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I was just checking out the AS1130 and I was wondering how you are able to drive a 12x11 array of LEDs using only 12 wires? Could anyone explain this to me?

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It works by what they wrongly call "Cross plexing", see Figure 24 in the datasheet. An excerpt of this figure is shown here, which demonstrates 3 pins driving 6 LEDs.

enter image description here

What it should really be called is "Charlieplexing".

With Charlieplexing \$n\$ pins can drive \$n^2-n\$ LEDs.

So 12 pins can drive \$(12*12)-12 = 132\$ LEDs.

Wikipedia has a page all about it:

http://en.wikipedia.org/wiki/Charlieplexing

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  • \$\begingroup\$ That is exactly what I was looking for. I kept searching for cross plexing and couldn't find anything. Thanks! \$\endgroup\$ – Tarmon Oct 7 '11 at 20:21

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