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AN400 - GENERATING A POWER-FAIL INTERRUPT USING THE F-RAM PROCESSOR COMPANION | Cypress Semiconductor

AN400 - GENERATING A POWER-FAIL INTERRUPT USING THE F-RAM PROCESSOR COMPANION

Last Updated: 
Aug 18, 2017
Version: 
*C

AN400 describes the implementation of an early power-fail warning using the general-purpose comparator on the F-RAM Integrated Processor Companion. This warning signal can be used to drive a microcontroller interrupt input.

Overview

The F-RAM integrated Processor Companion features a general-purpose comparator that can be used to generate an early power-fail interrupt (PFI). This warning signal can drive a microcontroller interrupt input and must occur before VDD drops too low to save all critical data to the nonvolatile RAM. The Processor Companion’s early power-fail interrupt can also be used as a warning to the system to stop conducting critical activity during a brownout condition.