nRF52-DK : capacitors C52 and C53?

[vadim.barshaw]

Hello,

nRF52-DK (PCA10040) has two mysterious 12 pF capacitors C52 and C53 connected to P0.25 and P0.26 respectively (see attached picture).

Is there any special purpose for them being there?  Can they be omitted?

Kind regards,

    Vadim

[Andreas]

Hi,

 

This is a fix for errata 138: https://infocenter.nordicsemi.com/topic/errata_nRF52832_Rev2/ERR/nRF52832/Rev2/latest/anomaly_832_138.html?cp=4_2_1_0_1_35

They might not be needed, but as you do not know until you test your boards it is recommended to leave them in, or to ground the pins into the center pad (if not used).

 

Best regards,

Andreas

[vadim.barshaw]

Hi Andreas,

Many thanks for your prompt response. We will leave the capacitors in.

Kind regards,

    Vadim

[Andreas]

Hi,

 

I would recommend so. If you want to know whether you can shave them off your BOM you can just de-mount them and test radiated unwanted emissions in RX.

 

Best regards,

Andreas