Q:

The LFXO is not starting. What is wrong?

A:

Designs with the Low Frequency Crystal Oscillator (LFXO) using external resonators require a few parameters to be set correctly for the oscillator to function properly. Please follow the guidelines in the application note "AN0016 Oscillator Design Considerations" for more information on this topic. This application note includes both a PDF document with theory on the topic as well as an excel spreadsheet to calculate the paramteres. The application note can either be found in Simplicity Studio or here.