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LP8860-Q1: About rewriting of EEPROM

Kaji@PAN
Mastermind 7815 points
Part Number: LP8860-Q1

Hello,

I would like to ask you a question about the LP8860-Q1.
(Question 1)
According to the data sheet below, the EEPROM can be rewritten up to 1,000 times.
Is this number of times actually rewritten and confirmed?
Or is it the guaranteed design value?
Please let me know if you have any information on the failure rate.
(Question 2)
What kind of problems will occur if the number of rewrites is exceeded?
For example:
When reprogramming, the value is not updated and the previous value is retained.
Rewritten to an indefinite value or all0,
An abnormal value is read when reading a value, etc.
(Question 3)
Please tell me the definition of 1 cycle.
Will it be 1000 cycles even if only a specific register is rewritten 1000 times?
In that case, will registers that have not been rewritten even once become unguaranteed?

Best regards,

  • 0
    TI__Mastermind 31695 points

    Hi, Kaji

    Could you pls kindly let me know, why you need this information?

    Normally, EEP will only changed in the factory. What is the concern from your side？

  • 0 in reply to Zhiqian Wu
    Mastermind 7815 points

    Thank you for your reply.
    It was designed with the assumption that it would be rewritten only during the initial inspection at the factory.
    However, it was found that under specific conditions, the same value as the set value is written in the entire area every time the power is turned on.
    Therefore, I would like to know whether it is counted as 1 cycle when overwriting the same value as the current setting value.
    Also, I would like to know what kind of problems can occur when the upper limit of rewriting is exceeded.
    Best regards,

  • 0 in reply to Kaji@PAN
    TI__Mastermind 31695 points

    Hi, Kaji

    Once you write the EE_PROG, you can see it as 1 cycle. Pls check with your code.

    If EEP meets the upper limit of rewriting, It is hard to say, which value will be in the EEP after the program.

  • 0 in reply to Zhiqian Wu
    Mastermind 7815 points

    Thank you for your reply.
    I'm an FAE for a TI distributor and this question is for my customer.
    As for the first question, am I correct in understanding that even if I rewrite the same value that has already been set, it will take one cycle?
    It is unknown what will happen if you write more than 1000 times, but please give me a little more information.
    I can't reply to the customer.
    How was the number 1000 determined in the first place?
    Actual value? Or is it a design prediction?
    Best regards,

  • 0 in reply to Kaji@PAN
    Mastermind 7815 points

    Additional question.
    Regarding the definition of the number of rewrites.
    I understand that 1000 times is not the upper limit of the number of rewrites for a specific address, but the number of rewrites performed.
    Is it correct?
    Best regards,

  • +1 in reply to Kaji@PAN
    TI__Mastermind 31695 points

    Hi, Kaji

    The maximum of rewrite time is higher than 1000 times. We have a margin here.

    Pls suggestion customer don't rewrite so many times. We will not confirm the performance if rewrite time is higher than 1000.

    Yes, even if you change the each value of the EEP register, and write EE_PROG once, it will see as 1 cycle.