This document provides advice on designing applications based on devices of the ST10F27x family, including the ST10F276, ST10F275, ST10F273, ST10F272, and ST10F271. It covers information and recommendations on using an external resonator with the on-chip oscillator, details on start-up configuration and necessary precautions, filtering, decoupling, and use of special pins, recommendations to reduce ADC conversion errors, memory interface, and interfacing with the L4969 CAN interface.