Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
7 years ago

Changing single GPIO Pin output voltage

Hi, I am trying to do connect a video camera (OV7670, from Omnivision) on altera DE2 (EP2C35F672CN - Cyclone II). I got stuck on one question: I would like to avoid using external circuitry to...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
7 years ago

You need to check the VCCio voltage for that Bank in question. If it is set to 3.3V then the pins in the bank will be set to 3.3V only. On the other hand if you have like a jumper to change the VCCio on the board between 3.3V and 1.8V then you can change the jumper and set the voltage to 1.8V. Be warned though, changing the Bank VccIO voltage will affect all pins in that Bank. You cannot change only one pin or selected pins to a different voltage in a Bank. Check if you have any other unused GPIO bank and what voltage VCCio is driving it. If so, then change the Voltage standard for that Bank and try.