Mail Archives: geda-user/2018/07/11/10:12:20
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I have a circuit board with a L6474 stepper motor driver.
Nicklas, I don't see a difference between the L6470 and the L6474 (aside
from price). 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> wr=
ote:
>
>> "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. My only
>> confusion is
>> > the "3" in net =3D GND:3 How does that tie into the net=3D GND:1?
>>
>> The '3' is the pin number.
>>
>> A symbol instance in a schematic can have any number of net=3D attribute=
s
>> of the form:
>>
>> net=3D=C2=ABNETNAME=C2=BB:=C2=ABPIN=C2=BB
>>
>> This is typically used for power pins. I try to avouid that. 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. Say, a symbol has atttributes
>>
>> net=3DGND:7
>> net=3DVCC:14
>>
>> In the schematic I promote one of them, and add a third
>>
>> net=3DV33:14
>> net=3DnOE:1
>>
>> Is there a formal rule that ensures that the net=3DGND:7 in the symbol i=
s
>> accepted, but the net=3DVCC:14 is not? Or do I need to always promote a=
ll
>> 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-user 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
>> >>> geda-user AT delorie DOT com] wrote:
>> >>>
>> >>>> In the
>> >>>> schematic, I use a standard resistor, which has two pins, 1 and 2.
>> The
>> >>>> DPAK PCB footprint has pin 3, which is what gave me trouble.
>> >>>>
>> >>>
>> >>>
>> >>> I say, "There is no on-the-fly way to do that in the GUI." [John
>> folds
>> >>> arms resolutely]
>> >>>
>> >>> "It's handled like DJ said:"
>> >>>
>> >>> "treat the exposed pad like any other pin/pad, give it a
>> >>> pinnumber (make one up) and expose it in the schematic symbol."
>> >>>
>> >>> Then connect in gschem and output a new netlist, or import from
>> 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 two. Add =
a
>> net=3D
>> >>> > attribute to the symbol instance to tell where the third pin shall
>> >>> > connect to
>> >>> >
>> >>> > net=3DGND:3"
>> >>>
>> >>> Sounds like what you were wanting.
>> >>>
>> >>>
>> >>>
>> >>
>>
>> --
>> Stephan
>>
>>
>
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<div dir=3D"ltr">
<span style=3D"font-size:12.8px;text-decoration-style:initial;text-decorati=
on-color:initial;float:none;display:inline">I have a circuit board with a L=
6474 stepper motor driver.<span>=C2=A0</span></span>
<div><span style=3D"font-size:12.8px;text-decoration-style:initial;text-dec=
oration-color:initial;float:none;display:inline"><span><br></span></span></=
div><div><span style=3D"font-size:12.8px;text-decoration-style:initial;text=
-decoration-color:initial;float:none;display:inline"><span>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?</span></span></div></div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Jul 11, 2018 at 10:=
06 AM, Rob Butts <span dir=3D"ltr"><<a href=3D"mailto:r DOT butts2 AT gmail DOT com=
" target=3D"_blank">r DOT butts2 AT gmail DOT com</a>></span> wrote:<br><blockquote=
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex"><div dir=3D"ltr">Thanks, now I understand the pi number=
after the net name.</div><div class=3D"HOEnZb"><div class=3D"h5"><div clas=
s=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Jul 11, 2018 at 9:=
39 AM, Stephan B=C3=B6ttcher <span dir=3D"ltr"><<a href=3D"mailto:geda AT p=
sjt.org" target=3D"_blank">geda AT psjt DOT org</a>></span> wrote:<br><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex"><span>"Rob Butts (<a href=3D"mailto:r DOT butts2 AT gma=
il.com" target=3D"_blank">r DOT butts2 AT gmail DOT com</a>) [via <a href=3D"mailto:ge=
da-user AT delorie DOT com" target=3D"_blank">geda-user AT delorie DOT com</a>]"<br>
