nRF5340-DK power supply circuit

[Sangho Kim]

Hi Nordic

Please explain the use of signals VDD_nRF_SENSE and VSENSE_SW_OUT in the circuit.

The board version I bought is PCA10095/0.11.0/2020.50.

Thank you.

[Bendik Heiskel]

Hi,

The VDD_nRF_SENSE and VSENSE_SW_OUT signals are used to automatically select the power source. For example when the external power connector P21 is used the the coin cell and the  onboard 3V regulator is disconnected.

 

Best regards,

Bendik

[Sangho Kim]

Hi Bendik

Thank you for your reply.

Could I ask a little more detail?

Then, when external power is applied to P21, are VSENSE_SW_OUT and VDD_nRF_SENSE high or low?

Thank you.

[Sangho Kim]

Also, I would like to know more about the operation of the schematic part of "VDD_nRF sense buffer and switch".

.

Thank you.