I can't test it now, but IIRC it is (was) possible to create a symbol with multiple pins tied to the same net. Just create a device with 2 pins and assign it the footprint you need.

Diego

Il dom 22 set 2024, 08:49 Bernd Wiebus via <bernd.wiebus=[email protected]> ha scritto:

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Hello Pierre-Raymond

for
> example 0-Ohm resistor with a power Input connected to gnd power line
> and a power output with a power flag connected to the Gnd pin of the
> IC.

If your 0-Ohm resistor connects direct to a power flag, then there is
perhaps no need for a power output, power input. You can use just
"passive". The Type has to fit only with the rest of the net.

> Shouldn't there be a net name conflict with the IC gnd and the
> resistor's output ?

Name is not always an issue, because the net cut in half with the 0-Ohm
resistor will get a new name at last in one of the halfs.

There are rules for naming the nets, despite i do not know them. This
rules will make automatical new names. But of course, if you tie a
label to the net, then there you will get a conflict.

KiCad will keep the net name like the label name in the section tied to
the label, and the other part will get automatic a new name. you have
to tie a new label to this part, if you want a distinctive label, and
of course, there will be a name conflict with the existing label. (for
global labels, the indirect connection between global labels would try
to bypass your 0-Ohm resistor at the board)
So you have to choose a new one.

> And, with a fuse and the same rationale, wouldn't
> the ERC cry a bit ?

Practically i use "3V3" as label for the power rail to the ics, and
"3V3_Feeding" for the 3,3V rail between the power plug and the fuse,
as an example.
For a 0-Ohm resistor, you could perhaps name after the devices
connected. As an Example "3V_IC1-2-5" and "3V3_IC4" with the 0-Ohm
Resistor connecting "3V_IC1-2-5" and "3V3_IC4".

This is also the way this is handled in altium. Perhaps only older
Versions, i do not know exactly.

A similar problem like at fuses and 0-Ohm resistors occures at net-ties,
which are special designed with two (or more) pins/pads which are tied
to different named/labeled nets. This is a way to keep analog gnd and
digital gnd away eatch other conected only in one point and avoiding
connecting them at wrong places by autorouter or even copper pour.


With best regards: Bernd Wiebus alias dl1eic


Am Sat, 21 Sep 2024 21:46:26 +0200
schrieb "Pierre-Raymond Rondelle via "
<pierreraymondrondelle=[email protected]>:

