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BQ76920: BQ76920 modify value issue

chiayuan li
Prodigy 190 points
Part Number: BQ76920
Other Parts Discussed in Thread: BQ76940, , BQ78350, , BQ78350-R1

Dear all,

I have a question about modify value in bq769X0 Evaluation Software,

For example, i want to change OCD_T3 value from "0000" to "1111", but this command will auto recovery to "0000".

Command enable,

Although i use update display and save configuration then reload file button, both of them can not write commands into IC.

How can i write commands into IC?

thanks and best regards.

  • 0
    TI__Genius 10830 points
    Hi Chiayuan (you again :-)),
    Your post has been assigned to one of our BMS experts.

    Regards,
    David
  • 0 in reply to David Hien
    TI__Guru 54715 points
    Hi Chiayuan,
    The bq76940 Evaluation Software allows manipulation of the register values for evaluation. If you are using the device alone with the software you can write the value with the tool at the top of the window or by entering the value in the bit field box as you have circled. The value should update.
    However if you are using a MCU with the bq76920 realize that the MCU may also change register values.
    When used with the bq78350 on the bq76920EVM or with any bq769x0 device, the bq78350-R1 will control the register values and periodically check that the settings it made are still present. If altered it will change the values back to what it wants set based on its configuration. If it finds the registers changed too many times it may set an error. To change the Protect 2 register change the AOLD Threshold and Delay parameter in the bq78350-R1 data memory.
    This software can be useful to check register values, but realize that the bq78350-R1 does not expect to share the I2C bus to the monitor. If there is a bus collision the bq78350-R1 will use most of its timeline trying to communicate with the bq769x0 and may not respond to SMBus commands.
  • 0 in reply to WM5295
    Prodigy 190 points
    Hi WM5295,
    Thank you for your information, it is helpful to me.