low drive, Low frequency I/O in nrf52832

[pail]

hi dev

Thanks to all your answers to my questions, my project has become very easy.

Today's question is the same as the subject : low drive, Low frequency I/O

During my c program, I am in the process of pin assignment and learned about "low drive, Low frequency I/O "

In 52832 datasheet, there are 10 pin of "Low drive, low frequency I/O only" from P0.22 to P0.31.

 and I was able to check the following information.

 - Low frequency I/O is a signal with a frequency up to 10 kHz.

 - Radio performance parameters, such as sensitivity, may be affected by high frequency digital I/O with large sink/source current close to the Radio power supply and antenna pins.

So I checked that "low drive, Low frequency I/O" is a port related to radio, or rf communication.

in my project, I don't use rf, rf communication and NFC. I only use ble as beacon receiver. 

what I'm wondering is that it is possible to assign this low frequency I/O with gpio pins such as led on/off or switched on/off?

[Priyanka]

Hi Paul,

Some pins are mentioned as Low drive, low frequency I/O only not because of their capability or because they are connected to rf. It's just that these pins are placed really close to the radio and assigning them as high frequency might interfere with the transmission and reception. It might be possible to assign them as high frequency, but we cannot guarantee the proper working.

Best Regards,

Priyanka

[pail]

Hi, Priyanka.

Thank you for your answer.

I'm asking you to check, but is Bluetooth low energy also a kind of radio?

[Priyanka]

Hi Paul,

No problem. Happy to help.

They can be used for LEDs or switches, just make sure that they do not exceed 10kHz when using the radio. And even though you are not using RF communication or NFC, the BLE utilizes the radio, so disruption can happen.

-Priyanka