Errata nRF52811 - RAM: RAM calibration values are not correctly loaded from FICR at reset

This anomaly applies to Revision 1, build codes QFAA-Ax0, QCAA-Ax0, CAAA-Ax0.

It was inherited from the previous IC revision Engineering A.

Symptoms

RAM calibration value is initialized to the wrong value.

Always.

Statistical margin to data retention failure when retaining RAM in System OFF is lower than intended for high temperature operating conditions.

Note: This failure has not been reported or reproduced under test at the time of publication.

Apply the following code after any reset:


*(volatile uint32_t *)0x40000EE4ul |= 0x0000000Ful;

This workaround is implemented in nRF MDK v8.25.0 and later.