Regarding nrf52840

RE: Regarding nrf52840

Andreas — Fri, 29 Mar 2019 11:57:21 GMT

Hi,

If VDDH and VDD are not connected together externally, the device will be in high voltage mode. We have little specifications on power consumption differences other than what is in the PS, but at 3.7V you will exceed the supported supply range for normal mode.

Best regards,

Andreas

RE: Regarding nrf52840

Alan Ajit — Fri, 29 Mar 2019 10:48:16 GMT

Thanks for your replay. my doubt is not cleared. in my circuit VDDH is 3.7v and VDD is connected to VDD_nrf. I think its in high voltage mode is it right?

1. its not clear what is the difference between this modes. for better power consumption which mode is better?

RE: Regarding nrf52840

Andreas — Thu, 28 Mar 2019 12:51:54 GMT

Hi,

See the POWER - Main supply section of the PS. When feeding the SoC through VDDH, there is a 'high votlage' regulator stage that steps down the voltage on the 'VDD' rail, the voltage of which you specify in UICR.REGOUT0. If you do not specify anything here, VDD will be 1.8V by default.

Best regards,

Andreas