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  • RoundRobin

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    válasz MaCS_70 #16104 üzenetére

    Itt egy leírás, amivel 500 mA-ra emelheted a portok terhelhetőségét:

    http://hackaday.com/2015/04/06/more-power-for-raspberry-pi-usb-ports/

    egy részlet, pontosabban a lényeg belőle:
    "Pin 5 on the AP2253 is connected to two resistors. One resistor goes directly to a ground plane, while the other is switched through a FET. The gate of this FET goes to another resistor, and when a GPIO pin is high, these resistors are wired in parallel. This means the resistance is halved when the GPIO pin is high, doubling the current limiting circuit in the AP2253.

    This setup provides a relatively easy mod to increase the current limiting of the USB ports so they can provide 4x500mA, meeting the USB spec. The AP2253 power switch’s current limiting can be set by a single resistor, anywhere from 10kΩ to 232kΩ. By removing R50 and R4, and replacing R50 with a 10kΩ resistor, the current limiting of the AP2253 switch will be set to its maximum, 2.1A. Divide that by four, and you have 500mA per port, just like every other computer on the planet."

    De csak saját felelősségre vágj bele, ha úgy döntenél ...

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