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BQ24251 Register #2 current limit settings

Rudy Garcia
Intellectual 380 points
Other Parts Discussed in Thread: BQ24251

Let say I write Register #2 bits 6:4 (I_IN_ILIMIT[2:0]) to 3’b000 (100mA) while in Host mode and then the WD timer expires and the charger goes into Standalone mode. In this mode the current limit will use the external resistor setting for the current limit. Sometime later, I access the charger via the I2C and the charger is now in Host mode. Will a read of Register #2 bits 6:4 (I_IN_ILIMIT[2:0]) return 3’b000 (100mA) or is it unknown?

  • 0
    TI__Guru**** 166996 points
    If you leave host mode, the bq24251's input current limit returns to the D+/D- detected state. The ILIM register does not report the current limit associated with this state. When you return to host mode, the default ILIM is external resistor.