08-29-2016, 06:43 AM
(08-18-2016, 09:43 PM)listenfree Wrote: so is there any way to increase usb current from 500ma to higher
Only on the 2 GB variants by setting a jumper you connect the power lines of the USB ports directly with DC-IN so an USB connected disk can draw whatever current it needs as long as you keep in mind that you have to avoid the Micro USB connector to power the board.
So using the Euler connector pins 4 (5V) and 6 (GND), switching from PMIC to DC-IN on the 2GB variant you can reliably use a bus-powered disk. Don't think about powering the board through Micro USB in this mode, the tiny contacts and the high cable resistance nearly all USB cables show will lead to voltage drops at disk spin-up which lead to the PMIC doing an emergency power-off of the whole board.