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BQ27426EVM-738: ChemID Tab missing

Martin Ranger
Prodigy 20 points

Part Number: BQ27426EVM-738
Other Parts Discussed in Thread: BQSTUDIO, , BQ27426

How to change the ChemID when using the bq27426EVM and bqStudio?

According to figure 8 in User Guide bq27426EVM-738 (SLUUBE1) there is a Tab for changing the Chemistry.

We have downloaded bqStudio version 1.3.101 today. There is no Chemistry Tab in this program version. How to change ChemID to 3142 when using bqStudio?

  • 0
    TI__Mastermind 45765 points

    Hello,

    This question has been assigned within the team and will be reviewed and followed up with another application engineer when possible. In the meantime please attach any associated .log/.gg files associated with the projects

    Thank you,
    Alan 

  • 0
    TI__Genius 9745 points

    Hello Martin,

    This device does not support the ChemID tab. You need to send the command CHEM_A, CHEM_B, or CHEM_C accordingly to the gauge to make sure the gauge configures it. You can do this through the I2C ADVncae comms in the bqstudio:

    • Command 00,
    • data 0x3100, 0x3000, or 0x3200.
    • Write
    • Like this...

    The TRM contains an example of this procedure, but in short...:

    1. Read the ChemID. Should be the default
    2. Send the SET_CFGUPDATE command to the gauge
    3. Send the CHEM_X command
    4. Send the Soft_reset command
    5. Read the ChemID to confirm this is done

    Let me know if you have more questions

  • 0 in reply to Miguel Castro Gonzalez
    Prodigy 20 points

    Hi

    Thank you for the information.

    I have used the Advanced Comm Tab and sent the commands. When confirming the ChemID after the change the device reports the new ChemID.

    I also checked the Data Memory Tab. The fields related to Ra Tables and Chemistry Info are updated.

    So far so good.

    The Configuration part of the Data Memory Tab shows the value of OpConfigD. Both bits 3 and 4 are still 0. Why is this info not updated when sending the command to change the chemistry?

    Regards

    Martin

  • 0 in reply to Martin Ranger
    Prodigy 20 points

    Hi again,

    When can we continue solving this issue?

    For me it's still unclear what chemistry info used by bq27426 when calculating State of Charge. After sending the command 0x0032 to change the ChemID, the command 0x0008 does not return the same ChemID as stated by bits 3 and 4 in OpConfigD.

  • 0 in reply to Martin Ranger
    TI__Genius 9745 points

    Hello Martin,

    Those bits don't have an impact on which ChemID is being used. If you already sent the CHEM_X command, and you read back the expected ChemID, then you are good. Those for information only and set by the user, but they don't have an impact.