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BQ25792: I2C to turn off both the input and output FETs

JDJ
Expert 4506 points
Part Number: BQ25792


Tool/software:

I am trying to understand if we can leverage an I2C message to turn off both the input and output FETs based on our desire. For example if we decide to prohibit charging and prohibit feed-through SYS power can we do that or the state machine not changeable within the IC?
  • 0
    TI__Guru**** 167716 points

    Hi JDJ,

    Regarding 1, both input MUX FETs can be turned off using REG0x12[7] even with valid voltage at VACx.  Regarding 2, there is no way to turn off the internal battery FET diode.  Some customers have added an external PFET, with pull up resistor and NFET gate driven by GPIO if battery >1S, to disconnect the battery from BAT pin.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Expert 4506 points

    So with a valid I2C command we can stop power to the system from the VBUS line even if that means the IC and system completely lose power (without a battery case). Would the IC come back up and default on or would we need battery power to allow the system to send the I2C message and turn us back on again?

  • 0 in reply to JDJ
    TI__Guru**** 167716 points

    Hi JDJ,

    Yes.  As long as there is a valid voltage at VACx but ACDRVx off and no battery, I2C is still available.

    Regards,

    Jeff