EMI modeling of a 32-bit microcontroller in Wait Mode

This paper presents a predictive model for the ElectroMagnetic Interferences (EMI) of a 32-bit microcontroller running in a WFI (Wait For Interrupt) mode. The simulated results correlate well to the TEM-Cell measurements. In the future, this model will be extended to be able to simulate the microcontroller in other modes (digital core running, Flash Memory reading or writing, etc.). The model has been simulated with the help of the ELDO simulator while the measurements have been done on a 32-bit STMicroelectronics microcontroller, so-called STXX, following the IEC 61967-2 standard. The aim of this work is to be able to predict, during the design stage, the level of electromagnetic emissions in order to establish some design or layout rules without needing to simulate the whole product.