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BQ76940: AFE Design Review

Muralikrishna Konukati
Prodigy 170 points
Part Number: BQ76940

Hi,

We are using BQ76940 BMS in our design. Can you please review my AFE design section and need your valuable feedback's if any changes or additional features to be added.

bq76940.pdf

  • 0
    TI__Guru 54715 points

    Hi Muralikrishna,

    The bottom of C32 should connect to GND rather than VC0.

    The input filter caps Cc (C1, C2, C3...) may be smaller, such as 0.22 to avoid voltage errors observed during cell balancing due to filter settling.  If you are using an EVM you can see this in the EVM.

    R23, R27, and R32 were provided on the EVM as current sense measurement shunts. You don't need these for operation, single resistors (R22, R26, R31) are suitable for the device, you have the commonly recommended values.

    Be sure to operate the board with the thermistors attached or substitute resistance to avoid an XREADY condition.

    The application note https://www.ti.com/lit/pdf/slua749 covers various topics common to designing with the BQ76940, refer to this if helpful.