USB charging, part 1: requirements
USB charging, part 1: requirements
Posted Jul 11, 2016 10:13 UTC (Mon) by neilbrown (subscriber, #359)In reply to: USB charging, part 1: requirements by giraffedata
Parent article: USB charging, part 1: requirements
1 second is certainly enough for a u-boot to be loaded and do something useful. I don't know if it is long enough to complete usb negotiation, but I suspect it is.
But for many processors, 100mA isn't enough to execute any instructions, let alone load the boot-loader from nand-flash which is most likely where it is. There maybe be some Linux-capable platforms which can run the boot-loader with only 100mA, but I doubt they are common.
But for many processors, 100mA isn't enough to execute any instructions, let alone load the boot-loader from nand-flash which is most likely where it is. There maybe be some Linux-capable platforms which can run the boot-loader with only 100mA, but I doubt they are common.