[147] CLOCK: LFRC ULP mode not calibrated in production

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

Symptoms

The LFRC oscillator non-calibrated frequency tolerance (ftol_uncal_lfulp) in ULP mode is not according to specification.

Conditions

LFRC in ULP mode.

Consequences

The LFRC ULP oscillator non-calibrated frequency is unreliable.

Workaround

Do calibration after each power-up, after changing mode between normal mode and ULP mode, and if the temperature changes more than 40°C.


Documentation feedback | Developer Zone | Subscribe | Updated 2017-04-21