nRF52840 VDD voltage ripple

RE: nRF52840 VDD voltage ripple

Kenneth — Tue, 05 May 2020 07:55:49 GMT

Try to add decoupling so that VDD does not fall with more than 100mV during for instance BLE or GPIO activity, though maximum it should not fall more than 300mV.

So ideally less than +-50mV, and always less than +-150mV.

Best regards,
Kenneth

RE: nRF52840 VDD voltage ripple

Poki Huang — Tue, 05 May 2020 03:28:20 GMT

Hi Kenneth:

As a rule of thumb you should try to have sufficient decoupling to try to reduce ripple to less than "100mV"

So the 100mV means +-50mV or +-100mv?

Thank you~~

RE: nRF52840 VDD voltage ripple

Kenneth — Thu, 30 Apr 2020 11:45:07 GMT

Large ripple on VDD may impact analog performance (e.g. it can affect radio performance, adc, and clocks), but the chip will be functional within the entire operating conditions of 1.7-3.6V.

As a rule of thumb you should try to have sufficient decoupling to try to reduce ripple to less than 100mV.

Best regards,
Kenneth