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Autodesk EAGLE
EAGLE User Support (English) Creating a library with the help of SMD,   PAD, and another commands
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Related

Creating a library with the help of SMD,   PAD, and another commands

autodeskguest
autodeskguest over 15 years ago

Hi people, i am new here.

 

I want to create a library for the TI tlc5927. It has a lot of connections,

so I decided to learn to use the command line: SMD, PAD, etc.

 

I explain step by step what I've done.

 

Component's datasheet:

http://focus.ti.com/docs/prod/folders/print/tlc5927.html

 

STEP 1: Read the datasheet and look for the information about the pins,

measures, recommended footprint, etc. I have marked in red the information

that I use.

 

 

What I need are the dimmensions of the pads and the big thermal pad (in

red).

 

STEP 2: Calculate the relative positions of every pad referring to the

origin (blue cross in the picture). I use a excel sheet to calculate easily

the position of every pad, like:

 

 

STEP 3: With this Information I prepare a file .scr that will create the

footprint automatically.

 

Quote:

  1. Thermal pad

SMD 7.8 3.4 (3.9 0);

 

  1. Upper row

SMD 0.44 1.74 (0.325 -2.8) (0.975 -2.8) (1.625 -2.8) (2.275 -2.8)

(2.925 -2.8) (3.575 -2.8) (4.225 -2.8) (4.875 -2.8) (5.525 -2.8) (6.175

-2.8) (6.825 -2.8) (7.475 -2.8);

 

  1. Lower row

SMD 0.44 1.74 (0.325 2.8) (0.975 2.8) (1.625 2.8) (2.275 2.8) (2.925

2.8) (3.575 2.8) (4.225 2.8) (4.875 2.8) (5.525 2.8) (6.175 2.8) (6.825

2.8) (7.475 2.8);

 

  1. Silkscreen

LAYER tPlace;

WIRE (0 -2.25) (7.90 -2.25) (7.90 2.25) (0 2.25) (0 -2.25);

 

 

STEP 4: I run the file .scr and y then I have the next footprint:

 

 

 

There are a couple of things that I still have to solve:

 

- How do I change the solder mask for the thermal pad? According to the

datasheet, I should let a small "windows" as shown in the first picture.

 

- The vias are still pending.

 

Thanks in advance!

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

 

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  • autodeskguest
    autodeskguest over 15 years ago

    humano schrieb:

     

    Hi people, i am new here.

     

    Welcome. image

     

    - How do I change the solder mask for the thermal pad? According to the

    datasheet, I should let a small "windows" as shown in the first picture.

     

    Assuming you are referring to the solder paste, not the stop mask: turn

    the automatic paste mask off for the thermal pad (either with CHANGE, or

    by using INFO and editing the properties), and draw the desired

    rectangle manually in the tCream layer.

     

    - The vias are still pending.

     

    Do not put vias in packages within libraries. Put them in the board

    instead. Otherwise, you'll get tons of DRC complaints since you can't

    assign a signal name to the vias within a package.

     

    Tilmann

     

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  • autodeskguest
    autodeskguest over 15 years ago

    humano schrieb:

     

    Hi people, i am new here.

     

    Welcome. image

     

    - How do I change the solder mask for the thermal pad? According to the

    datasheet, I should let a small "windows" as shown in the first picture.

     

    Assuming you are referring to the solder paste, not the stop mask: turn

    the automatic paste mask off for the thermal pad (either with CHANGE, or

    by using INFO and editing the properties), and draw the desired

    rectangle manually in the tCream layer.

     

    - The vias are still pending.

     

    Do not put vias in packages within libraries. Put them in the board

    instead. Otherwise, you'll get tons of DRC complaints since you can't

    assign a signal name to the vias within a package.

     

    Tilmann

     

    • Cancel
    • Vote Up 0 Vote Down
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