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VCCINT Current consumption CycloneII

Altera_Forum
Honored Contributor II
‎04-21-2010 05:54 PM
1,146 Views

Hi, 

I redesigned a control card from originally using a Cyclone to CycloneII. While the Cyclone (EP1C6T144) based card required just 10 to 15mA on VCCINT, the Cyclone II (EP2C8T144) based card now requires 45mA on VCCINT even with the FPGA hold in reset (nConfig connected to GND). 

Are these "normal" figures? I thought the VCCINT current may increase, as the EP2C8 has more logic cells and is powered by 1.2V rather 1.5V for the Cyclone, but nearby 3times higher current? :confused:  

 

Thanks, Carlhermann 

 

Edit: 

I did another test with a pre-heated (60°C) unit and used a hot air gun to heat the FPGA quite a little bit more... This caused the 3V3 current (which is the summarized VCCIO, VCCINT and PLL voltages) to rise by additional 40mA. I'm currently using the commercial grade type, would this additional rise be minimized with the industrial range type, as this has a higher operational temperature range by itself? 

 

Thanks again
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