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Original question:

BQ76952: BQ76952

BQ76952: About terminal use guide

Gabriel Wang1
Genius 4725 points
Part Number: BQ76952

Tool/software:

Dear Expert

Now we have a design plan. When connecting the 76952 to a single acquisition line, if I connect an odd numbered terminal in series and an even numbered terminal in series, not the same terminal in 16 series, and the two terminals are connected from the battery pack to the BMS board, there will be a time difference when inserting the wire. If I insert the odd numbered terminal or even numbered terminal first (at this time, B+and B - have already powered the chip), will it affect the use.

  • 0
    TI__Mastermind 25980 points

    Hi Gabriel,

    Depending on the time difference between the two terminals being connected, some protections could trigger.

    A common behavior we've seen with this method of connecting the cells is that OV can trigger.

    This is caused by the differential voltage of one or more cell inputs going negative due to the body diode of the internal balancing FET conducting the voltage of the cell below it. The internal measurement ADC is not meant to measure voltages below around -0.2V, and the body diode can cause a -0.3V voltage to appear on the inputs. The ADC will then underflow and give its maximum value instead, causing OV to trigger.

    A simple workaround we recommend to allow for as much time as you'd like to connect each terminal is to add a jumper on the BAT pin's trace that would allow you to disconnect BAT from the cells while they are being connected.

    Regards,

    Max Verboncoeur