[116] NFCT: HFCLK not stopped when entering into SENSE_FIELD state

This anomaly applies to IC Rev. Engineering A, build codes QIAA-AA0.

Symptoms

Higher current consumption than specified in SENSE_FIELD state.

Conditions

The NFCT is going from ACTIVATED state to SENSE_FIELD state.

Consequences

Higher current consumption in SENSE_FIELD state.

Workaround

  • Do not use the FIELDLOST_SENSE shortcut in NFCT.
  • Do not use a PPI channel to short FIELDLOST event and SENSE task in NFCT.
  • When the FIELDLOST event is triggered in NFCT, write 0x01 to address 0x40005010. Then trigger the SENSE task in NFCT to go into SENSE_FIELD state.

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