BQ20Z95: Dataflash lifetime ?

Mathieu Froger

Part Number: BQ20Z95

Dear support,

The dataflash lifetime of the BQ20z95 is given for 10 years in the datasheet.
What is the behaviour of the memory after 10 years ? Are the dataflash and the protection thresholds completely erased ?

Is it possible to write again the dataflash after 10 years to extend the lifetime of the BQ20z95 10 years more ?

Thank you

Regards,

over 4 years ago

0 Abraham Rashid over 4 years ago

TI__Expert 3030 points

Hi Mathieu,

10 years is data retention time, that is data can be stored for 10 years at least if device is not powered, data in the Flesh won't be reliable after 10 years. Data will be complete if device is powered up during this 10 years time. If device is powered and used, lifetime is determined by Flash programming write-cycles, which is 20K for this device. So after 20K cycles of writing, device cannot store new data anymore.

0 Mathieu Froger over 4 years ago in reply to Abraham Rashid

Prodigy 40 points

Hi Abraham,

Thanks for your detail response !

Does some write-cycles are done during the usage of the BQ20z95. To my understanding, some write-cycles are performed during the configuration of the BQ20z95 (write dfi file) but I don't know if the BQ20z95 write in the flash during this usage.

Thank you.

0 Abraham Rashid over 4 years ago in reply to Mathieu Froger

TI__Expert 3030 points

Hi Mathieu,

Yes, BQ20z95 writes in the flash during this usage. Some parameters are changed real time by the firmware and stored in data flash, those changes require write operation.

Best Regards,
Abraham

0 Mathieu Froger over 4 years ago in reply to Abraham Rashid

Prodigy 40 points

Hi Abraham,

Thank you for your answer.
Do you know the frequency that the BQ20z95 writes in the Flash.

Regards,

Mathieu

+1 Abraham Rashid over 4 years ago in reply to Mathieu Froger

TI__Expert 3030 points

Hi Mathieu,

It's application relevant but some contents will be updated every 1s, some at a reset, etc..

Best Regards,
Abraham

0 Mathieu Froger over 4 years ago in reply to Abraham Rashid

Prodigy 40 points

Hi Abraham,

Thanks for your response.

I have all information I need.

Thank you.

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BQ20Z95: Dataflash lifetime ?