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BQ34Z100: How to write to the Data Flash of the BQ34Z100 and BQ27Z746?

Allen Yang
Prodigy 30 points

Part Number: BQ34Z100
Other Parts Discussed in Thread: BQ27Z746, BQSTUDIO

How do I write data into the System Data of the BQ34Z100 and BQ27Z746?
I tried writing, but it was unsuccessful. Are there any additional conditions or requirements for writing?

  • 0
    TI__Mastermind 34425 points

    已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

  • 0
    Prodigy 30 points

    The attached image is a screenshot I captured from BQStudio.
    When I attempted to write, the lower left corner displayed the message: "A read of data written failed comparison."
    At the same time, I’ve also attached the data captured using a logic analyzer.

    write to 0x55 ack data: 0x3E 0x3A
    write to 0x55 ack data: 0x3F 0x00
    write to 0x55 ack data: 0x40 0x10 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00

    write to 0x55 ack data: 0x60 0xEF
    write to 0x55 ack data: 0x61 0x00
    write to 0x55 ack data: 0x3E 0x3A
    write to 0x55 ack data: 0x3F 0x00
    write to 0x55 ack data: 0x40
    read to 0x55 ack data: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
    write to 0x55 ack data: 0x60
    read to 0x55 ack data: 0xFF

  • +1 回复 Allen Yang
    TI__Mastermind 44720 points

    This is a common mistake on bq34z100

    1. Device need unseal mode.

    2.  Data flash cannot be written until the voltage is greater than flash update voltage. 

    Refer to link below

    e2e.ti.com/.../4385370