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Original question:

BQ76940: BQ76940

BQ76940: BQ76940

Arash Iranfar
Prodigy 70 points
Part Number: BQ76940

Hi again. Regarding your comment: "... Also be cautious of the construction and connection of references to the high current path, "ground" references can move substantially with short circuit..." it is ok to connect the GND to Earth (BAT-) with a net tie right? In the EVM pdf file, the net tie exists (7.2.3 page 44) so I used a net tie as well. In the file attached, the net tie is highlighted with a circle around it within the PDF and JPG files. This can not cause the problem (Microcontroller resets in the event of short circuit) right?

Thanks for your consideration.LFP.rar

  • 0
    TI__Guru 54715 points
    Hi Arash,
    The net-tie is an excellent way to control the connection, it should work well. The MCU referenced to GND for internal signaling should be good. With low side switching you must have isolation between PACK- and other GND referenced signals. If you have a communication port referenced to PACK- that communication port needs isolation.
    I noticed E1 in the schematic, it is a bad idea in a product since any contamination will bypass the FETs.