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BQ24297: BQ24297 REG07[5] BATFET_Disable

Kane Wan88
Prodigy 620 points
Part Number: BQ24297

Hi Team,

I have a question about BQ24297 REG07[5] BATFET_Disable.

When charging done, if charge voltage set 4.4V, REG04[0] VRECHG, Battery Recharge Threshold, set 0 (Default: 100 mV),

Before battery voltage lower than 4.4V-0.1V=4.3V, this moment BATFET should be turn off because into recharge range.

This time REG07[5] BATFET_Disable bit should be 0 or 1?

Thank you.

  • 0
    TI__Guru**** 166626 points

    Hi Kane,

    The BATFET is essentially two back-to-back FETs.  When charge terminates, only the FET that allows current flow from SYS to BAT turns off.  The FET that allows current from BAT to SYS is still on.  The BATFET_DISABLE is not a read only bit.  When the host writes BATFET_DISABLE to 1, both FETs turn off to enable ship mode as explained in datasheet section 9.3.1.2.1 BATFET Turn Off.

    Regards,

    Jeff