A modern microntroller or system-on-chip is much more than simply a processor and some digital peripherals, typically integrating a selection of analogue IP also. In this latest episode of Open Source Digital Design Insights we speak with Professor Elkim Roa, Head of the OnChip Group at UIS Colombia, who are building on the RISC-V architecture and working to address the lack of free and open source silicon (FOSSi) analogue IP, such as LDO, power on reset, ADC and DAC etc.