</span><span><<a href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank"=
>geda-user AT delorie DOT com</a>> writes:<br>
<br>
> I believe Stephan's solution is what I'm looking for.=C2=A0 My=
only confusion is<br>
> the "3" in net =3D GND:3=C2=A0 How does that tie into the ne=
t=3D GND:1?<br>
<br>
</span>The '3' is the pin number.<br>
<br>
A symbol instance in a schematic can have any number of net=3D attributes<b=
r>
of the form:<br>
<br>
=C2=A0 net=3D=C2=ABNETNAME=C2=BB:=C2=ABPIN=C2=BB<br>
<br>
This is typically used for power pins.=C2=A0 I try to avouid that.=C2=A0 I =
use<br>
expicit, visible net=3D attributes for grounded mounting holes a lot.<br>
<br>
Here we talk about a symbol with pins 1 and 2 where nets are drawn, and<br>
the footprint has an additinal pin 3, where you need to attach a net to.<br=
>
<br>
You can construct a complete netlist in gschem format with pin-less<br>
symbols, with refdes=3D and net=3D attributes attached.<br>
<br>
NB, I was wondering about corner cases.=C2=A0 Say, a symbol has atttributes=
<br>
<br>
=C2=A0net=3DGND:7<br>
=C2=A0net=3DVCC:14<br>
<br>
In the schematic I promote one of them, and add a third<br>
<br>
=C2=A0net=3DV33:14<br>
=C2=A0net=3DnOE:1<br>
<br>
Is there a formal rule that ensures that the net=3DGND:7 in the symbol is<b=
r>
accepted, but the net=3DVCC:14 is not?=C2=A0 Or do I need to always promote=
all<br>
net=3D attibutes if I attache any to the symbol instance?<br>
<br>
Stephan<br>
<div class=3D"m_-9193569647001910475HOEnZb"><div class=3D"m_-91935696470019=
10475h5"><br>
><br>
> On Wed, Jul 11, 2018 at 8:55 AM, Rob Butts <<a href=3D"mailto:r.but=
ts2 AT gmail DOT com" target=3D"_blank">r DOT butts2 AT gmail DOT com</a>> wrote:<br>
><br>
>> Yes, I believe so.<br>
>><br>
>> On Tue, Jul 10, 2018 at 6:52 PM, John Griessen (<a href=3D"mailto:=
john AT ecosensory DOT com" target=3D"_blank">john AT ecosensory DOT com</a>) [via<br>
>> <a href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">geda-us=
er AT delorie DOT com</a>] <<a href=3D"mailto:geda-user AT delorie DOT com" target=3D"=
_blank">geda-user AT delorie DOT com</a>> wrote:<br>
>><br>
>>> On 07/10/2018 05:06 PM, Dave McGuire (<a href=3D"mailto:mcguir=
e AT neurotica DOT com" target=3D"_blank">mcguire AT neurotica DOT com</a>) [via<br>
>>> <a href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">ged=
a-user AT delorie DOT com</a>] wrote:<br>
>>><br>
>>>>=C2=A0 =C2=A0In the<br>
>>>> schematic, I use a standard resistor, which has two pins, =
1 and 2.=C2=A0 The<br>
>>>> DPAK PCB footprint has pin 3, which is what gave me troubl=
e.<br>
>>>><br>
>>><br>
>>><br>
>>> I say, "There is no on-the-fly way to do that in the GUI.=
"=C2=A0 [John folds<br>
>>> arms resolutely]<br>
>>><br>
>>> "It's handled like DJ said:"<br>
>>><br>
>>> "treat the exposed pad like any other pin/pad, give it a<=
br>
>>> pinnumber (make one up) and expose it in the schematic symbol.=
"<br>
>>><br>
>>> Then connect in gschem and output a new netlist, or import fro=
m gschem.<br>
>>><br>
>>> And now Stephan comes up with this!<br>
>>><br>
>>> "On 07/10/2018 05:33 PM, Stephan B=C3=B6ttcher wrote:<br>
>>> > The footprint has three pins, the schematic symbol only t=
wo.=C2=A0 Add a net=3D<br>
>>> > attribute to the symbol instance to tell where the third =
pin shall<br>
>>> > connect to<br>
>>> ><br>
>>> >=C2=A0 =C2=A0 net=3DGND:3"<br>
>>><br>
>>> Sounds like what you were wanting.<br>
>>><br>
>>><br>
>>><br>
>><br>
<br>
</div></div><span class=3D"m_-9193569647001910475HOEnZb"><font color=3D"#88=
8888">-- <br>
Stephan<br>
<br>
</font></span></blockquote></div><br></div>
</div></div></blockquote></div><br></div>
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