Design and implementation of supercapacitor based RTC module

Abstract

This paper presents the design and implementation of a supercapacitor-based real-time clock (RTC) module for memory backup systems. The study explores the advantages of utilizing supercapacitors over traditional lithium-ion batteries, including infinite cycle life, rapid charging, and environmental safety. The design process involves selecting suitable supercapacitors based on factors such as leakage currents and time retention formulas. Practical steps for integrating supercapacitors into RTC and memory backup circuits are provided, with a focus on efficiency and longevity. A case study examines the charging time of a specific supercapacitor model, considering resistor and equivalent series resistance (ESR) effects. Additionally, the paper addresses the operational duration of RTC modules solely powered by supercapacitors after the main power supply is disconnected, providing insights into capacitor discharge characteristics. The implementation phase emphasizes the importance of component selection and circuit optimization for maximizing performance. The study showcases the practical application of supercapacitors in memory backup systems and highlights their potential for enhancing reliability and sustainability in various electronic devices.