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.
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: |
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