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Erik Malund
08/11/05 15:32
Read: 1071 times
Mt Airy, Nc

#99227 - words
Responding to: Jan Waclawek's previous message
I think, this is not impossible to achieve.
I know it is not, I am doing it albeit a bit less "elegant" than the proposed chip using 3 of the ST2221A chips, one for each color. Also to use these chips I have to upload separately for each weight.

Just interested, what is the planned thermal dissipation of the chip (what kind of package)?
I do not recall, but in the last meeting was stated "we will use package xxx it's gerat for dissapation.

You undoubtly considered multiple voltage power rails for the different colour LEDs...
That would be ridiculous when employing costant current circuits the only effect of the volatge is dissapation, thus I use 3V3 for Amber and 4V for color.


List of 11 messages in thread
soliciting input for LED chip      Erik Malund      08/10/05 13:29      
   Application      Ian Bell      08/10/05 16:47      
      spi      Jan Waclawek      08/11/05 00:27      
         the constant current circuit can not be      Erik Malund      08/11/05 06:54      
            Switch mode ?      Steve M. Taylor      08/11/05 11:12      
               Ok, let me try      Erik Malund      08/11/05 11:59      
                  Photodiode      Steve M. Taylor      08/11/05 12:47      
                     nah      Erik Malund      08/11/05 13:56      
                        resistor and current      Jan Waclawek      08/11/05 15:04      
                           words      Erik Malund      08/11/05 15:32      
      I am and I will      Erik Malund      08/11/05 06:49      

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