1 Reply Latest reply on May 13, 2015 10:27 AM by DiegoV_Intel

    help Expansion board for Edison


      I designed this board for Edison . but when not powered on , the board no activities . When mounted Edison , I measure the resistance between the source leg 1.8v , 3v3 and  Vsys and there was no touch . But when i put Edison mounted  so 3v3 and 1.8v voltage again by almost Vsys . Then I take out the standard Edison Vsys foot , 3v3 1v8 has resistanced . Please help me find error. And my Edison is warm. sorry for my language course limited. Thanks so much.

        • 1. Re: help Expansion board for Edison

          Hi DuyTan,


          It seems that there is a short circuit in your board or in the Edison. I have checked the schematic you attached and I would like to know which value the potentiometer is set. As I can see in your design, you are using the following configuration for the voltage regulator:



          Using as R1 the 220 resistor that appears in your schematic you will get a minimum output voltage of 1.25V and a maximum of 6.93V, so the potentiometer should be set to 536.8Ω approx. in order to get a value of 4.3V for Vsys. Did you measure the value of Vsys? If it was above 4.5V the Edison module is probably damaged and it is causing the short circuit in your custom board.


          If you have another expansion board like the Mini-Breakout Board or the Arduino Expansion Board you could mount your Edison in one of them and test it to be sure if it is damaged or not.