Shall I leave the LC filter attached to DCCH pin alone?

RE: Shall I leave the LC filter attached to DCCH pin alone?

Mitch996 — Fri, 10 Feb 2017 03:00:47 GMT

Much obliged Ole! You have eliminated my confusion completely!

RE: Shall I leave the LC filter attached to DCCH pin alone?

Ole Bauck — Wed, 08 Feb 2017 10:39:30 GMT

Hi,

I suggest you read this chapter in the nRF52840 Product Specification.

The nRF52840 has two voltage regulators, one for high voltage (2.5-5.5V) and one for low voltage (1.7-3.6V). These two regulators have to operation modes: LDO or DCDC. With the DCDC mode you need to add an external inductor. If your input voltage is lower than 3.6V you can skip regulator 0 and connect VDDH and VDD together (see figure 2).

The reference layouts will also show you the different configurations. We strongly recommend that you follow the reference layout as much as possible.

Ole

RE: Shall I leave the LC filter attached to DCCH pin alone?

Mitch996 — Wed, 08 Feb 2017 01:15:51 GMT

Hello, I'm not sure that I understand you, by "Is it related to the DCDC power supply? " do you mean it supplies power to others? Which is kinda odd? No it does not in my project, but, I feel stupid for saying this, I do draw power from other places, AMS1117 for example, so yea, I want a power supply as stable as possible.

RE: Shall I leave the LC filter attached to DCCH pin alone?

butch — Tue, 07 Feb 2017 12:24:56 GMT

Is it related to the DCDC power supply? A boost converter? At least on the 52832, you have a choice of power supplies (see the several schematics under that topic.)