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Adventurer
Adventurer
4,090 Views
Registered: ‎11-15-2010

Power consumption Calculation

Hi,

 

I'm trying to figure out how "big" have to be my DC-D regulators for  my XC7K35TFBG676 power supply

 

In particular, for banks, I try to find the worst case: the highest current an IO can need and multiply it by the number of IOs. I do not wanna spend time in a fine estimation/calculation.

 

The highest "drive strength" is 16 mA, for most kinds of outputs. 

A 3.3V signal driving a 50 Ohms load, would sink 3.3/50 = 66mA.

The dynamic current driving a 3.3V - 10pF pin at 100 MHz would be = 3.3mA

 

How can I use all those different parameters?

 

Am I right thinking that a 50 IOs bank can not need more than 1A at 3.3V? 

 

I'd like not to have to spend too much time filling out the Power Estimator Excel sheet...

 

Thx!

 

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2 Replies
Xilinx Employee
Xilinx Employee
4,047 Views
Registered: ‎08-02-2007

Re: Power consumption Calculation

The power estimator spreadsheet is a very quick spreadsheet.  You dont need a design file, just enter your numbers.  If you are still looking for a quick estimation, i'd just use it:

http://www.xilinx.com/products/technology/power/index.htm

 

Regards,

Jon

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Visitor aolofsson
Visitor
4,032 Views
Registered: ‎07-10-2012

Re: Power consumption Calculation

Jon is right,the power calculator is a greeat spreadsheet for quickly estimating power.  Based on your description, putting a 1A regulator would leave you a very big margin, but you could probably save money and power if you dialed in the exact number with the power calculator.

Andreas

 

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