Basically, I was able to copy & paste a new parameter block in the file “cq_parameters_tssop.py” and update it with some values from the data sheet.
'TSOP2-54': Params( #
the = 12.0, # body angle in degrees
tb_s = 0.15, # top part of body is that much smaller
c = 0.15, # pin thickness, body center part height
R1 = 0.2, # pin upper corner, inner radius
R2 = 0.2, # pin lower corner, inner radius
S = 0.15, # pin top flat part length (excluding corner arc)
fp_s = True, # True for circular pinmark, False for square pinmark (useful for diodes)
fp_r = 1.2, # first pin indicator radius
fp_d = 0.3, # first pin indicator distance from edge
fp_z = 0.15, # first pin indicator depth
ef = 0, # 0.05, # fillet of edges Note: bigger bytes model with fillet
cc1 = 0.25, #0.45 chamfer of the 1st pin corner
D1 = 22.22, # body length
E1 = 10.16, # body width
E = 11.76, # body overall width E=E1+2*(S+L+c)
A1 = 0.1, # body-board separation
A2 = 1.0, # body height
b = 0.375, # pin width
e = 0.8, # pin (center-to-center) distance
npx = 27, # number of pins along X axis (width)
npy = 0, # number of pins along y axis (length)
epad = None, # e Pad
excluded_pins = None, #no pin excluded
modelName = 'TSOP2-54-MT48LCxxMxA2-P', #modelName
rotation = -90, # rotation if required
dest_dir_prefix = 'TSSOP'
),
However, I didn’t see any .kicad_mod file produced with the 3D model. How can I also generate the footprint?
Sadly there is no script (yet) generating SOIC footprints. But there is one for DIP style packages. It might be possible to modify this to generate the desired footprint(s) (Yes this would be a lot of work for only one footprint but it would still be nice if the SOIC footprints are script generated.)
Script generated footprints are also available for many patterns using QEDA. This will generate IPC Compliant footprints (and a library component too) from some simple parameters
e.g. for a typical 8 pin SOIC you define it in the following terms:
@maui
I downloaded the Footprint Wizard plugin from https://github.com/xesscorp/xess_fp_wizard. To install it, I coped the .py file to C:\Program Files\KiCad\share\kicad\scripting\plugins, per the instructions in the README file.
Hey People im looking for suggestions for a small “math problem” Im working on adding auto options in the parameters for specific packages.
For the pin1 indicator on QFN and QFP I believe a decent looking radius and distance to edge could be found from the package width and length any proposals?
Hi guys
sorry for the incomplete question. Ill try to clarify now
in the image below you can see a screenshot of a scripted QFN model.
the Red line is the “Distance to edge” and the Green line is the “Pin 1 Radius”.
These parameters are (often) not in the datasheet of a package, therefore these are guestimated.
I would like to make an option to have the script gestimate these parameters, so they should simply be decent looking.
does this make sense?
I know alot of people think im overcomplicating things but I do prefer to have the script handle as much unknown as possible
I know it’s a cosmetic feature, but a bad guess can easily look really bad. For this reason it can easily mean I have to regenerate the specific model multiple times to get it right. And with currently like 200 QFN/QFP models there is time to save
i don’t know if it works and looks good - you could try to use the distance from the first pin to the edge.
and check/implement some minimal values. (my guess as minimal is: distance to edge = radius of circle; circle radius >= 0,2mm so it is visible enough)
BTW, thanks to a fix by @SchrodingersGat, the KiCad nightly (from Nov. 7 on at least) is now also able to export a step model of a board that only references the .wrl models (provided that the step models with the same names are present alongside the .wrl model), just like StepUp is able to do it from FreeCad. Before this fix, it was required to reference the step models. I keep being amazed how responsive the KiCad developers are to bug reports.
No I mean how do you assign them to the footprint automatically…
Also it’s about quality not quantity for that kind though how much would it take to make development of kicad a full time job for it’s developers?
Just a side question here:
when I use the stepup tool in free cad to import a PCB there some of the models I actually assigned are always missing as well as the models for the DF13C connector(Also missing in the kicad 3d viewer for the DF13C) no idea how to assign them back to be able to see them in FreeCad,
Also when I try to export the same pcb from kicad it show me this error:
Im working on adding auto options in the parameters for specific packages.
