[190] NFCT: Event FIELDDETECTED may be generated too early

This anomaly applies to IC Rev. Engineering C, build codes QIAA-CA0, CKAA-CA0.

It was inherited from the previous IC revision Engineering B nRF52840.

Symptoms

Reset of the operating state after FIELDLOST event. In some cases, communication with the peer device is not possible.

Conditions

Always. Especially with stronger field strengths.

Consequences

Restart of transfer required.

Workaround

On FIELDDETECTED event, wait 1 ms (using timer) before starting NFC communication with NRF_NFCT->TASKS_ACTIVATE.

This workaround is included in SDK v15.0.0.