Forum Discussion
BrianSune_Froum
Contributor
ContributorCyclone V custom board VCCIO puzzling behavior
Dear Intel and all, I am working on Cyclone V soc 5CSEBA5U19C8N. There is a very puzzling VCCIO behavior. According to "Cyclone® V Device Family Pin Connection Guidelines PCG-01014-3.2". Any 3...
There are new measured data.
If I attached a simple 10k resistor to the 1.2V rail. it will drop back to normal 1.2 range.
But the loaded /w 10k is still measuring 40mV higher than unloaded DCDC w/o the FPGA chip.
So there are some leakage current inside the diode path? from VCCPD to VCCIO?
BrianSune_FroumContributor
Contributor@FvM
I am afraid even with more board had assemble the same issue are kept. without any load aka resistor or other IO driver sink/source from any pins. There is always a raise voltage on 1.2V VCCIO /w VCCPD 2.5V from 1.2V to 1.45
