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BQ40Z50-R1: after sent 0x30 command,Disconnect the battery and reconnect,It becomes unseal state

john xiao
Intellectual 470 points
Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: BQ40Z50EVM-561,

Dear All:

I test the BQ40z50EVM-561,after sent 0x30 command,the SEC1 and SEC0 is set 1,when Disconnect the battery and reconnect,It becomes unseal state,the SEC1 is set 1 and SEC0 is set 0.after sent the 0x41 command,the SEC1 and SEC0 again is set 1.What happened?Please tell me the reason.Thanks a lot.

  • 0
    TI__Expert 4645 points
    Thanks for the question. I am not aware of any way to unseal the part unless you go through two-step sequence described in section 10.5.2. Once the bq40z50-R1 is SEALED mode, the gauge can never permanently return to UNSEALED or FULL ACCESS modes.
    Please send a log of the sequence you are doing, along with the .gg file for your configuration. Please verify that the [SEC1][SEC0] flags are set after the 0x0030 command is set, and then disconnect and re-connect the battery. Please log this entire sequence. Thanks.