[dorkbotpdx-blabber] How many LED's can I run off of an atMega644p?

[Eric Garner]

these are what dan is ordering:

digikey: 296-9015-5-ND http://focus.ti.com/lit/ds/symlink/tpic6c596.pdf
digikey: 296-2020-5-ND http://focus.ti.com/lit/ds/symlink/tpic6c595.pdf

they can source/sink some pretty hefty current



On Mon, Mar 9, 2009 at 4:07 PM, Daniel Johnson <teknotus at gmail.com> wrote:
> On Mon, Mar 9, 2009 at 3:43 PM, Eric Garner <garnere at gmail.com> wrote:
>> The shift registers that dan is ordering this week are a nice option
>> too(sorry I don't have part numbers, there's no copy/paste on this thing)
>
> What Hans is talking about seems to be a shift register with a
> programmable current limiter so that you wouldn't need to have a bunch
> of resistors between the outputs, and LED's.
>
> I was thinking more along the lines of an 8 bit parallel latch,
> buffer, register thingamajig.  Just needs to up the current on each
> pin.  I have but one SPI interface, and then I have around 30 other
> unused pins if I am going with the shift register route.  I guess that
> is okay, but it isn't the solution I was looking for.
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-- 
--Eric
_________________________________________
Eric Garner