nRF52832 custom board Able to upload code but it's not run internally after power-up board.

RE: nRF52832 custom board Able to upload code but it's not run internally after power-up board.

JONATHAN LL — Fri, 08 Oct 2021 08:48:58 GMT

And also: check out the blog we have here for more info:
General PCB design guidelines for nRF52 series - Hardware design, test and measurement - nRF5 SDK guides - Nordic DevZone (nordicsemi.com)

And

nRF52832 Specific PCB Guidelines - Hardware design, test and measurement - nRF5 SDK guides - Nordic DevZone (nordicsemi.com)

Regards,
Jonathan

RE: nRF52832 custom board Able to upload code but it's not run internally after power-up board.

JONATHAN LL — Fri, 08 Oct 2021 08:47:15 GMT

Hi AB,

The crystal you have selected is ok, you can read on the specs required here for HFXO. I also believe that the issue is with wrong pads on the footprint.

You can see in our ref design that we have connected the to unused ads to GND, in some datasheets we often see that they recommend to leave the to unused pads floating. But generally from what i have seen it is preferable to connect to ground.

You can download the latest version of the nrf52832 here, and use it as reference.

Regards,
Jonathan

RE: nRF52832 custom board Able to upload code but it's not run internally after power-up board.

AB-Mangukiya — Thu, 07 Oct 2021 18:02:29 GMT

Thanks for Review in detail,

Yes I need to do more hardwork on layout and update PCB board based on guidline of nRF52 Document.

can you confirm please crystal is that correct and can i use 32 MHz ±10ppm Crystal 12pF 50 Ohms 4-SMD, No Lead P/N below ( I got issue of crystal pad we use 1 and 2 pad with OSC1 and OSC2 but its 1 and 3 pin)

https://www.digikey.in/en/products/detail/murata-electronics/XRCGB32M000F1S1DR0/14542537

That one crystal have pin 1 and 3 is crystal terminal and pin 2/4 is Not connected so is that ok ??

I will reupload soon after all changes done.

Thanks.

AB.

RE: nRF52832 custom board Able to upload code but it's not run internally after power-up board.

JONATHAN LL — Mon, 04 Oct 2021 09:22:32 GMT

Hi,

I have looked at your PCB layout and there are some major issues here. I highly recommend that you have a look at the guidelines we have.
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/ref_circuitry.html?cp=4_2_0_52_1#schematic_qfn48_dcdc
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/ref_circuitry.html?cp=4_2_0_52_6#pcb_guidelines
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/ref_circuitry.html?cp=4_2_0_52_7#layout

Also in the schematic the micro controller is labeled nRF52832, but in the gerber files names the nrf52840 is used:

Some feedback on the HW layout:

1. The antenna is placed in the middle of the board, with no keep-out area. It also does not have a transmission line that is a co-planar wave guide. And it is obstructed by other components on all side's.

2. The crystal is not properly grounded, and are you sure you have connected to the correct pads of the crystal?

3. There is no grounding vias on the center pad here, performance will not be ok.

In general the grounding is terrible, in the design as you have it now the ground loops will be very bad resulting in more noise and poor performance for both radio but also power delivery. The antenna should be placed in on corner or on one side of the pcb with no obstruction on at least 3 sides. I recommend that you follow the exact layout that is in the data sheet of the antenna.

You should fill both top layer and bottom layer with copper and use vias to stich the to layer together for bet ground.

I propose that you maybe try to use nrfjprog to talk to your device.

You can use commands like nrfjprog --program, --recover, -r, to program, recover/erase and reset the device.

Regards,
Jonathan

RE: nRF52832 custom board Able to upload code but it's not run internally after power-up board.

AB-Mangukiya — Sun, 03 Oct 2021 17:59:59 GMT

Hey, Jonathan.

Thanks for your replay.

Please find below PDF of complete project Schematic as well as Zip of Gerber file for pcb board layout.

can you suggest me what is exactly issue??

That is basically issue of clock or connection or anything else because As I test I am able to flash code with Segger but code not run internally as we expect after power up board or reset board.

devzone.nordicsemi.com/.../MPU6050-with-nRF52840_5F00_Left-Hand.pdf devzone.nordicsemi.com/.../1565.Gerber.zip

Also I have Another questation about nRF52832-QFAA chip SOIC.

--> nRF52832-QFAA is preloaded UART bootloader or we need to flash bootloader using Segger or anything else platform??

RE: nRF52832 custom board Able to upload code but it's not run internally after power-up board.

JONATHAN LL — Mon, 27 Sep 2021 13:43:17 GMT

Hi,

Have you asked the Arduino forum how to add extra boards to the Arduino IDE. We do not support the Arduino IDE so cant guide you there, but if you are willing to test nRF Connect SDK or nRF5 SDK then I could help you test.

Have you followed the layout of the Feather for your design ?

[quote user=""]Use J-Link EDU segger to upload code and 3.3V/SWDIO/RESET/SWLK/GND pin used I don't use SWO and I think no use of SWO pin.[/quote]

This should be ok.

Could you share the GERBER files for you PCB layout, i can have a look and see if there is anything that is not correct.

Regards,
Jonathan