i want make the LED matrix 10*20 .what is the micro-controller NO i use?
for help me???????
Apr 14, 2012
13 Replies
The forhelpless dud-640 of course!
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Learn something new everyday.
200 LED's you're either going to need an LED driver or learn about CharliePlexing.
You can push Charlieplexing only so far though---it runs into duty cycle problems pretty fast.
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Phil Hobbs
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
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Name an LED driver (single) that can handle 200 LEDs.
Diamond Vision?
LOL, I ment a single chip that can handle 200 LEDs !
While were at it, whats the largest single LED driver chip currently available ?
How many of those chips would it take to get to 200 LEDs ?
rote:
use?
TLC5920 does 8x16
-Lasse
You'd have to chain the LED drivers.
in DIP ICM7218A 8x8 matrix (intersil/maxim)
I think ti did a 8x16 matrix chip but I can't find it
4 (or 2 of the 8x16)
?? 100% natural
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A 40-output sink driver (I forget the part number, sorry) and a UDN28xx source driver or a few P-channel FETs will do 200 LEDs at 20% duty cycle.
Which microcontroller is an orthogonal question- just about any one will have a couple dozen bytes of memory to spare and will be able to generate the multiplex signal.
Best regards, Spehro Pefhany
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Wow, 48-pin package and you would need at least two chips.
Seems like an SPI device with 16 open collector and another SPI device with high side drivers would be a better solution.
16x16 would be 256 LEDs.Any suggestions like this ?
This looks promising.
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