You are here

AN401 - Charging Methods for the F-RAM RTC Backup Capacitor | Cypress Semiconductor

AN401 - Charging Methods for the F-RAM RTC Backup Capacitor

Last Updated: 
Mar 02, 2021
Version: 
*C

AN401 describes the charging methods for the F-RAM RTC (FM31xxx/FM33xxx Processor Companion family) backup capacitor. A backup capacitor is used for backing up the real-time clock and event counters

Introduction

The F-RAM real-time clock (RTC), which includes the FM31xxx/FM33xxx Processor Companion family devices, provide an option to backup RTC and event counters in the absence of system power through a backup power source (VBAK). VBAK can be either a battery or a capacitor. However, often a capacitor is preferred.

Dear valued customer,

Thank you for choosing our products. They come with all the know-how and passion that our engineers have put into it. As you probably already know, Cypress is now Infineon. This is a major step for our company, but also for the good of you. 

Reliability and business continuity are of utmost importance for us. Hence, we remain fully committed to honoring existing customer and distributor relationships. This includes offering the legacy Cypress product portfolio. We thank you very much for your trusting support.

For the full version of this message, please download the PDF version.