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Package variants with different number of pins

Former Member

 

I'm creating a library object for the Atmel ATmega644. This chip is

available in PDIP and TQLP packages. The PDIV vesion has 40 pins, the

TQLP version has 44 pins. The additional pins of the TQLP version are

used for additional Vcc and Gnd connections.

 

How can I have one 'device', using one 'symbol' for both packages ?

I'd like to connect 1 'symbol' pin to multiple 'package' pins.

 

It looks like I get either a good PDIP variant and a TQFP with some pins

not connected or if the symbol has multiple Gnd/Vcc pins the TQFP is

fine and the PDIP has warnings about the unconnected pins.

 

Markus

 

  • Markus Baertschi wrote:

    I'm creating a library object for the Atmel ATmega644. This chip is

    available in PDIP and TQLP packages. The PDIV vesion has 40 pins, the

    TQLP version has 44 pins. The additional pins of the TQLP version are

    used for additional Vcc and Gnd connections.

     

    How can I have one 'device', using one 'symbol' for both packages ?

    I'd like to connect 1 'symbol' pin to multiple 'package' pins.

     

    It looks like I get either a good PDIP variant and a TQFP with some

    pins not connected or if the symbol has multiple Gnd/Vcc pins the

    TQFP is fine and the PDIP has warnings about the unconnected pins.

     

    Markus

     

    I'm afraid you can't get there from here -- you will have to make 2 separate

    devices.  I know it doesn't seem very elegant, so you may have to grit your

    teeth a bit.

     

    If you use a separate symbol for the supply pins, then the symbol for the

    rest of the device can be the same for both devices.

     

    --

    Bert Menkveld

     

     

     

  • Markus Baertschi schrieb:

     

    I'm creating a library object for the Atmel ATmega644. This chip is

    available in PDIP and TQLP packages. The PDIV vesion has 40 pins, the

    TQLP version has 44 pins. The additional pins of the TQLP version are

    used for additional Vcc and Gnd connections.

     

    How can I have one 'device', using one 'symbol' for both packages ?

    I'd like to connect 1 'symbol' pin to multiple 'package' pins.

     

    It looks like I get either a good PDIP variant and a TQFP with some pins

    not connected or if the symbol has multiple Gnd/Vcc pins the TQFP is

    fine and the PDIP has warnings about the unconnected pins.

     

    Markus

     

     

    Sorry, but it is not possible to have 1 pin tied to more than 1

    pads. You have to define two different devices.

     

     

    --

    Mit freundlichen Gruessen / Best regards

    Richard Hammerl

      CadSoft Support -- hotline@cadsoft.de

      FAQ: http://www.cadsoft.de/faq.htm