PCB board for Chip testing

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

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