[77] CLOCK: RC oscillator is not calibrated when first started

nRF52805 Revision 2 Errata

This anomaly applies to Revision 2, build code CAAA-Bxx.

It was inherited from the previous SoC revision Revision 1.

Symptoms

The LFCLK RC oscillator frequency can have a frequency error of up to 25 to +40% after reset. A +/ 2% error is stated in the Product Specification.

Conditions

Always.

Consequences

The LFCLK RC oscillator frequency is inaccurate.

Workaround

Calibrate the LFCLK RC oscillator before its first use after a reset.