RE: [CAD_CAM_EDM_DRO] Re: servo driver on a chip ?

HI Dennis, Dave,

I like the EAS Microstep board:

http://www.embeddedtronics.com/

it uses a pair of National Semiconductor LMD18245 driver chips and a
Microchip PIC 16F627.

So you can have whatever microstepping you want, whatever step/dir or cw/ccw
inputs, power down, maybe even work out an encoder input?

Schematic and C source code is available (simple program). There are
probably two or three other implementations of a PIC or AVR with these two
drivers on the internet.

Alan KM6VV

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dennis Schmitz"
> <denschmitz@...> wrote:
> >
> > I don't know of any single chip solutions to drive steppers that aren't
> > married to a specific motor.
>
> There is a family of chips at Allegro and also at Sanken, although
> somehow they are the thru the same distributors. from microstepping
> to full steps, and up to 3 amps and about 35 volts.
>
> Not all are one chip solutions, some use one chip per phase.
>
>
>
> > If you can find low-voltage, low-inductance
> > steppers, you can use some single-chip DC/DC converters (integrated
> FETs) as
> > your drive and hook them up to the Robostix I mentioned before to
> drive the
> > windings. There's even enough CPU time to do resonance compensation. Not
> > enough for four channels of PID, but enough to build in microstepping.
> >
> > BTW, software is the way to go.
>
> Only if you know how to program. : (
>