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BQ40Z80: BQ40Z80 SHA-1 Compatibility and Application Questions

Tom Tsao
Expert 1850 points
Part Number: BQ40Z80
Other Parts Discussed in Thread: SHA-256

Tool/software:

Hello TI Support Team,

We are currently evaluating the BQ40Z80 and noticed that it supports SHA-1 authentication. Previously, we used the MAX17205, which utilizes SHA-256. We would like to ask:

  1. Is the SHA-1 authentication in BQ40Z80 compatible with SHA-256 authentication in MAX17205? If not, what modifications would be needed for a system transitioning from MAX17205 to BQ40Z80?

  2. What are the typical use cases for SHA-1 authentication in BQ40Z80?

  3. Are there any specific considerations or best practices when implementing SHA-1 authentication in BQ40Z80?

Any insights or documentation on this topic would be greatly appreciated.

Best regards,

  • 0
    TI__Mastermind 26135 points

    Hello Tom,

    We have received your question and will response soon.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    TI__Mastermind 26135 points

    Hello Tom,

    1. This question is a little interesting to answer since the SHA-1 and SHA-256 authentication is simply a way the information is processed in order to encrypt. That being said there is no modification you can make on the battery gauge encryption side since your only option would be copying the physical battery setup information from the MAX17205 on to the BQ40Z80. The only information that would need to be done is updating the MCU communication between the battery gauge.

    2-The typical use cases for SHA-1 authentication in BQ40Z80 to make sure that the user is using a genuine battery pack with there products, this would prevent the user using any battery pack with a product .

    3- I would reference section 15. Device Security to implement SHA-1

    Thank you,
    Alan