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Original question:

BQ27220EVM-744: What is correct unseal key of 27220EVM-744 ?

BQ33100EVM-001: Correct unseal key for the evaluation board

Vinod Gopal
Prodigy 10 points

Part Number: BQ33100EVM-001
Other Parts Discussed in Thread: BQ33100, , BQSTUDIO

We are evaluating BQ33100 for a new product design using the evaluation board BQ33100EVM-001. What is the correct unseal key for BQ33100EVM-001?

  • 0
    TI__Guru 57697 points

    Hello Vinod,

    The default unseal key is usually 0x0414  followed by 0x3672

    It should be documented in the datasheet or TRM

  • 0 in reply to Shirish
    Prodigy 10 points

    This is not working. It's not documented in the BQ33100 datasheet or BQ33100EVM user manual. After writing this unseal code to manufactureaccess (SBS command: 0x0), the outcome is the same: Reading dataflash pages (32 bytes per page) is giving me the values regardless of the subclass/page: 0 0 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4 b4. Please help resolve this.

  • 0 in reply to Vinod Gopal
    TI__Guru 57697 points

    Hello Vinod,

    Can you post a screenshot of bqStudio where the bits show that the device is sealed? If the default keys don't work, then it may have been changed prior to sealing