NFC low power - does not return to low power after transaction nrf54 zephyr

[narfster]

Hi,

using nrf sdk connect 3.1.1

using nRF54L15-PDK evaluation board.

Steps to reproduce issue:

1. Setup my board into low power.  my branch mark is ~2.9uA.

2. Perform NFC transaction with an NFC reader. - A read from the tag and then a write to the tag.

3. Observe power consumption remains at ~229uA after NFC transactions.

using nfc_t4t_lib.h emulation mode.

CONFIG_NFC_T4T_NRFXLIB=y
CONFIG_NFC_NDEF=y
CONFIG_NFC_NDEF_MSG=y
CONFIG_NFC_NDEF_RECORD=y
CONFIG_NFC_NDEF_LE_OOB_REC=y
CONFIG_NFC_NDEF_PARSER=y

thanks

Dan

[Simonr]

Hi Dan

This issue is a known one and has been fixed in nrfx v4.0.0 which was added to NCS v3.2.0. So you can either update to the newest SDK version or use this pull request https://github.com/nrfconnect/nrfx/pull/884 for reference to your project to get NFC to power down after use.

Best regards,

Simon

[narfster]

Simon, your provided link  https://github.com/nrfconnect/nrfx/pull/884  is broken.

[Simonr]

Hi Dan

Sorry, I realize that is a private repository. Here are the related pull requests in the nRF Connect SDK and Zephyr PR.

Best regards,

Simon

[narfster]

I can confirm, moving to v3.2.0 did the job.

I can reach low power on dev board nrf54 ~2.9uA after NFC read / write

thanks.

Dan