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BQ34110: Bq34110 Auto Sealed

Bob_Kang
Intellectual 510 points
Part Number: BQ34110

Recently, I met an issue when optimizing the configuration of bq34110. Some of the bq34110 chips were sealed automatically which causes that the DF cannot be re-programed anymore. The status of SEC1 and SEC0 was 11 which indicates the chip is sealed. But we didn’t do any action to make it sealed at any time during the development. Moreover, it can’t quit the sealed mode by sending command unsealed via BMS. By the way, the revision of the BMS is 1.3.54.1. 

My questions are:

1.       How can it happen?

2.       How to avoid it？

3.       How to quit the sealed mode and make it programmable again?

  • 0
    TI__Mastermind 42535 points

    Hi Bob,

    1. It is unlikely that the gauge will auto seal. It needs to be sent the seal command to seal. Please check if there was accidental comms to the gauge that sent command 0x20 to 0x00 making the gauge seal.

    2. Once sealed, if the gauge shuts down, it will be sealed when it wakes back up.

    3. To unseal you have to send 0x0414 and 0x3672 back to back without interruption to 0x00. This will unseal the gauge, to make it full access send 0xffff 0xffff back to back. After this reprogram the gauge with an unsealed srec to prevent sealing after shutdown.