Help with STP16CPS05 led sink driver for a cube led

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luiscarlosnew

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I have a doubt in this project: http://picprojects.org.uk/projects/lc/

**broken link removed**
**broken link removed**

http://picprojects.org.uk/projects/lc/cube555cS.pdf

For images, I do not understand how STP16CP05 is working, because it is providing current up and not down. And even if it was mistake in the direction of current, such as placing the IC in that place since it only provides power and does not make the continuation of a circuit.

Help me with this problem
 
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