On Wed, Feb 6, 2013 at 1:34 PM, Siji Sunny <[email protected]> wrote: > It seems like the usb controller used* *in Rspberry pi SOC (Broadcom > BCM2835) has some serious issues , since it can only supply low amount of > current to its USB devices (Approximately 140 mA). This will cause > continues restart of RPI specially while connecting USB Network Card, USB > Modem or GPS devices.
>From what I've read, it is an issue of the USB on the chip w.r.t to power draw. Powering on by USB gives 500mA while the Model B needs 700mA at peak. So a 1A power source is recommended instead of the PC powered mode. Higher power draw by the USB causes the thresholds to falls for the internals and thus the reboot. To avoid this, polyfuses have been used on the board to restrict the power draw to 140mA. I had flagged the same problem as USB wireless did not seem to work well (speed lags) and traced it to the possibility of low power draw. I tried a powered USB hub and the RPi gave problems in identifying the device. My streaming media problem got solved by dedicating a router (54Mbps) for my link between the RPi and the server. The buffering disappeared. I believe the ModelA has been released and draws 300mA peak. This may give more power to the USB than before. -- Mohan Sundaram _______________________________________________ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
