gcp

Hi,

Could someone help us. We are trying to interface a ublox SARA U270 EVK as a DCE modem into a pmod zedboard FPGA board as a DTE . We used the Pmod RS232 module just to have a direct conection to the pmod pins of the zedboard. Since, the ublox SARA U270 is a DB9 male type, we used  the Male-Male DB9 cable converter using the straight-through cable connection in order to have a coonection to the Pmod RS232 and then to the pmod pins of the zedboard. Before connecting to the pmod pins in the zedboard, we checked  first the voltage levels of the output pins in the Pmod RS232 when ublox SARA U270 is only in power (zedboard is not yet connected). Upon checking the voltage using the multi meter device, the Rx pin reading is variable from 3V to 4.20V.  Our understanding also in the pmod pins on the zedboard is that the voltage level allowed is only 3.3V. Through these readings, our undertanding is that the 3.3V pin will received the 4.20V from the ublox SARA U270 that will eventually damage to the pmod pin on the zedboard. Do we have a correct understanding on the issues? If not, can somebody enlighten us? 

Thanks.

Best regards,

glenn

Dear malexander,

Greetings!!!

I am a beginner of the zybo product of digilent. After following some of the tutorials online,  when we (inset Dhen) plugged it again, unfortunately, it did not power on.  May I know what are the possible problems in the setup? Is there have an impact of using high voltage power (let say 19V power input) on the board? We so much appreciate your feedback on the matter.

Thanks and God bless you...

Best regards,

Glenn