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BQ76940: Configuring for 12S configuration

Suresh Jayagondar
Prodigy 120 points
Part Number: BQ76940
Other Parts Discussed in Thread: , BQ76930EVM, BQ78350-R1

Hi,

I am trying to configure 12S 3P configuration using BQ76940.

"bq769x0 EVM Quick Start Guide" step 17 it describes Change the value to the cells supported (0x03FF for bq76930EVM, or 0x7FFF for bq76940EVM) and click on the Write to Data Memory button. 

But i want to configure it using MASTER micro (not using BQ studio), can you tel me is there any address in BQ76940 which can be used for configuration.

 

  • 0
    TI__Guru 54715 points
    Hi Suresh,
    The bq76940EVM allows evaluation of the bq76940 alone or with the bq78350-R1 gauge. There are 2 sections to the quick start guide.
    The bq76940 has an I2C interface and registers. There is no configuration for the cell count, if the voltage is below the UVMINQUAL it will not be included in undervoltage comparisons. The bq76940 does not have a configuration for this, it is automatic based on the input voltages. This allows unused shorted cells to be ignored for UV. If you system expects a voltage on a cell and the voltage is zero or unusually low, it should identify the error.
    The bq78350-R1 gauge has a cell configuration so that it knows what cells are physically connected and should have voltages. That is set in its AFE Cell Map parameter. The map describes which cells are used, it is a stored parameter in the data flash memory. The gauge then shows cells in a logical sequence.
    If you are using a micro instead of the gauge, you can determine whether to build your used cell locations into the code or to allow some configuration storage.
    If you are using a micro to configure the gauge, please refer to the technical reference manual for the bq78350-R1 for communication methods and addresses.