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Topic: How to use this led matrix.. (Read 821 times) previous topic - next topic

RGBarray

Well im terrible at using datasheets..
could anyone give me a decent explanition of this part?
Part #: ltp2558aa
weeeeeeeeeeeeeeeeeeeee

CrossRoads

Got a link to the part? That would help.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

RGBarray


Got a link to the part? That would help.

Here..
http://doc.chipfind.ru/liteon/ltp2558aa.htm
weeeeeeeeeeeeeeeeeeeee

Lakes


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.
http://www.youtube.com/watch?v=wXvs0CrRPIw



CrossRoads

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.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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