Multiple(non standart) footprints

On 05/25/2012 03:10 PM, Nifril wrote:

Good Day.

I have a two questions:

1) I want to put several different footprints on the PCB for one part on the scheme.  For example ATmega32U4 in QFN/TQFP package or a trimmer in vertical/horizontal package.

How can I do this?

I have done the same thing on several occasions.  Once you have your

part established with the desired footprints in the library, you need to

add the part to the schematic twice - once for each footprint.  You can

place both symbols directly on top of each other do that all connections

will be identical.  I smash the symbol and move each reference (U1, U2,

or R1, R2) so they don't overlap.  I then add a note to the schematic

that only one of the two parts will be populated.

 

2) In my scheme I have a  transistor which I need put on the big heat sink. Transistor will be connected  to the connector on PCB.

How can I add a part on the scheme but hide them on the PCB?

There are a couple of ways to approach this determined by whether or not

you want to show the connector in the schematic for BOM purposes or not.

If you want to show the connector, the add the connector as expected in

your schematic.  In your library create a device that has just the

symbol of the transistor - no packages defined.  Then add that device to

your schematic.

In the case where you do not want to show the connector, you can create

a variant of the transistor device that has the connector's footprint,

then add that device/package to your schematic.

HTH,

    - Chuck

On 05/25/2012 03:10 PM, Nifril wrote:

Good Day.

I have a two questions:

1) I want to put several different footprints on the PCB for one part on the scheme.  For example ATmega32U4 in QFN/TQFP package or a trimmer in vertical/horizontal package.

How can I do this?

I have done the same thing on several occasions.  Once you have your

part established with the desired footprints in the library, you need to

add the part to the schematic twice - once for each footprint.  You can

place both symbols directly on top of each other do that all connections

will be identical.  I smash the symbol and move each reference (U1, U2,

or R1, R2) so they don't overlap.  I then add a note to the schematic

that only one of the two parts will be populated.

 

2) In my scheme I have a  transistor which I need put on the big heat sink. Transistor will be connected  to the connector on PCB.

How can I add a part on the scheme but hide them on the PCB?

There are a couple of ways to approach this determined by whether or not

you want to show the connector in the schematic for BOM purposes or not.

If you want to show the connector, the add the connector as expected in

your schematic.  In your library create a device that has just the

symbol of the transistor - no packages defined.  Then add that device to

your schematic.

In the case where you do not want to show the connector, you can create

a variant of the transistor device that has the connector's footprint,

then add that device/package to your schematic.

HTH,

    - Chuck