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Author Topic: How to use this led matrix..  (Read 640 times)
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Well im terrible at using datasheets..
could anyone give me a decent explanition of this part?
Part #: ltp2558aa
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Got a link to the part? That would help.
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Arduinoland ;)
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Got a link to the part? That would help.
Here..
http://doc.chipfind.ru/liteon/ltp2558aa.htm
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Well im terrible at using datasheets..
could anyone give me a decent explanition of this part?
Part #: ltp2558aa
General tutorial on how to use these.



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Okay, according to Figure D of the datasheet, you have 16 anodes per column, and 8 columns with the cathodes for those 16 LEDs connected together.
To drive the part you would generally connect up two shift registers with a current limit resistor to the anode pins.
You would put connect shift register such as a TPIC6B595 on the cathode pins to sink the current from up to 16 LEDs.
Or a transisor array like ULN2803 with another basic shift register (or arduino pins even) as a current sink buffer.

Then you write a multiplex loop:
Write the anodes high/low for column 1, bring the cathode low for that column for a 1mS. Bring the cathode high.
Repeat for columns 2-7.
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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.
Arduino for Teens available at Amazon.com.

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