Source code for NFC current consumption

[Sridhar Jonnavittula]

Hi team,

We have our custom board based on nRF52840 SoC.

I was trying NFC text record example provided in SDK 15.3.0 by commenting out log, LEDs. I was not able to observe numbers similar to below picture.

So can you please provide related source so that I can verify our board?

Thanks

Sridhar

[Jørgen Holmefjord]

Hi,

What current do you measure on your board?

The currents in the table you posted are the run current for the NFCT peripheral itself, it is not the run current of the entire chip. In sleep mode, you will have to add the current for System ON/OFF mode to the NFCT run current to get an accurate number.

Best regards,
Jørgen

[Sridhar Jonnavittula]

Current I observe in NFCT active mode is 1.63mA which is for entire chip.

Even I separate System ON current 2.35uA, I still not able to reach 400uA.

Can you please suggest any example/ method to quickly verify?

Thanks

[Jørgen Holmefjord]

The additional current you are seeing when the NFCT is active is most likely the EasyDMA current (~1.2 mA). This is due to the tag data being transferred directly from RAM.