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Altera_Forum
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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...
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Altera_Forum
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7 years ago

Thank you for the information. I tried to change the Bank voltage for 1.8V in GPIO_1 bank for using just only one pin from it and the rest from GPIO_0. I measured the voltage from the pin and it still has 3.3V . Is there something that I did wrong? Or when you said that external circuitry is required, you meant that changing the IO bank on Quartus II will not reduce the output voltage ?

Regards,

Marcio

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Hi,

This error occurs when a bank is using vccio=3.3V and we try to use 1.8 V for one/ more pins in the same bank in your design.

  1. We can't change voltage for a single pin in the Bank, You can change the VCCIO for the entire bank.

  2. External circuitry is like a level shifter are required.

To change the voltage of an I/O bank using the Pin Planner refer below link.

https://www.altera.com/support/support-resources/knowledge-base/solutions/rd08172009_2.html

Best Regards,

Anand Raj Shankar

(This message was posted on behalf of Intel Corporation)

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