Problem with communication

[Heratix]

Hello,

I built own device  (band) using nrf51822. It's works great. 

But I want exchange Chip to nRF52832. I built device using elements and layout from datasheet nrf52832. I can programing IC, GPIO works great, but I have problem witch BLE communication.

I can't see my device.  I suppose program is correct (I'm using SDK example and functions not return errors). I think problem can be with pcb.

So I'm sending some pictures. Please tell my, that pcb is correct or no?

Antenna, which I used call RFECA3216060A1T and I used the same model in previous model (works good).

And I used 1pF instead 0,8pF in C3 capacitor, because I had only that value.

Thank you in advance,
Bartek

[Andreas]

Hi,

 

A couple issues:

• There are no components for matching the antenna, without it will radiate less energy.
• The RF path does not pass over solid ground, instead the SWDIO pad and a thermal relieved GND pad. This might reduce the output power.
• Have you made sure the loading caps for the 32MHz crystal are approximately 2*CL - 4 pF,  CL being specified for your crystal?

 

Do you get a connection if you place the phone right next to the board? Do you see any transmission if using the nRF Connect RSSI viewer?

 

Best regards,

Andreas

[Heratix]

Thank you for answer Andreas,

In next version I will correct it.

I suppose where is the problem. I put 16MHz crystal instead 32MHz. Previously I was working with nrf51822 and it is reason my mistake.

I apologize for my problem.

I'll write if it's working when I checked it.

Best regards,

Bartek

[Andreas]

Hi,

 

Yes, nRF52 requires a 32 MHz crystal. No worries, I suppose it is an easy mistake to make if you are used to nRF51. The good thing is it should be fairly easy to fix your boards.

 

Best regards,

Andreas

[Heratix]

I exchanged crystal . Right now is working. Thanks!