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TIDA-01093: the voltage sampling of the low 8 cell and the High 8 cell is very large difference

tony li61324
Intellectual 500 points
Part Number: TIDA-01093
Other Parts Discussed in Thread: BQ76930

Dear Tier

         We have designed the cell system with reference to TIDA-01093. It is now found that the voltage sampling of the low 8 cell and the High 8 cell is very large difference, and the acquisition voltage is shown in the figure below. Do not know what caused the cause, how to solve?

  • 0
    TI__Genius 10830 points
    Hi Tony,
    Our team is currently enjoying the Thanksgiving break and will come back to you when we return, during the week of November 26th.

    Thank you for your understanding.
  • 0
    TI__Prodigy 590 points
    Hello Tony

    Here are some questions for your test to understand more details

    Did you use the voltage divider to simulate battery or the real cell ? what's the voltage you applied ? and whether there is charging or discharging current ?how about the current consumption of two bq76930？

    Can you share us the schematic and layout ?

    Thank you
  • 0 in reply to Jessica LI
    TI__Guru 54715 points
    Hi Tony,
    If an inaccuracy affects a group of cells, check for mechanical stress on the part from board assembly causing a shift. If it is a single cell look for current into the supply or input pins as Jessica suggests. A current into VC8 and out VC7 could cause a low voltage on the cell while slightly raising the adjacent cell voltages. A current to VSS would make one cell read low and another high. In addition to the IC check leakage in capacitors or flux residue or other contamination on the board.
    Mentioning the schematic and layout, you may be working this with your local TI support people. Since it has been a week since Jessica's post, I will mark this as "thinks resolved". Please reply if there are remaining questions or post again.