Review PCB design for nrf52840 for Matter or Thread use

[Sarvesh_dhar]

Hi, I am new to PCB design, so I want suggestions for my designed PCB. Please review it once and provide feedback upon that. I am making this PCB to use this with Thread and matter-related products. I have used EasyEda to design the PCB and used the reference designs provided by Nordic. 

 nRF52840 PCB & Antenna Design 

 General PCB design guidelines for nRF52 series 

[Jared]

Hi,

1. On the SWD header you want to route out VCC not 3V3, so that it follows whatever voltage VCC is at. 
2. You need a full Pi-network to tune your antenna. Only C15 is not enough. 
3. DEC4_DEC6 node is connected to the wrong node. It should be over capacitors of the DC/DC components.
4. You need decoupling on pin A22.
5. Pullup on Reset pin is not necessary.
6. What is the internal capacitance of your HFXO and LFXO crystals?

For the PCB you need to follow the reference design much more closely. Where is your GND layer?

regards

Jared 

[Sarvesh_dhar]

Hi, Thanks for the response, I have updated the design with the Gnd. I will update here after changing the other points you have mentioned . Would you please look into this once and find any improvements

 

[Jared]

Hi,

Can you share the Gerber files?

regards

Jared 

[Sarvesh_dhar]

Gerber_PCB_nrf52840_2024-04-06.zipHi, Sorry for being late. Here I have attached the gerber file of my design 

[Sarvesh_dhar]

Hi I have updated the design bit more Here I am attaching the Gerber file for that as well .

Gerber_PCB_nrf52840_2024-04-06 (1).zip

[Sarvesh_dhar]

[Sarvesh_dhar]

I have tried to tune the trace of Antenna as well to 50 ohm , please verify that as well