Overlap error under IC

autodeskguest over 15 years ago

I have manually placed GND vias under the IC, but the DRC can't accept it,

showing Overlap error, like seen in the snapshot. Why?

Regards,

autodeskguest over 15 years ago

"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> escreveu na mensagem
news:hidbj9$uje$1@cheetah.cadsoft.de...
I have manually placed GND vias under the IC, but the DRC can't accept it,
showing Overlap error, like seen in the snapshot. Why?

Regards,

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autodeskguest over 15 years ago

"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> wrote in message
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"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> escreveu na mensagem
news:hidbj9$uje$1@cheetah.cadsoft.de...
I have manually placed GND vias under the IC, but the DRC can't accept it,
showing Overlap error, like seen in the snapshot. Why?

Overlap means that the net name of the via and the pad is not the same.
Check the names of both. Placing a via there does not name it automatically.
Click/write name, then click the vias to check their name.
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autodeskguest over 15 years ago

"Morten Leikvoll" <mleikvol@yahoo.nospam> escreveu na mensagem
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"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> wrote in message
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"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> escreveu na mensagem
news:hidbj9$uje$1@cheetah.cadsoft.de...
I have manually placed GND vias under the IC, but the DRC can't accept
it,
showing Overlap error, like seen in the snapshot. Why?

Overlap means that the net name of the via and the pad is not the same.
Check the names of both. Placing a via there does not name it
automatically. Click/write name, then click the vias to check their name.

Actually, the big square under the IC has no name, nor it is connected to
GND... I manually connected it using the VIAS. So I can leave it like this,
that will work, right?
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esilviu over 15 years ago

"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> wrote in message
news:hifi5f$pa5$1@cheetah.cadsoft.de...

Actually, the big square under the IC has no name, nor it is connected to
GND... I manually connected it using the VIAS. So I can leave it like
this, that will work, right?

It will work only if VIAS's name is GND (or whatever name is your gnd
signal).
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autodeskguest over 15 years ago

"eSilviu" <silviu.epure@ugal.ro> escreveu na mensagem
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"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> wrote in message
news:hifi5f$pa5$1@cheetah.cadsoft.de...

Actually, the big square under the IC has no name, nor it is connected to
GND... I manually connected it using the VIAS. So I can leave it like
this, that will work, right?

It will work only if VIAS's name is GND (or whatever name is your gnd
signal).
Yes, they are. I named them to connect to the GND planes. So I'll just
ignore the DRC error.
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autodeskguest over 15 years ago

"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> wrote in message
news:hifi5f$pa5$1@cheetah.cadsoft.de...
Actually, the big square under the IC has no name, nor it is connected to
GND... I manually connected it using the VIAS. So I can leave it like
this, that will work, right?

No that will not work, cause the SMD pad will get a signal name wether you
set it or not.
You should edit your device so that the smd will get a pin that you can
connect to GND. It could be a separate symbol with the pin direction set to
'power' and named 'GND' (and set add feature of this symbol to suiteable
value - rtfm). This will hide the gnd connection, although personally I
don't like hidden stuff.
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autodeskguest over 15 years ago in reply to autodeskguest

"Morten Leikvoll" <mleikvol@yahoo.nospam> escreveu na mensagem
news:hiho1u$3mk$1@cheetah.cadsoft.de...
"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> wrote in message
news:hifi5f$pa5$1@cheetah.cadsoft.de...
Actually, the big square under the IC has no name, nor it is connected to
GND... I manually connected it using the VIAS. So I can leave it like
this, that will work, right?

No that will not work, cause the SMD pad will get a signal name wether you
set it or not.
You should edit your device so that the smd will get a pin that you can
connect to GND. It could be a separate symbol with the pin direction set
to 'power' and named 'GND' (and set add feature of this symbol to
suiteable value - rtfm). This will hide the gnd connection, although
personally I don't like hidden stuff.

I still don't understand that error... there is this ESD diode, with 3
terminals (two of them connected to GND in schematic). I want to put vias on
these pads directly to GND, but it keeps generating overlap error. But if I
create a via name GND on the side of the diode, it connects the pad to the
via... what is wrong?
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autodeskguest over 15 years ago in reply to autodeskguest

"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> wrote in message
news:hjn6vb$cqv$1@cheetah.cadsoft.de...
I still don't understand that error... there is this ESD diode, with 3
terminals (two of them connected to GND in schematic). I want to put vias
on these pads directly to GND, but it keeps generating overlap error. But
if I create a via name GND on the side of the diode, it connects the pad
to the via... what is wrong?

If you put vias ON smd pads, then you will always get drc error. I have been
into the same problem when using a pcb battery holder where I wanted the smd
to be the tallest point on the board, where I wanted the via inside the pad.
I guess there is no other solution than to just approve that error.
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autodeskguest over 15 years ago

"Morten Leikvoll" <mleikvol@yahoo.nospam> escreveu na mensagem
news:hjotkt$9je$1@cheetah.cadsoft.de...

"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> wrote in message
news:hjn6vb$cqv$1@cheetah.cadsoft.de...
I still don't understand that error... there is this ESD diode, with 3
terminals (two of them connected to GND in schematic). I want to put vias
on these pads directly to GND, but it keeps generating overlap error. But
if I create a via name GND on the side of the diode, it connects the pad
to the via... what is wrong?

If you put vias ON smd pads, then you will always get drc error. I have
been into the same problem when using a pcb battery holder where I wanted
the smd to be the tallest point on the board, where I wanted the via
inside the pad. I guess there is no other solution than to just approve
that error.

But will it work? I mean, will connect the pad to GND plane?
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Richard_H over 15 years ago

Morten Leikvoll schrieb:
"Thiago Henrique Rodrigues" <thiago_hr@yahoo.com.br> wrote in message
news:hjn6vb$cqv$1@cheetah.cadsoft.de...
I still don't understand that error... there is this ESD diode, with 3
terminals (two of them connected to GND in schematic). I want to put vias
on these pads directly to GND, but it keeps generating overlap error. But
if I create a via name GND on the side of the diode, it connects the pad
to the via... what is wrong?

If you put vias ON smd pads, then you will always get drc error.

You won't get an error, if you change the Design Rules.
Go to the Clearance tab and set the value for Same signals
for SMD - Via to 0.

--
Mit freundlichen Gruessen / Best regards
Richard Hammerl
CadSoft Support -- hotline@cadsoft.de
FAQ: http://www.cadsoft.de/faq.htm
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