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Tusb2046B charging a iphone/ipod

Marcelo Augusto Garbuli
Prodigy 50 points
Other Parts Discussed in Thread: TUSB2046B

hello all;

 

i designed a pcb with a tusb2046b hub with 3 usb ports. the project works fine.

but, if i keep the 5vcc from a different source than pc usb and put a iphone or ipod in the usb outputs, the device don´t charge the battery, the iphone dont show the charging message....

what can i do?

tks

 

 

  • 0
    TI__Guru* 76130 points

    Hello Marcelo,

    Can you send your schematic for review.

    Is the TUSB2046 active(communicating with the host) when you try to use the current from the downstream port?

    When a hud is in the suspend state, it can not source more than 500uA for low-current devices and 2.5mA for high-current devices.

    Also, when a downstream device is not configured it can not draw more than 100mA.

    What are the current requirements to charge your ipod?

    Regards.

  • 0 in reply to Elias Villegas M.
    Prodigy 50 points

    Hello, thanks for reply

     

    here is the schematic:

    http://www.flickr.com/photos/falcosms/7486793210/in/photostream

     

    the connector cn4 come from pc usb and i have another external power supply of 5vcc 1A. when the pc is not conected, the smps supply the board, disconnect the tusb by fet Q2 and connect the resistor divider in the output usb cn3, to allow iphone/ipod to charge without pc.

    when the pc is connected, the tusb is on and the resistor divider is disconected by ports 4066. i checked that with the resistor dividers r14,r2 and r15,r1, the tusb doenst work.

    is a good way to make the charger??

     

     

  • 0 in reply to Marcelo Augusto Garbuli
    TI__Guru* 76130 points

    Hello Marcelo,

    The D+/- lines have no means to charge a device or to provide current. These lines are the differential USB signals signal. If you would like to charge some device from a USB port you will need to do that by the 5V pin of the usb connector, the TUSB2046B does not have nothing to do with the 5V signal if the USB connector. The hub is not working because you are connecting a 47k resistors on the D+/- lines, so the voltage level required by the spec are not met and the host can't communicate with the downstream devices.

      Regards.