I have a circuit board with a L= 6474 stepper motor driver.=C2=A0

Nicklas, I don&#= 39;t see a difference between the L6470 and the L6474 (aside from price).= =C2=A0 What made you go with the L6474?

On Wed, Jul 11, 2018 at 10:= 06 AM, Rob Butts <r DOT butts2 AT gmail DOT com> wrote:

Thanks, now I understand the pi number= after the net name.

On Wed, Jul 11, 2018 at 9:= 39 AM, Stephan B=C3=B6ttcher <geda AT psjt DOT org> wrote:
"Rob Butts (r DOT butts2 AT gmail DOT com) [via geda-user AT delorie DOT com]"
<geda-user AT delorie DOT com> writes:

> I believe Stephan's solution is what I'm looking for.=C2=A0 My= only confusion is
> the "3" in net =3D GND:3=C2=A0 How does that tie into the ne= t=3D GND:1?

The '3' is the pin number.

A symbol instance in a schematic can have any number of net=3D attributes of the form:

=C2=A0 net=3D=C2=ABNETNAME=C2=BB:=C2=ABPIN=C2=BB

This is typically used for power pins.=C2=A0 I try to avouid that.=C2=A0 I = use
expicit, visible net=3D attributes for grounded mounting holes a lot.

Here we talk about a symbol with pins 1 and 2 where nets are drawn, and
the footprint has an additinal pin 3, where you need to attach a net to.
You can construct a complete netlist in gschem format with pin-less
symbols, with refdes=3D and net=3D attributes attached.

NB, I was wondering about corner cases.=C2=A0 Say, a symbol has atttributes=

=C2=A0net=3DGND:7
=C2=A0net=3DVCC:14

In the schematic I promote one of them, and add a third

=C2=A0net=3DV33:14
=C2=A0net=3DnOE:1

Is there a formal rule that ensures that the net=3DGND:7 in the symbol is accepted, but the net=3DVCC:14 is not?=C2=A0 Or do I need to always promote= all
net=3D attibutes if I attache any to the symbol instance?

Stephan

>
> On Wed, Jul 11, 2018 at 8:55 AM, Rob Butts <r DOT butts2 AT gmail DOT com> wrote:
>
>> Yes, I believe so.
>>
>> On Tue, Jul 10, 2018 at 6:52 PM, John Griessen (john AT ecosensory DOT com) [via
>> geda-us= er AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
>>
>>> On 07/10/2018 05:06 PM, Dave McGuire (mcguire AT neurotica DOT com) [via
>>> ged= a-user AT delorie DOT com] wrote:
>>>
>>>>=C2=A0 =C2=A0In the
>>>> schematic, I use a standard resistor, which has two pins, = 1 and 2.=C2=A0 The
>>>> DPAK PCB footprint has pin 3, which is what gave me troubl= e.
>>>>
>>>
>>>
>>> I say, "There is no on-the-fly way to do that in the GUI.= "=C2=A0 [John folds
>>> arms resolutely]
>>>
>>> "It's handled like DJ said:"
>>>
>>> "treat the exposed pad like any other pin/pad, give it a<= br> >>> pinnumber (make one up) and expose it in the schematic symbol.= "
>>>
>>> Then connect in gschem and output a new netlist, or import fro= m gschem.
>>>
>>> And now Stephan comes up with this!
>>>
>>> "On 07/10/2018 05:33 PM, Stephan B=C3=B6ttcher wrote:
>>> > The footprint has three pins, the schematic symbol only t= wo.=C2=A0 Add a net=3D
>>> > attribute to the symbol instance to tell where the third = pin shall
>>> > connect to
>>> >
>>> >=C2=A0 =C2=A0 net=3DGND:3"
>>>
>>> Sounds like what you were wanting.
>>>
>>>
>>>
>>

--
Stephan

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