Need external power supply for custom board.

[Aman711]

Hi Team,

I am using nRF52840_DK to program my custom board but I am facing some voltage related issue from VDD pin.

Measuring on board it's giving 3.0V for VDD & GND but on my custom board it's reduced to 2.5 V and because of that I can not program the device.

On custom board I have npm1100 + nRF52840 combination.

Regards,

Aman

[Hung Bui]

Hi Aman, 
The voltage at 2.5V , is intended or it supposed to be 3.0 V ? 
Which voltage did you configure the nPM1100 to output ? 
You may want to isolate the chip and try to supply it with 3.3V as it's the voltage the DK programmer can do programming. 
Or you may want to get hold of a Jlink Programmer that can support voltage lower than 3.3V. 

[Aman711]

Thank you for your response.

The voltage at 2.5V , is intended or it supposed to be 3.0 V ?  - It's supports 3.0V

Which voltage did you configure the nPM1100 to output ? 

- I am new to npm1100 and I do have P 1.10 Pin connected to npm1100_mode pin inside my custom board. I will share schematic below as I have not code anything specific to npm1100 inside main.c file.

- How to supply external power supply during fleshing the board?

- please share referance link for Jlink hardware if any.

Thank you for your time.

regards,

aman

[Hung Bui]

Hi Aman, 

From what I can see your configuration is to have output VOUTB voltage at 3V: 

Please check if both the VOUTBSET0 and VOUTBSET1 has high voltage. Which input voltage you are supply to the board ? 

You can try disconnecting the nRF52 from the NPM if possible to see if the output of the nPM is correct. 

Aman711 said:

- How to supply external power supply during fleshing the board?

Just connect VDD of the nRF52 to 3.3V

Aman711 said:

- please share referance link for Jlink hardware if any.

Just search for Jlink Debuger or Jlink Programmer, you can find them. For example: https://www.segger.com/products/debug-probes/j-link/ 
The OB and EDU doesn't support other voltage than 3.3V. 

[Aman711]

Please check if both the VOUTBSET0 and VOUTBSET1 has high voltage. Which input voltage you are supply to the board ? - 3.0V from nRF52840_DK VDD Pin

You can try disconnecting the nRF52 from the NPM if possible to see if the output of the nPM is correct. - I can not as those are soldered on pcb.

I think I am using lover input voltage but let me know your thoughts.

regards,

Aman

[Hung Bui]

Hi, 

Aman711 said:

I think I am using lover input voltage

What you meant by lover ? did you mean lower ? If you have extra PCB board that has not been populated with components you can try to test. You can also supply 3V directly to the VDD pin of the nRF52 (don't power the npm) to see what you have.