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MAXII LED Driver AN286

Altera_Forum
Honored Contributor II
‎04-18-2011 08:47 AM
1,379 Views

Hello, 

 

the AN 286 decribes implementing LED Drivers in MAX devices. The maximum source/sink current is dependend on the number of GNDIO/VCCIO groups. 

 

Is a group identical to the number of GNDIO/VCCio pins? Is it theoretical possible to sink 16x 130mA using a EPM2210 (16 VCCIO/ 16 GNDIO pins) 

 

Thanks for help 

 

Volker
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Altera_Forum
Honored Contributor II
‎04-21-2011 07:01 AM
632 Views

The answer from Altera support makes me a little bit confused. 

Does anybody understand the answer of Q2? If I have a look in the pin out file of EPM2210 I count 20 regions... 

 

Volker 

 

Following the anser of the support: 

 

[Q1]: Is a group identical to the number of GNDIO/VCCio pins? 

[A1]: A group means a set of I/O pins between any two VCCIO pads or any two GNDIO pads.  

As an example is quoted in the handbook, the EPM240 device has six GNDIO pads, which provide six I/O regions that can sink up to 130mΑ. If you need to sink 15mA for the outputs, you can have eight outputs per region. With the six regions of I/O between GNDIO pads, there are 48 possible outputs, each sinking 15mA.  

 

For more information about GNDIO grouping, refer to the MAX II Device Pin-Out Files, and the MAX 7000B Device Pin-Out Files. These files are on the Pin-Outs page of the Literature section of the Altera website.  

 

[Q2]: Is it theoretical possible to sink 16x 130mA using a MAXII EPM2210 (16 VCCIO/ 16 GNDIO pins)?  

[A2]: No, the maximum sink current per group is 130mA, as stated in AN 286 application note, Table 3: Maximum Source Current for Each VCCIO Group and Maximum Sink Current for Each GNDIO Group in MAX and MAX II Devices.  

16 x 130mA = 2080mA is already exceed the 130mA maximum rating, which may have adverse affects on the device.
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Altera_Forum
Honored Contributor II
‎05-20-2011 09:36 AM
632 Views

Hi, 

 

Altera answered my question: 

 

 

Hi Volker, 

 

Yes, you are right. There are 20 regions in total. EPM2210F256C5 is a 256-Pin FBGA device. The EPM2210 will have more regions as it has more I/O pins compare to EPM240 devices, which only have 100 pins. Therefore, it is expected to have more regions in EPM2210 device.  

 

I replied to this answer if so its possible to sink 20x 130mA= 2600mA with this device. The FAE answered that these asumption is correct... 

 

Volker
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