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BQ24050 and wall charger detection

Stefan March
Prodigy 10 points
Other Parts Discussed in Thread: BQ24050

The bq24050 detects a mini-usb wall charger if there is a shortcircuit between D+ and D-.

If i connect a wall charger slowly, the bq2450 only sees +5V and GND from the usb connector because of usb geometry (5V and GND have longer Pins than D+ and D-).

In this case the battery charges with 100mA instead of 500mA because it only looks for a connected usb powersource at startup.

What can i do to detect a usb wall charger in all cases?


Thank you very much!

  • 0
    TI__Mastermind 31120 points

    Designed into the algorithm, there is a 500ms delay waiting for a trigger to run the detection.  This is for the case you are referring to.

    Sorry, it someone is slower than 0.5seconds to slide the connector into the port an additional 50 mills, then they are out of luck.

    To get the 5V from the port the USB plug has to already be aligned and inserted into the connector a fair amount so one would have to try and slide the connector as slow as possible to get the 100mA detection.