Timo Juhani Lindfors wrote: >> My assumption is, that it takes far more than 2.5W, since the USB dongle > > How about measuring that? Just read the current_now file in /sys.
Telephony can have very high current peaks, in the order of 2 A. They are only short, i.e., the size of some transmit time slots, so the average current is much lower, but if a design doesn't adequately buffer those peaks, there will be problems. Problems should get worse in areas with poor or no reception. Monitoring rapidly-changing current is difficult, but if current peaks cause a voltage drop, that could be detected by measuring USB VBUS with an oscilloscope. - Werner _______________________________________________ devel mailing list devel@lists.openmoko.org https://lists.openmoko.org/mailman/listinfo/devel
