Hi. All i spent so many hours at work, i almost get sacked because i shouldn't do that kind of stuff i have done. But i have to say it was worth to try.
My Goal was to get OTG MODE AND CHARGING AT THE SAME TIME, after i try all different possibilities from some posts on XDA DEVELOPERS FORUM finally i found solution (...)
My docking station will work with any 2012 maybe 2011 SONY XPERIA DEVICES with OTG SUPPORT. I have tested this so far on my XPERIA S and working perfect. I tested SAMSUNG GALAXY SIII but unfortunately - NOT WORKING AT ALL . I try THC SENSATION XE same thing - nothing happend. So i mad 3 "docking devices" for testing purpose. Last one seems to be BUGS FREE ;)
My dock station evolution :
1st STAGE :
2nd STAGE :
3rd STAGE (FINAL VERSION) :
The key to my success was just simple resistor . I used resistor to short pin 4 (ID) and 5 (GND) to get OTG MODE and CHARGING at the same time, if i well remember i used simple Y cable.
But i try something else later on i just connected PIN 4 on my microUSB ( going to phone ) to PIN 4 on my miniUSB ( going to HUB ) using straight wire but in the middle of the wire i put 100k-ohm resistor, so i actually didn't short PIN 4 and PIN 5 , must be shorten in the HUB , check the diagram to see how is done, make your own modifications and send me some feedback. I used extra red LED just have something else on the dock.
I try good few different resistors but exactly 100k enable OTG MODE AND CHARGING at the same time ;) i had 103k , 98k and wasn't working at all - no charging, no OTG. If i well remember on 117k battery icon change to charging icon but there was no LED on on the phone and phone actually was discharging.
Here is the diagram ( optional you can use LED to indicate that DOCK IS CONNECTED TO POWER SUPPLY )
This is my first video i made on my 2nd STAGE DOCKING STATION ( with power supply issues ) nothing really special you can skip it to next final video.
This is my last video enjoy:
here you can find my thread on XDA DEV FORUM :
Diagram updated 22/08/2012 due to little problems with OTG MODE when there is not power supply around. Also in my dock station i used permanent power supply connected to my dock, i will have to change it, i think better idea is when on the dock - as a power inlet we have FEMALE USB then on yours power supply side MALE USB, when you want to use DOCK without power supply you should disconnect power lead and hit your switch to CLOSE POSITION, to avoid RESISTOR in the circuit. Also thanks to XDA USER GEMINIU for spot the wrong marking on the diagram ( DATA + and DATA - )
Changed dock station design regarding to last update above.
New female USB on the right hand side for AC charger or any source of power
On the left hand side switch to by pass resistor for OTG MODE on without power supply