The TEF668X series, also known as 'Lithio', offers high-performance and advanced features for car radio devices in the mainstream to high-end market segments. This user manual provides a comprehensive description of the TEF668X control interface and API (Application Programming Interface), including detailed write and read commands, data and parameter definitions, and background information on its functionality. No matter whether you are a developer, engineer or product manager, you will find the information in this document helpful. Explore and unleash the power of TEF668X now with this manual!