08-12-2021 01:54 PM
Hello,
I am using 6501 port 1 to read digital logic of my circuit output. In 6501 port pins have +5V and 4.7K pull-up resistors. Up to what voltage on the port pin (configured as digital input), 6501 declare as LOW and HIGH?. I read elsewhere that voltage between 0 to 0.8V will be reported as logic 0 and voltage above 2V will be reported as Logic high. Is this correct?
Thanks,
Leyo Joseph
Solved! Go to Solution.
08-12-2021 02:11 PM
When in doubt, read the scpecifications: USB-6501 Specifications
@LeyoJoseph wrote:
I read elsewhere that voltage between 0 to 0.8V will be reported as logic 0 and voltage above 2V will be reported as Logic high. Is this correct?
After reading the specifications...Yes, that is correct. Those are fairly standard voltages for TTL.
08-16-2021 09:11 AM
Thanks.
One more question on this, please. I think there is a way to change the +5V operation top +3.3V by setting some parameters of 6501. How to do this?
08-16-2021 09:40 AM
@LeyoJoseph wrote:
I think there is a way to change the +5V operation top +3.3V by setting some parameters of 6501. How to do this?
As an input, it will accept 3.3V levels. But as an output, it will use 5V levels. You can use a level shifting circuit to change logic levels, for example a SN74LVCC4245APWR.