Custom Board Programming

[Alan Ajit]

Dear Nordic

I have custom board(nRF52840) its not detecting through Jlink (from nRF52 DK). 

I tried to connect nRF52840 dongle(using J2 in dongle) with same setup its detected and i can flash program to it

when i tried to connect to my board its shows cannot connect to target. I need some help to detect my board

Supply voltage of my custom board

VDDH--->3.7 v

I get VDD_nRF -->3.1V

VDD-->3.1V

Is it any other voltage source need to be check for proper working of chip(nRF52840)?

Can you help me to solve this issue?

Program Interface voltage:-3.3v

I need some support to detect My custom board using Jlink 

[Edvin]

Hello,

When you connect the dongle, do you use the 10-pin connector that you have soldered on (onto P1), or do you use the SWDIO and SWDCLK? (what do you mean with J2?)

Do you have an external programmer, or do you use a DK to program the devices?

Can you please describe your connection setup with the working dongle, and the not-working custom board?

Especially if you don't use a 10-pin contact, what other pins do you connect in both cases?

Best regards,

Edvin

[Alan Ajit]

sorry for late reply i used a tag connector for connection  in connector near to neck of dongle(hope that connector name J2 not p1)

same setup i used for custom board(my board provide 3.3 v) dongle works fine but custom board do not connect

 using DK board and 10 pin tag connector

[Edvin]

Ok. I see. So you use the 10-pin needle adapter/tag connector to program your custom board as well? Or do you use something else? Have you checked that you have routed the pads for the 10pin connector on the custom board correctly?

You have to make sure that the two boards (DK and custom board) as common ground. Just short the GND from one of them to GND on the other.

See if that helps. If not, I think we need to look at the power supply. I can't find it specified anywhere what voltage the Segger programmer on the nRF52DK requires on the target chip. Does it help if you also short VDD on the DK to the custom board?

Best regards,

Edvin

[Alan Ajit]

I shorted GND of both DK and custom board till board not connected and both connector pins are same

my connections

SWDIO----->SWDIO(4th pin)

SWDCLK------>SWDCLK(5 th pin)

VDD------->VDD(2nd pin) and VTG(3rd pin)

Reset ---->Reset(7 th pin)

GND  ----->GND detect(8 th pin)

DK and Custom board ground also shorted

nrf 52 dk are used

but board still not working

[Alan Ajit]

we are using high voltage design

one more thing i noticed that VDD_nrf voltage in custom board is 3.1 voltage but in dongle its 1.8 voltage and our custom board DEC5 has no voltage

is it any problem?