Pre-certified Class B self-test library for EFM32 Cortex-M3-controlled white goods ensures safe and reliable operation Energy Micro offers of a self-test library for the ARM Cortex-M3 based EFM32 Gecko microcontroller family. The free of charge library was developed, tested and pre-certified according to the IEC 60335 and IEC 60730 standards. Intended to prevent unsafe operation of the controlled application, the Class B self-test library supports household appliances that require certification according to the latest IEC 60335 or IEC 60730 standards and their respective EN alternatives. The library contains detailed tests and diagnostic methods and ensures safe operation of the microcontroller. The free availability of the library dramatically simplifies the effort to obtain Class B certification.