> Bernd, Thank you to point this aspect. I didn't even think to the
> fuse. I save your message it will probably be helpful in the future.
>
> Just one question (it makes a while I didn't design a board) : for
> example 0-Ohm resistor with a power Input connected to gnd power line
> and a power output with a power flag connected to the Gnd pin of the
> IC. Shouldn't there be a net name conflict with the IC gnd and the
> resistor's output ? And, with a fuse and the same rationale, wouldn't
> the ERC cry a bit ? Regards
>
> On 21.09.24 21:05, Bernd Wiebus via wrote:
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> >
> > Hello Pierre-Raymond
> >
> > Mandatory for power lines.
> >>
> > Same Problem as for fuses. It is not the problem, that you use two
> > nets (numbers will be enough) but for the ERC-Testing, because you
> > end a power line, and the other end of the device is no power line.
> > So the ERC-Test will throw errormessages.
> >
> > Cure for this seems for zero ohm resistors the same as for fuses:
> > Define one pin as power input, so you can connect it to a symbol
> > with power flag, and the outher as power output, so you can
> > connect it to passive pins. Then the ERC will be satisfied.
> >
> > Of course, as for small designs, you can easyly ignore the error
> > messages, as far as you not get confused with real errors.
> >
> > Be aware, there sometimes is a confusion with names. The pin, where
> > the fuse or zero ohm resistor is tied to a pin with power flag
> >
> > Other aspect: Keeping the zero ohm resistor in the schematic will
> > make the DRC at the board run smooth. And if you forgot the resistor
> > accidentially, you will got an error message. :O)
> >
> > With best regards: Bernd Wiebus alias dl1eic
> >
> >
> >
> > Am Sat, 21 Sep 2024 19:14:54 +0200
> > schrieb "Pierre-Raymond Rondelle via "
> > <pierreraymondrondelle=[email protected]>:
> >
> > John, Robert,
> >>
> >> Zero Ohms resistors have the drawback to create two nets.
> >>
> >> I had similar issue some years ago with Kicad 5.20, it didn't have
> >> any practical solution for that. So, I cheated, creating symbol and
> >> models for keeping the same net name on both sides of the jumper.
> >> Mandatory for power lines. My computer being too old, I didn't
> >> migrate to newer kicad versions. Consequently, didn't test the
> >> trick on post 5.20. But since you're asking the jumper question I
> >> assume that this hasn't been solved.
> >>
> >> Instead, I made a specific component using 3 pads with the same net
> >> name, whichever the pad number is. In the middle a square one (thin
> >> and long, this is the "jumper wire"), of course not drilled and two
> >> round ones at the ends. The 3 pads were? overlapping, establishing
> >> a connection in between the ends.
> >>
> >> For the schematics,I created a dedicated symbol with one terminal,
> >> (I named it "lnk"), and filled the attribute table for the BOM. I
> >> placed it on a convenient place on the net the jumper is
> >> installed, I numbered it. That's all.
> >>
> >> Refer to the annexed files. Remember it's ver 5.20. You may have to
> >> modify it regarding the new version rules. My application was to
> >> route a number of different single side PCBs where power lines were
> >> routed on component side via jumper wires. Refer to: "Strap
> >> footprint.png" & "Strap footprints in use.png" In schema, the
> >> symbol was: "Strap symbol for eeschema.png", represented by "Strap
> >> Symbols attached to the drawing.png" in the electrical drawing.
> >> "My_Straps.pretty.rar" is the strap library model for 3.81 to 22.86
> >> mm long jumpers. And for the PCB I also provide an example
> >> "strap_test.rar" (not functional, for decorating your bedroom only
> >> ! ). Have fun
> >>
> >>
> >>
> >> On 20.09.24 18:49, Tony Casey via wrote:
> >> If you want to use headers and links, I have schematic symbols for
> >> those. Perhaps KiCad even has them in one of its extensive
> >> library, I don't know.
> >>
> >>> Alternatively, use zero Ohm resistors, and add a text note to say
> >>> what they are for. Do that, as well for links. If they are
> >>> multiple position links, add a truth table.
> >>>
> >>> I try to put everything on the schematic. That way, nothing gets
> >>> missed.
> >>>
> >>> --
> >>> Regards,
> >>> Tony?
> >>>
> >>> On 20 Sep 2024 17:17, John Woodgate <jmw@...> wrote:
> >>>
> >>> Thanks, Robert. I suppose they have to be placed in the schematic
> >>>> exactly where they are needed in the layout, which can make the
> >>>> schematic look very odd. On 2024-09-20 16:35, Robert via
> >>>> wrote: They are normally in the schematic as zero ohm
> >>>> resistors. In the
> >>>> layout they can be whatever you like, eg pukkka zero ohm
> >>>> resistors
> >>>>> (wire-ended or surface mount), hand-cut wire links, blobs of
> >>>>> solder, etc.
> >>>>>
> >>>>> Regards,
> >>>>>
> >>>>> Robert
> >>>>>
> >>>>> * Plain text email - safe, readable, inclusive. *
> >>>>>
> >>>>>
> >>>>> --
> >>>>> This email has been checked for viruses by Avast antivirus
> >>>>> software.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> --
> >>>>> OOO - Own Opinions Only
> >>>> Best Wishes
> >>>> John Woodgate
> >>>> Keep trying
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>
> >>
> >>
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