The power consumption of the nRF52840 during advertising

RE: The power consumption of the nRF52840 during advertising

Karthik p — Mon, 17 Jun 2024 05:29:33 GMT

Hi Priyanka,

yes you are right.

In one of my private ticket the best voltage to measure the current consumption of nrf52-DK by giving 3v0.

what is your suggestion.

BR,

Karthik

RE: The power consumption of the nRF52840 during advertising

Priyanka — Thu, 13 Jun 2024 09:35:11 GMT

Hi Karthik,

[quote user="Karthik p"] sensor getting its 1.8v from the external power supply not from the nrf-dk.[/quote]

Yes, that is the problem. The sensor cannot be powered by 1.8V externally if the nRF voltage is higher than 1.8V. So you need to have VDD voltage for both the devices at the same level.

Also, please put your nRF switch to the "nRF Only" position without which there will be a current flow from nRF VDD to the onboard debugger.

-Priyanka

RE: The power consumption of the nRF52840 during advertising

Karthik p — Tue, 11 Jun 2024 08:51:46 GMT

Hi Priyanka,

/cfs-file/__key/communityserver-discussions-components-files/4/NRF52840-BLE-Power-Profile-.docx

Please go through this Doc.

Note: sensor getting its 1.8v from the external power supply not from the nrf-dk.

BR,

Karthik

RE: The power consumption of the nRF52840 during advertising

Priyanka — Tue, 11 Jun 2024 08:41:50 GMT

Hi Karthik,

[quote user="Karthik p"]Only one sensor, which uses SPI and is supplied by an external 1.8V source, is connected to the DK.[/quote]

This could be a reason perhaps. Your sensor must have the same voltage level as the nRF device and hence when you increase your supply voltage from 1.8V to around 3V, you begin to back power the external sensor through the GPIOs.

It would be good to get a detailed description of how you have connected your DK for the current measurements and also the external sensor too.

-Priyanka

RE: The power consumption of the nRF52840 during advertising

Karthik p — Thu, 06 Jun 2024 04:36:11 GMT

Hi Priyanka,

No changes were made to the code before or after changing the voltage. Only one sensor, which uses SPI and is supplied by an external 1.8V source, is connected to the DK.

BR,

Karthik

RE: The power consumption of the nRF52840 during advertising

Priyanka — Wed, 05 Jun 2024 11:39:52 GMT

Hi Karthik,

Do you have any peripherals or extra connections on the DK? Any hardware changes that you have made?

Which sample are you running?

-Priyanka

RE: The power consumption of the nRF52840 during advertising

Karthik p — Fri, 31 May 2024 05:40:25 GMT

Hi Priyanka,

Disabled all UART's ✔

Disabled the debug and logs ✔

1. The first picture shows the power profile of 1.8V in advertising mode.
2. The second picture shows the power profile of 2.6V in advertising mode.

My questions are:
1. Why is the current consumption so low for 1.8V?
2. Why does the baseline shift when changing the voltage from 1.8V to 2.6V?

BR,

Karthik

RE: The power consumption of the nRF52840 during advertising

Priyanka — Thu, 30 May 2024 13:17:02 GMT

Hi Karthik,

You can have higher power consumption than the online simulator for various reasons:

1. Optimize the data transfer - You can try to adjust your data size and also the data transfer interval to reduce your average current.

2. Disable unused UARTs.

3. Optimize the network configurations.

4. Disable the debugging and logging.

Regards,

Priyanka