From: Larry Miller (firstname.lastname@example.org)
Date: Tue Nov 14 2000 - 06:34:34 PST
I would opto-isolate the entire motor area from the rest of the system, both
grounds and power supplies. Totally separate power systems.
> -----Original Message-----
> From: mr [SMTP:email@example.com]
> Sent: Saturday, November 11, 2000 9:54 AM
> To: firstname.lastname@example.org
> Subject: [SI-LIST] : speaking of motors
> Hi everyone,
> I'm designing a board that will drive 20+ stepper motors (some 5A) and a
> few DC motors. This board also has a 50MHZ processor and several 1.8V
> PLDs also running at 50MHZ. The board will be approx. 12" x 18" with
> about 3000 parts on it.
> Because I was concerned about switching noise in the digital circuits, I
> have partitioned the voltages and the grounds: motor and digital on the
> schematic. I am planning on 2 separate physical ground planes. I plan
> that the digital section will be on one side in the corner, say the
> lower quadrant, then the analog section will be in the rest of the
> area. The through-hole connectors will be around the edge of the board.
> There may be a need to put some of these through-hole connectors
> somewhat away from the edge.
> Is there any real value in separating the voltages?
> How should these ground planes be connected? One or several ferrite
> beads? Or is there another method I should be looking at?
> How should the layers be stacked?
> Any other areas I should be concerned about or take special precautions?
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