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I've got this card I designed for another user, set up with 12 TCIP6B595's to drive 12 higher voltage 7-segment displays, and a couple of transistors to drive some relay coils.
I was thinking, if I wire up a 9x9x9 array, with the TCIP6B595s sinking the cathode connected columns, and adding 9 p-channel mosfet transistors to source current to each layer's common anode by pulling the p-channel gate low to turn it on, that should work pretty well as an array drive, right?
9x9 = 81 columns, and 9 more bits for the layers = 90 bits, even have a few bits left for maybe 5 special LEDs in the 4 corners and 1 in the middle or something.


* 12_digit_driver_board.jpg (673 KB, 1250x1237 - viewed 22 times.)
« Last Edit: February 23, 2012, 01:30:19 am by CrossRoads » Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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I only ever use XAND and XNAND gates.
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Sounds cool, maybe use the extra bits for one RGB LED in the center.  Also, I think you meant TPIC for that part number couldn't find any thing called  TCIP.  Looks like that chip can sink 150mA on each channel(I didn't look closely, so I may be wrong), so you might have to worry about that(?).  The TPIC6A596  can sink 350mA it looks like, so maybe that would be better?
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Yes, typo there, TPIC6B595 intended.
http://www.ti.com/lit/ds/symlink/tpic6b595.pdf

Wow, the TPIC6A596 is a monster current sink part!

As described, each part should only be sinking the current for 1 LED at a time, the TPIC6B595 should be plenty.
If several (all?) layers are all to be turned on at the same time, the TPIC6A596 would be a great part for sinking 180mA.  The board would need to be re-routed for that, pretty sure wider traces would be needed for power.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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