictable behavior. Therefore, the device cannot reliably distinguish or detect moisture events under these conditions.

I hope this information has helped you, please let me know if you need help with anything else.

Have a great day and best of luck.

Re: Moisture detection using NX20P0477UKZ

kadamm — Mon, 28 Sep 2026 04:16:14 GMT

Hello Rafar.

Thanks for your quick response.

We are performing test without connection of any device. As per our application, we are connecting one of cable to our on board type c connector and other end of cable is left opened. We are dipping opened end of cable into water but Flag pin (C1) is always high and not able to detect moisture.

We are making CP_EN(B2) pin as high to detect moisture.

Could you please suggest us how can we validate functionality?

Thanks