The is a 16 channel PWM unit with 12 bit duty cycle control (0-4095), 6 bit current limit control (0-63), and a daisy chainable serial interface. This breakout board is a good way to take full advantage of this useful IC. All 16 PWM channels are broken out to standard 0.1" headers, which run alongside convenient voltage and ground rails. Also, because the TLC5940 can be daisy-chained, the breakout is designed to support that feature. On the left-hand side of the board all serial inputs are broken out to 0.1" headers and likewise with output on the right-hand side. Project description, more information and ordering can be found at https://www.sparkfun.com/products/10616 Datasheet: http://www.sparkfun.com/datasheets/Components/General/tlc5940.pdf Arduino Library: http://code.google.com/p/tlc5940arduino/ Arduino Example: http://www.arduino.cc/playground/Learning/TLC5940 bildr Tutorial: http://bildr.org/2012/03/servos-tlc5940-arduino/