Hi. I've developed a PCB with nRF52832 and I'm having problems with the circuit. When I put my hands closelly of P0.00(XL1) and P0.01(XL2) the bahavior of nRF changes... I'm not using external crystal in these pins. I'm using then as IO'

[Anderson Silva]

Hi. I've developed a PCB with nRF52832 and I'm having problems with the circuit. When I put my hands closelly of P0.00(XL1) and P0.01(XL2) the bahavior of nRF changes... I'm not using external crystal in these pins. I'm using then as IO's. P0.00 as output and P0.01 a input
Does anyone have any idea of what is happening?
I've done the layout a little bit different of what was suggested by the datasheet... Could it be the reason? Or maybe the configuration of oscilator?
The circuit SCH and some prints of PCB are showed bellow.






top layer
bottom layer

[Marjeris Romero]

Hi,

What do you mean when you say that the behaviour of the nRF chip changes? Can you be more specific?

[Anderson Silva]

Hi.
I've implemented a firmware (in MBED) that just blink som leds in the pins P0.25 till P0.28. And when I transfer (program) it in the nRF52, the application doesn't run (nothing happens). So when I put my fingers very close of pins "2-P0.00" and "3-P0.01" the applications runs very well... and the leds bliink perfectly.
As I told before I'm not using the LFCLK (lower frequence crystal) in these pins (2-P0.00 e 3-P0.01)... So I believe that I should to configure these pins as IO and configure de LFCLKSRC to be a samplerate from HFCLK...
I hope be clear now.

[Marjeris Romero]

Anderson Silva said:

So I believe that I should to configure these pins as IO and configure de LFCLKSRC to be a samplerate from HFCLK...

 Hi,

Yes, you need to configure the pins as GPIO if you are using them as GPIO, and configure the LFCLKSRC to either use the internal RC oscillator (recommended if using SoftDevice) or synthesized from HLCK.