Errata nRF9160 - LFXO: LFXO startup fails

This anomaly applies to IC Rev. Revision 1, build codes SICA-B0A.

It was inherited from the previous IC revision Engineering A.

Symptoms

LFXO does not start up.

LFXO is set up in a wrong mode and unable to start up in all conditions.

LTE modem does not work.

Apply the following code after any reset:


*((volatile uint32_t *)0x5000470Cul) = 0x0;
*((volatile uint32_t *)0x50004710ul) = 0x1;

This workaround is implemented in MDK version 8.29.0.