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AN52433 - Advantages of Serial Peripheral Interface (SPI) nvSRAM over SPI EEPROM in Metering Applications | Cypress Semiconductor

AN52433 - Advantages of Serial Peripheral Interface (SPI) nvSRAM over SPI EEPROM in Metering Applications

Last Updated: 
Aug 16, 2016
Version: 
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This is an Obsolete Application Note
The document AN52433 - Advantages of Serial Peripheral Interface (SPI) nvSRAM over SPI EEPROM in Metering Applications has been marked as obsolete. The obsolete version of this application note is still available with the below description but may not be complete or valid any longer. If you have any questions or require support in regards to the below application note content, please click here and create a technical support case.

This application note describes the benefits of using SPI nvSRAM in metering applications and is aimed at designers and architects of the latest 'smart' electrical energy meters.

Introduction

Cypress's nvSRAM is a proven, established combination of fast SRAM cells and silicon-oxide-nitride-oxide-silicon (SONOS)-based nonvolatile memory cells. You can rapidly transfer the entire contents of the SRAM to nonvolatile storage automatically (AutoStore) if the power supply fails, or transfer on demand by issuing the relevant software command (Software Store). The nvSRAM requires a small (typically 47 uF) capacitor connected to its VCAP pin to complete its AutoStore operation. When the main power supply (VCC) is applied to the nvSRAM, it charges the capacitor connected to its VCAP pin. When the power supply falls below a threshold (VSWITCH), the nvSRAM automatically switches from VCC to VCAP and completes the AutoStore cycle.

 

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