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Topic: led driver (Read 1 time) previous topic - next topic


this one:

How many 4794 chips could the Arduino board handle?

Does the 4794 support 8 LEDs?


David Cuartielles


the 4794 can handle 8 simultaneous outputs, but you can daisy chain it and add more chips in series. We have a project here now with 64 double-coloured LEDs at once.

On the other hand, there is another LED driver, from Maxim, the 7219 that handles 64 LEDs at once, but that is more complicated to wire.



Thats very interesting indeed. Do you know anywhere online to buy this chip?

Do you have any documentation online about how to daisy chain it?

I have a 7219 that I am using for an LED matrix, although just starting.


David Cuartielles


If you are in Englad, you could get it from http://www.elfa.se , they sell over the net and accept credit card. Also Farnell and Digikey may have it, but I haven't searched there.

The datasheet is available in our web repository:



Flat Stanley

Hi David,

is there a more generic name for the 4794??

i'm trying to find an equivalent chip from RS (as I have an account with them) (http://rswww.com) but when i search for led drivers, i don't find the right sort of chip

Is it a multiplexer?? or ...???

Thanks a lot


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