Hello.
I am using the nRF5340 DK.
According to the circuit diagram, it seems that when I apply power to VBUS_nRF, there should be no power on VDD_nRF of the MCU.
(Power only to VBUS_nRF, Switch9 is located on VSRC_NRF)
And it looks like the nRF5340 only powers up the VBUS and nothing else but the application core.
I think it doesn't work when I apply power to VBUS only, but it needs to apply power to VDD too.
However, I checked 3V voltage on the VDD pin on the DK board.
Am I missing something?
In the circuit above, we see that the VDD pin(pin number 1 of P1) of the DK board is connected to VIO.
However, as shown in the circuit above, VIO is fed through VDD and VDD is fed through VSRC_NRF only when SW10 is turned ON.
When power is applied to VBUS_nRF only,
@ SW10 == OFF) VDD pin = 3V
@ SW10 == ON) VDD pin = 2V
is measured.
When SW10 == OFF, shouldn't 0V be measured on VDD pin?
In the circuit above, we see that the VDD pin(pin number 1 of P1) of the DK board is connected to VIO.
However, as shown in the circuit above, VIO is fed through VDD and VDD is fed through VSRC_NRF only when SW10 is turned ON.
When power is applied to VBUS_nRF only,
@ SW10 == OFF) VDD pin = 3V
@ SW10 == ON) VDD pin = 2V
is measured.
When SW10 == OFF, shouldn't 0V be measured on VDD pin?
