NFC current consumption - nRF52832

[kizhimon]

Dear All,

I am trying to figure out the maximum current consumed during the NFC operation.

I am using nRF52832 and writable_ndef_msg example from the SDK (LED, flash write disabled)

I measured the current when I write 50 bytes from my mobile using TagWriter app by NXP. It is given below:

The datasheet says an NFC active current (Iactivated) of 480 uA. But I observe a peak current of 18 mA. Why is this so ?

[Priyanka]

Hi,

Are you using the nRF52DK or a custom board?

Regards,

Priyanka

[kizhimon]

It is nRF52DK board. 

[Priyanka]

Hi,

Sorry for the delay in response. It should be noted that the NFC uses EasyDMA so your current consumption will be a bit higher than the 480uA. Do you have any peripherals etc connected to the board?

-Priyanka

[kizhimon]

But 18 mA is a  bit higher for EasyDMA. I understand that HFCLK will be turned on during NFC operation and I expect a higher current than 480 uA, but not 18 mA. 

Priyanka said:

Do you have any peripherals etc connected to the board?

No

Could you please check the current consumption at your side ?

[Priyanka]

Hi,

Have you tried measuring the System OFF current so that you get an idea of the idle current? Could you also take a look at this ticket for instance?

-Priyanka