-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hello Diego 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. Yes, of course. A symbol with multiple Pins connected to the same net. Thats easy. But a symbol whose pins are tied to one another and DIFFERENT other Nets without getting the autorouter or copper fill making unwanted connections. Think about analog and digital Signals on one board. The grounds of those analog and digital Signals schould be connected at only one point, and all other connections should be avoided for EMC reasons. And ERC and DRC should be done ok and smooth. with best regards: Bernd Wiebus alias dl1eic Am Sun, 22 Sep 2024 09:51:18 +0200 schrieb "NdK via groups.io" <ndk.clanbo@...>: 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 groups.io <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 groups.io"
<pierreraymondrondelle@...>:
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 groups.io 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 groups.io"
<pierreraymondrondelle@...>:
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 groups.io 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
groups.io 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
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John Woodgate
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