Tomas,

You are confusing the daylights out of this old guy.

Last night (my time), under the PIC heading,  you posted that you got rid o=
f =

the drivers. Today, you are saying you are using the drivers. Huh? I have =

seen this double-posting, time-shifting routine a few times, so I'm not sur=
e =

if your posts are coming in out of order or if one of us isn't keeping up =

with where you are in your design.

Anyway, lots of hits on Google for "push pull driver". Since you didn't =

mention which datasheet you were looking at, nor what, specifically, you =

didn't understand about how it works, I can't address it. However, see if =

this helps:
http://digital.ni.com/public.nsf/allkb/0C5091E9099059BC86256FC1007947AA

Just out of curiosity, have you actually built and tested this circuit? I =

ask because it seems many of your questions would have answers specifically =

related to how you are using the parts and what your code is doing. That =

being the case, it would be relatively easy to determine current =

requirements, average battery life of different types and brands, and LED =

brightness through actual testing. I find that, in every design, there come=
s =

a point where I have to put down the pencil and pick up the meter or scope =

leads. Paper-based hardware and software analysis and computer simulation =

goes only so far.

Finally, exercise the heck out of the game and try to break it. Ask a coupl=
e =

of the neighbors to try it. They may attempt to do something you didn't pla=
n =

for - especially the kids.

Richard



----- Original Message ----- =

From: "Tom=E1s =D3 h=C9ilidhe" <toe@lavabit.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Sunday, June 29, 2008 10:01 AM
Subject: [EE] What's a push-pull driver?


>
> I know a highside driver provides a path to Vcc, and a lowside driver
> provides a path to Ground.
>
> When I heard the term "push-pull driver", my first thought was that it
> was a driver that would provide a path to either Vcc or Ground depending
> on whether the input was high or low.
>
> I've looked at the datasheet for a push-pull driver but I can't figure
> out what it does.
>
> I presume somebody knows.. ?
>
> While I'm talking about drivers, does anyone know a very efficient
> driver that doesn't have considerable internal voltage drops? (I'm using
> the ULN2003 and UDN2981 at the moment but because they've got
> darlingtons internally they've got voltage drops).
>
> -- =

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