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Altera_Forum's avatar
Altera_Forum
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15 years ago

Problem with the pin of the character LCD on Cyclone III FPGA Development Kit

Hi, I have a problem, i try to use the PIN of the character LCD for other input/output. And i have a problem, the output is at 0.9V for a low signal, and at 1.9 for high signal. I set the vo...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

What is the pin, and device you are using and the exact FPGA development board you are using?

It sounds like you are trying to drive a higher current load than the output can handle..

Typically you will not get 2.5 and 0, because there is still the transistor drop to consider, but the 2.5 CMOS output should still be able to proved 2.0 and 0.4 at it's state current drive strength.

If you are attempting to drive a higher load current then the rated level, then 1.9 and 0.9 levels are possible.

Pete