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?
FvM
Super Contributor
Super ContributorHi,
I understand that the effect is unexpected. However VCCIO supply of most FPGA boards will absorb uA range leakage currents unnoticed, thus it might be that observed VCCD to VCCIO leakage current is quite common.
Regards
Frank
