This application note presents numerous methods to effectively reduce noise problems in microcontroller designs
This document presents numerous methods to effectively reduce noise problems in microcontroller designs. The first part covers hardware solutions, focusing on optimized PCB layout and power supply filtering to increase equipment immunity to noise. It discusses minimizing loop areas, reducing inductance, and using appropriate decoupling capacitors.
The second part concerns writing software that is more immune to disturbances caused by noise or power glitches. It outlines basic precepts for safe software development, such as testing clearly defined configurations, regularly checking vital data, controlling program flow, and filling unused memory, with specific examples written for the ST62 MCU family.
The document presents the ST6210 as the microcontroller designed for noisy environments.
A ceramic capacitance of 0.1mF to 1mF should be used for critical chips operating at high frequency.
Unused V/O pins should be connected via a large impedance, specifically 100kW, to a fixed potential.