Determining pin pitch for existing library parts

On 7/31/2012 5:54 AM, Krycek wrote:

I am very new to Eagle so still finding my way around it. One thing that currently has me confused is how to determine the pin pitch for a footprint thats in the library.

 

In this case I am using an F25HP package from the con-subd.lbr on a simple parallel breakout PCB im laying out but for the life of me I can't see a way either in the PCB layout or the library editor itself to determine the pin pitch that has been used for this package.

 

Any help would be appreciated as I can see me running into similar problems with other library packages that aren't on a standard 0.1" pitch.

 

You could...

1.  Adjust the grid settings (Turn it on if its not visible) to

something on the order of what you expect for the pin pitch then eyeball

it to get a rough idea.

2.  Open the library with the library editor,  pick the info command

tool, and select one of the holes/pads.   The info dialog will show you

the exact position of the hole/pad.    Note the coordinates and then

select an adjacent hole/pad.   Subtract the coordinates to get the pitch.

3.  Use the Mark tool to set a marker at one pin/pad.   After you set

the marker there should be a relative coordinate readout in the upper

left part of the window frame/tool bars.   The Relative coordinate will

be in the units of the current grid and will show you how far the mouse

pointer/cursor is from the marker.    You way want to hold down the Alt

key to use the alt grid for fine positioning.

Regards,

Jim

Seems like a lot of trouble to know the pitch of a component? Why not have this information available in a description of the part. Any part should have pad size, pitch and all other relevent information in a pop-up on request. After all if the part exists, the info exists.

One other thing, even if the part description mentions the pitch and other package information, there could be a mistake. I always measure pitch and pad sizes just to be sure. Most times the only way to be sure you get what you need is to make the part layout yourself.

Regards,

Bob Moreno

On 7/31/2012 9:33 AM, Bob Moreno wrote:

Seems like a lot of trouble to know the pitch of a component? Why not have this information available in a description of the part. Any part should have pad size, pitch and all other relevent information in a pop-up on request. After all if the part exists, the info exists.

 

Hi Bob,

The truth is that not everyone who makes libraries has the presence of

mind to include such information. I wrote a small standard for library

creation to try to elevate the overall quality of user submitted libraries.

One of the recommendations is to include a link to the datasheet or some

other documentation which can provide the finer details of a part.

You can find it under the Documentation section of:

www.cadsoftusa.com/downloads

hth,

Jorge Garcia

Hi Jorge, I saw and read your write-up, very helpful, thanks.

Regards,

Bob Moreno

Hi Jorge, I saw and read your write-up, very helpful, thanks.

Regards,

Bob Moreno