Set nRF52840-DK in High voltage mode and measure current consumption of nRF52840 SoC

[bojan]

Hello, guys.

We would like to evaluate the current consumption of nRF52840 SoC set in High Voltage mode using nRF52840-DK.

In this thread, you have explained how to measure the current consumption of nRF52840 SoC using nRF52840-DK. However, in this thread, VDD input is used to give power supply to nRF52840 SoC which sets it in Normal voltage mode.

If we want to evaluate the current consumption of nRF52840 SoC in High Voltage mode, would it be enough to configure the nRF52840-DK the following way?

Thanks in advance for your efforts.

Sincerely,
Bojan.

[Kazi Afroza Sultana]

Hello,

The system enters High Voltage mode when the supply voltage is only connected to the VDDH pin and the VDD pin is not connected to any voltage supply.

Also, it depends on which package you are using. VDD and VDDH are short-circuited inside the QFN48 package. Therefore, the QFN48 device is only usable in Normal Voltage supply mode, and not High Voltage supply mode.

This thread can help (+) NRF52840 DK in high voltage mode - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

Thanks.

BR
Kazi

[bojan]

Kazi Afroza Sultana said:

The system enters High Voltage mode when the supply voltage is only connected to the VDDH pin and the VDD pin is not connected to any voltage supply.

In our setup that I shared with you, we are supplying nRF52840-DK through the VDDH pin only. VDD pin is the output of the REG0 stage. I am measuring 1.8V on this pin which is the expected value.

Kazi Afroza Sultana said:

Also, it depends on which package you are using. VDD and VDDH are short-circuited inside the QFN48 package. Therefore, the QFN48 device is only usable in Normal Voltage supply mode, and not High Voltage supply mode.

We want to put nRF52840-DK in High Voltage mode. nRF52840-DK is using the AQFN-73 package so we are good.

The thread you are pointing out (link) does not give any answer to my question. 

The setup we have is clearly explained in the picture, the question is also clear - is it enough to set the nRF52840-DK in High Voltage mode?

Regards,
Bojan.

[Kazi Afroza Sultana]

Hello Bojan,

bojan said:

the question is also clear - is it enough to set the nRF52840-DK in High Voltage mode?

Yes. As you are supplying DK through the VDDH pin, it should work in high voltage mode. You are measuring 1.8V on the VDD_nrf pin, so it means high voltage regulator is working as expected.