Fun with Crossplexing – Adventure with AS1130 (Ideating)

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Current Status:  Ideating, visualising and day dreaming while the samples arrive.

27 Jul 2012:
Today while browsing the net in search of LED driver, I came across an interesting IC from austriamicrosystems AS1130. The chip is a 132-LED Cross-Plexing Driver with scrolling Function. Woah, thats a lot of LEDs to be controlled by a single IC.  As at the present moment I am working on an LED clock using MAX7219 IC and given the fact that the MAX7219 can control 64 individual LEDs, the subject IC instantly grabbed my attention.

DIY-ers and Hobbyist like me are always short on money and micro-controller pins but are always big on ideas, so every pin saved is an extra functionality/blinky led added. I just glanced through the datasheet and said ‘ I must have that IC’. So I rushed to their samples page to try my luck.. and boy, I was lucky and as the things stand now.. my samples (3 in no) are on my way.
The next step, was what am I going to do with it? Since flavour of the season with me is ‘Word Clock’ .. so I have decided to go ahead and build a word clock with this IC.

28 Jul 2012:

Had some spare time, so went through the IC’s datasheet. I realised that unlike other LED drivers, this IC required LEDs to me wired up in a different fashion, its a variant of Charlie-Plexing , called CrossPlexing. Charlieplexing is the most common form of  multiplexing LEDs and it has taken me a bit of time to understand CrossPlexing wiring. I have attempted to draw a x-plexed LED matrix in eagle. It has taken me a bit of time to draw this and I am not quite sure whether this will work or not. Following is the preliminary layout

Crossplexed 132 LED Array

Also I came across a tutorial from digikey on CrossPlexing.

.. to be continued.

Ishan Karve

About Ishan Karve

Ishan Karve is just an every day normal guy next door who happens to be an Electronics Engineer by profession and dabbles with PHP, Javascript, C++ and python. His interests vary as seasons change.. they change from astronomy to soul searching. This site is just a reflection of what he does to keep his mind engaged when he is not occupied by work and family. He is an extremely objective guy and is always ready for some good arguments.. of course over a glass of 40% proof alcohol.
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4 Responses to Fun with Crossplexing – Adventure with AS1130 (Ideating)

  1. Roy says:

    Sooooo…did it work or not?

  2. Roy says:

    …always so much stuff….

    Have fun with it anyway…. :-)

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