LPC812 - flash corrupted

[vojtechhavlicek]

Hi,

I have question about possibility of Flash data corrupting. I have system with persistent data saved into the flash - IAP. This data are saved in the end of manufacturing process (Serial number, setting etc). Sometimes happens (rarely - 1x/month/2000 devices) that these data are completely erased to 0xff (I´ve tried to connect to running target and there were no fragments wit old saved data) so I have to start initialization process for setting these values. Do you have any idea what could be the reason? These data were not corrupted in write process because write process is proceeded only in the end of manufacturing. (Devices with LPC812 runs in EMC harsh environment - photovoltaic powerplants etc).

[jeremyzhou]

Hi vojtech havlicek,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
Firstly, I'd like to suggest you do the radiated emission measurements to validate whether it exceeds the EMC compatibility of the LPC812.
Secondly, I think you need to do contrast testing to confirm the issue is related to the EMC harsh environment or not.

Have a great day,
TIC

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