This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76952: DFETOFF pin configuration problem

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.

  • 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

  • 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?

  • 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

  • Hi Luis,

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