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Altera_Forum
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15 years ago

Low impedance in supply pins ALTERA HARDCOPYII

Hello to all This is my first time in the forum and I would like to explain my problem. I am working with the ALTERA HARDCOPY II device and we are testing the boards using an ICT. The units ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I guess that the measuring circuit of the ICT is very much alike that of a multimeter (using same components?). If you put a multimeter to a low ohmic range and then measure the open circuit voltage with another multimeter you will probably measure 1.2V or more. This 1.2V will try to power up the device, and thus report a low voltage. E.g. on an EP2SGX60 I measure 3.0 ohms on VccInt.

Maybe we could try this : add an 100 ohm resistor in series and put also 100 ohm in parallel with the power pins to ground. This will halve the voltage over the power pins so they won't try to power up?