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BQ2040: BQ2040

Thomas Benevides
Prodigy 25 points
Part Number: BQ2040

Tool/software:

Having trouble with the voltage calibration.   The application is a Li-ion 7 cell at 4 V per cell = 28V.   Page 3 of the datasheet describes the in-circuit resistor values  in Chart 1 only to 4 cells.  How are the values derived for this application with 7 cells?    The design is using a D5 = 4148 diode with a Q1= 2N7002 MOSFET in the Vcc input with R11= 2 Meg ohms  R5= 1.4 Meg ohms, R4= 100K  to get  divider ratio of 15 to 1.

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  • 0
    TI__Mastermind 27321 points

    Hello,

    The BQ2040 is not specifically designed for direct multi-cell monitoring or management in a 7-series (7S) Li-Ion configuration. It’s a fuel gauge IC that tracks capacity via coulomb counting and communicates over SMBus, typically working with an external microcontroller or battery management system (BMS) for multi-cell setups. To configure it for a 7S Li-Ion battery pack, you’d need additional hardware (e.g., a cell monitoring/protection IC) and careful software setup.

    The BQ2040 isn’t ideal for a 7S configuration due to its age and limitations. For a 7S Li-Ion pack, consider a modern alternative like the BQ41z90.