S32K144 FlexRAM as Emulated EEPROM lifetime issue

[建宽高]

HI ,i have a question abut S32K144  FlexRAM as Emulated EEPROM lifetime 

- firsrt, i read S31Kxx Data Sheet(REV 7)

on page 37

it says  FlexRAM as Emulated EEPROM max lifetime is 5 year,so If I write data in eeprom and been on for more than five years open, what happends? Data will be lost? and what can i extend lifetime?

[jiri_kral]

Hi, 

actually - the datasheet says that the minimal data retention is 5 years, not maximal. Also this time period is for untouched memory. If you update EEEPROM value - the time is restarted. 

So - if you are planning 5+ years long time usage NVM without any update in EEEPROM area (actually - can't imagine any real use case) - you can just read data from EEEPROM, clear all values and write them again in some maintenance mode. 

Jiri

[建宽高]

For example, the product may go from burning to actual sales, which may be more than 5 years, such as inventory vehicles.

In this case, I can judge the reading by reading the flash custom flag after writing the epprom. Do I have to rewrite the original eeprom parameters?

Can I do this?

[jiri_kral]

Well, the datasheet says - minimal data retention in EEEPROM backup flash is 5 years. If you need to store your device with already stored data in EEEPROM  for 5+ years, you can store backup of EEEPROM data in normal flash area (the data retention for Flash is 20+ years) and rewrite the EEEPROM area if the data differs.     

Jiri

[建宽高]

hi, @Jiri Kral

As long as one is updated, is the other life span updated with the updated life span?

[建宽高]

3Q very much !!!!!!!!!!!!!!!!!!!!!!!!!