Clarification Required on DCC Pin Impacting UART Debugging (nRF52833-QDAA-R)

RE: Clarification Required on DCC Pin Impacting UART Debugging (nRF52833-QDAA-R)

Håkon Alseth — Fri, 09 May 2025 10:01:04 GMT

Hi,

There is no impact between UART and DCC pin.

Kind regards,

Håkon

RE: Clarification Required on DCC Pin Impacting UART Debugging (nRF52833-QDAA-R)

Jhakan — Fri, 09 May 2025 09:47:12 GMT

Hello Hakon,
Thanks for your response.

Sure we will check the firmware once, but as stated in the datasheet only the LDO is enabled as default and since we haven't changed any register setting for DC/DC we wanted to clarify.

Kindly state how there is a direct impact for UART debugging and DCC pin .

Thanks & Regards,
Jhakan.M

RE: Clarification Required on DCC Pin Impacting UART Debugging (nRF52833-QDAA-R)

Håkon Alseth — Fri, 09 May 2025 07:01:46 GMT

Hi,

It sounds like your firmware enables DCDC.

When the hardware does not have DCDC inductors in place and the firmware writes to the .DCDCEN register, the device will do a full power-on-reset.

If soldering on inductors to the DCC pin makes the chip function, it sounds like the firmware needs to be revisited.

Are you using NCS or nRF5 SDK?

For NCS, see here on how to use LDO mode for both newer and older versions: RE: helloworld and blinky don't work in RAYTEC-MDBT50Q-CX-40.

Kind regards,

Håkon