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BQ79616-Q1: Writing to OTP memory with cells connected

Stefan
Prodigy 40 points
Part Number: BQ79616-Q1
Other Parts Discussed in Thread: BQ79616

Tool/software:

Hello,

According to the FAQ for the BQ769x2 [1] 4.10, writing to OTP memory is permitted only when the cells are disconnected.

We understand that the BQ79616 is a different device.
However, to ensure clarity, could you confirm whether this restriction applies to the BQ79616 as well?
We have tested it, and it seems to work.
If the restriction does apply, could you explain why and what potential issues might arise?

Additionally, we would like confirmation on whether writing to OTP memory is guaranteed to work with multiple devices in a daisy chain.
We have tested it and found it to work, but are there any potential issues we should be aware of?

Thank you in advance for your assistance!

Best regards,
Stefan

[1] www.ti.com/.../sluaaq5.pdf

  • +1
    TI__Expert 7000 points

    Hi Stefan,

    As LDO control and differing communication modes are not set by the customer OTP, the customer can program OTP while using batteries. Therefore, this restriction does not apply to BQ79616.

    Regards.

    David Ray

  • 0 in reply to David Ray
    Prodigy 40 points

    Hi David,

    Thank you for your quick response and clarification regarding OTP programming.

    I wanted to follow up on the second part of my question: could you confirm if writing OTP memory is guaranteed to work reliably with multiple devices in a daisy chain configuration?

    The reason I’m asking is that I’ve noticed most discussions and examples involving OTP programming appear to involve only a single device.

    Your insight would be greatly appreciated!

    Best regards,
    Stefan

  • +1 in reply to Stefan
    TI__Expert 7000 points

    Hi Stefan,

    Yes, Programming OTP would work reliably with multiple devices in a daisy chain configuration.

    Regards,

    David Ray

  • 0 in reply to David Ray
    Prodigy 40 points

    Hey David,

    Thank you again for your response!

    Best regards,
    Stefan