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BQ76952: DFETOFF pin configuration problem

mark zuo
Prodigy 150 points
Part Number: BQ76952

Hi Guys，  How to make the discharge MOS turn off when the DFETOFF pin is floating, and when it is pulled to the GND, the discharge MOS turns on.

  • 0
    TI__Mastermind 42060 points

    Hello Mark,

    You can configure the DFETOFF pin for active-high and active-low configurations in the configuration settings (See Section 13.3.2.10 and Table 13-7 of the TRM)

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 150 points

    Hi Luis，

           Thanks for your instructions ，By the way，If DFETOFF is configured to turn off the discharge MOS, will the discharge MOS turn on during charging?

  • 0 in reply to mark zuo
    TI__Mastermind 42060 points

    Hello Mark,

    No, the discharge FET will not turn on, until the DFETOFF pin is de-asserted. However, some charging is still possible as there would be some current flow through the body-diode of the DSG FET. Careful though, as this can overheat the FET.

    Typically the BQ76952 has a body-diode protection feature to protect from the FET from heating due to this flow (by turning it ON), however, this protection is disabled when DFETOFF is asserted. So I would not recommend you charge with DFETOFF asserted.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 150 points

    Hi Luis，

        Thanks for your instructions，This will greatly help me design.