For people who loves LEDs, here is a demo of the TLC5940 with PChip.
The TLC5940 is a 16-channel constant-current sink LED driver. Each channel has an individually adjustable 4096-step grayscale PWM brightness control and a 64-step constant-current sink (dot correction).
The dot correction adjusts the brightness variations between LED channels and other LED drivers. The dot correction data is stored in an integrated
EEPROM. Both grayscale control and dot correction are accessible via a serial interface. A single external resistor sets the maximum current value of all 16 channels...
You can download datasheet from : http://focus.ti.com/docs/prod/folders/print/tlc5940.html
And Digikey sells it for $4.28 in DIP package.
This demo is able to control, until 512 LEDs each color RGB, maximun.
This demo has not DOT correction and no feedback from the TLC's
The data is arranged as "longs" but they can be treated as words, since it is enough for the 4096 grayscale levels.
The necessary documentation is in the code, but ask me, if you've doubts or if I forget something.
I thinks that it is·ideal, for use with 8x8 RGB Sparkfun matrix. (I don't remember, if it comes in common anode )
Have fun and enjoy it.··
NEW VERSION !!
Envio editado por (BTX) : 3/18/2007 9:15:49 PM GMT