decoupling capacitor on VDD pin(W1 pin) of nRF52833

RE: decoupling capacitor on VDD pin(W1 pin) of nRF52833

Andreas — Wed, 23 Sep 2020 07:06:24 GMT

Hi,

See the effective decoupling capacitance spec. Also make sure you account for derating.

Best regards,

Andreas

RE: decoupling capacitor on VDD pin(W1 pin) of nRF52833

Jingar — Tue, 22 Sep 2020 14:28:47 GMT

Thanks Andras for your prompt response.

In my application, VDD & VDDH pins are directly connected to coin cell battery. There is no another capacitance .May I know minimum capacitance value required for these pins ?

RE: decoupling capacitor on VDD pin(W1 pin) of nRF52833

Andreas — Tue, 22 Sep 2020 14:00:28 GMT

Hi,

This is used to keep the supply voltage stable during spikes of current consumption. If you have sufficient capaticance close enough to the nRF52840 to supply enough current quickly enough, then you do not necessarily need it. Especially coin-cell based applications tend to need this though as there is little else on the board and the coin-cell is not able to provide enough current.

Best regards,

Andreas