PCB board for Chip testing

You probably need to follow the tutorial, there is a very good user guide. Once you've done that, you'll

have a much clearer idea of how to proceed.

Regarding pad sizes, you should follow the guidelines in the manufacturer datasheets. They are optimal.

Regarding colors, they are a little meaningless because they can change depending on user preferences.

You can refer to this layers reference to get an idea of the concept of layers in EAGLE (I wrote it a while back to

help myself remember, but you may find it useful).

By default, green is usually for through-hole components, known as Pads in Eagle terminology, or for vias.

The red is usually used to define the copper for surface mount devices.

You'll see some examples in that doc.

Basically, the connection mapping between the logical schematic symbol and the physical landing pattern is achieved by

clicking on the button shown at the top of this picture. It allows you then to add the symbol, etc. Important parts are highlighted here.

Clicking 'Connect' allows you to perform the mapping.

Thank you for answering, i will try to find some useful info on that guide

On 05/02/13 17:31, Pedro Moreira wrote:

After drawing the symbol i made the package and my teacher told me that the pads should be at a distance of 0.1 mm from each other so i used very tiny pads.

Are you sure he said that? 0.1mm is VERY fine pitch! On the other hand

0.1 INCH is a standard that's been around for donkey's years.

Am 05.02.2013 18:31, 10schrieb Pedro Moreira:

Hello, I'm starting to work with EAGLE software because i have a project that i have to develop for my university.

 

I have to make a PCB board that will be used to test 4 chips. Each one of this chips has 4 comparators.

 

So my teacher told me to start by creating a part on EAGLE that represents the chip. I created this part in a .lbr file with 12 pins: CLK1, CLK2, CLK3, CLK4, VO1, VO2, VO3, VO4, VDD, VSS, VINP, VINN.

 

When i'm making the symbol, after having the 12 pins, which button should i use for wiring the pins to each other? "Wire" or "Polygon" ?

 

After drawing the symbol i made the package and my teacher told me that the pads should be at a distance of 0.1 mm from each other so i used very tiny pads.

The problem is that if i use a normal resistor with the chip that i just made it looks ridiculous because the resistor if so much bigger. And besides that i don't know which type of pads i should use? The green ones or the red?

Can i change the size of a resistor on eagle?

 

I've attached the library with the chip symbol that i made so that somebody can help me by seeing that mistakes that i possibly did.

 

Thank you

 

The easiest thing would be to open i.e. the maxim library and view the

the MAX901 or the MAX910 as an example to see how libraries are made.

You can even copy those devices (or others) into YOUR OWN library as a base.

Usually in the symbol one NAMEs the pins according the datasheet and

also gives them a DIRECTION, because not all pins are I/O's like you did.

The package contains the pads with the NUMBERS.

In the device editor you connect the pin NAMES wit the pad NUMBERS.

Give the device a prefix like "IC".

Check also VISIBLE in the symbol editor, how every pin is shown later in

the device. Also >NAME / >VALUE is used in package and symbol in the

correct layers. Orientate yourself on other libraries and check the

tutorial in  the eagle doc directory.

--

Mit freundlichen Grüßen / With best regards

Joern Paschedag

red pad's , yes you can the size that I know of

I need to thank all of you for the responses. I found out that a friend of mine is used to work with EAGLE so he is helping me.