[178] SAADC: END event firing too early

This anomaly applies to IC Rev. Rev 2, build codes QFAA-E00, CIAA-E00, QFAB-E00.

It was inherited from the previous IC revision Rev 1.

Symptoms

False END events.

Conditions

Offset calibration is run with TACQ < 10 µs before sampling is started.

Consequences

The END event can occur earlier than expected. Data is not ready.

Workaround

Apply one of the following workarounds:
  • Run offset calibration with TACQ >=10 µs.
  • Apply STOP task after calibration, before sampling. CALIBRATEOFFSET -> CALIBRATEDONE -> STOP -> STOPPED -> START.