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BQ2460 - Charging with host processor off

Ryan Mazur
Prodigy 175 points
Other Parts Discussed in Thread: BQ24253, BQ24251

Is it possible to charge when the host processor is in an off state?

I am looking at this series of parts because it can look at D+ and D- to detect a dedicated USB charger. This is a required feature for my application.

Is there any way to use an i2c charger when the host processor is completely off? It seems it may work, but will set the USB current limit to 100mA which is too low.

Are there any parts that satisfy these requirements:

     - Charge at 900mA if connected to dedicated USB charger, regardless if device is powered on or off

     - Charge at 500mA if USB host will allow that much current, regardless if device is powered on or off

Thanks.

  • 0
    TI__Mastermind 32350 points

     

    Hi Ryan,

      If the host is not communicating to the device, the default mode will be set till the host start talking to it.

     D+/D- detection allows the charger to detect the type of the USB is connected to it and limits the current accordingly.

     Please see the bq24251 (i2c+SA) or the bq24253 (SA only device)

     Thanks

    Tahar

  • 0 in reply to Tahar Allag
    Prodigy 175 points

    Thank you for suggesting that part. The I2C and standalone capability is interesting!

    A have another question (I should maybe create a separate question on the forum). Are there any parts that have a programmable Vsys and maintain the I2C/standalone capability? I would like to have Vsys set to 4.0 to 4.2V when the battery is dead, not 3.5V.