nRF52833 Power Configurations

[Muhammet YILDIZ]

Hello everyone,

I am starting a new project with nRF52833.

I would like to learn more about minimum connections and power configurations on this chip.

Let's say I don't have anything else than the MCU. What default connections should I have? What is the power configuration should look like?

In this link, there are more than one options and it is confusing.

My device will have a coin-size battery (or two), e-paper display, button, RGB LED and a chip antenna. I don't need too many pins. I believe 40 pins package should be good enough for me.

The power consumption must be the lowest.

Should I enable the DC/DC on the MCU?

Which design should I choose in that link and is there any other suggestions or anything else to consider?

Thank you.

[Einar Thorsrud]

Hi,

In this link, there are more than one options and it is confusing.

There are several referance designs in order to cover different package variatns and different configuration of optional components. If you look at the tables for each variatn you can see the differences and pick the one relevant for you.

In order to pick which reference design you should follow, there are a few critical things:

1. If you have power consumption requierments you should include the optional components for the DC/DC converter. This will significantly improve energy efficiently.
2. You should also consider adding the optional 32.768 kHz crystal. This will improve energy efficiency particularily when using wireless protocols like Bluetooth.

Moreover, as you are pwoering from a coin-cell the voltage is about 3V, and you will not use the VDDH regularor, so the reference scematics conserning that is not relevant.

There are also some firmware considerations for low power optimization, that you should keep in mind.