Stats

Locked Locked
Replies 5
Subscribers 164
Views 15549
Members are here 0

Grounding mounting holes

I have a board that I currently have two mounting holes on. The engineer wants to add two more and tie them to ground. Is there a way to do this on the PCB? Thanks

Sandy

Originally posted in cdnusers.org by MURPHYS

archive over 17 years ago

Ideally you should add them in the circuit / netlist and forward annotate them into the design.

Allegro does have the option to add / modify parts and nets on the fly using Logic -> Part Logic and Logic -> Net Logic.

KP

Originally posted in cdnusers.org by kp
Cancel
Vote Up 0 Vote Down

Cancel
archive over 17 years ago

If I added them on the fly would there be any issues forward and back annotating? I know Pads didn't like it when you did that and Orcad would strip the connections out.

Sandy

Originally posted in cdnusers.org by MURPHYS
Cancel
Vote Up 0 Vote Down

Cancel
archive over 17 years ago

You could also create the padstack with mounting hole requirements and add the hole as a large via.

Originally posted in cdnusers.org by Trykon
Cancel
Vote Up 0 Vote Down

Cancel
archive over 17 years ago

I do not tend to use "on the fly" I would think that this could cause issues. If you do not wish to change the front end logic it is probably better to make them as Trykon suggests and use a large via.

Originally posted in cdnusers.org by kp
Cancel
Vote Up 0 Vote Down

Cancel
archive over 17 years ago

Hah! Mounting holes and GND...

Got mounting holes? Copper surrounding pads top/bottom? Pull some copper off the pads and tie them to GND. 3-4 spokes should do, and use good size (>.02") GND vias.

Good day,
Mitch

Originally posted in cdnusers.org by cadpro2k
Cancel
Vote Up 0 Vote Down

Cancel

Cadence Guidelines

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.