Errata nRF52840 - NFCT: Event FIELDDETECTED may be generated too early

This anomaly applies to Revision 2, build codes CKAA-Dx0, QIAA-Dx0.

It was inherited from the previous IC revision Engineering D.

Symptoms

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

Always. Especially with stronger field strengths.

Restart of transfer required.

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.