The
SMD Summary action is intended to operate on external copper layers and produce
statistical reports on SMD lands and packages in the inspected layers. The SMD
pitch and pad size parameters, as well as the types and numbers of packages,
are important factors in the manufacturability and testability of PCBs.
The
SMD summary action uses the inspected outer layers as well as associated solder
mask layers to determine the SMD lands and packages statistics, and
solderability parameters such as stripe and annular ring. It also check annular
rings and stripes measurements, size of SMD row, if SMD rows fit SMD area, if
pads are too small and need staggering, or if pitch is non-uniform and other
criteria.
The
SMD Summary action uses dynamic category names to report annular ring and
stripe measurements in conjunction with size and stripe value combinations.
The
general structure of a category name is:
This
stores all the stripe measurements for the 19 mil pitch 11 mil pad width SMD
rows.
This attribute
should be attached to outer layer pads that are lands for SMD components. It
is set by the `Set SMD Attribute' Cleanup action. |
*
Only layer name attributes are created
and not total run attributes. Total numbers are meaningless in this context.
The
SMD Summary action generates two special reports.
1. SMD Summary Report lists the manufacturability parameters for
every pair of pitch and pad width values, including the following:
2. Stripes (spacing between adjacent solder mask openings for pads)
both min and max values
3. Annular rings of SMD pads versus their SM clearances
4. Spacing between adjacent SMD pads
5. Packages Summary Table lists data regarding SMD packages
(components) detected in inspected layers. For each package type detected, the
following information is listed:
7. Number of pads in each package
8. Number of rows in each package
9. Minimum and maximum values of the pad widths and lengths
Two sample reports
produced for top and bottom layers of an actual board are provided below:
*********************************
Pitch
|Max Pad| Stripe | Annular ring | Spacing
Size
| Size | min | max | min | max |
---------------------------------------------------------
19.0|
11.0| 1.7| 3.0| 2.5| 2.8| 8.0
50.0|
30.0| 14.0| 14.0| 3.0| 3.0| 20.0
70.0|
50.0| 14.0| 14.0| 3.0| 3.0| 20.0
75.0|
45.0| 24.0| 24.0| 3.0| 3.0| 30.0
100.0|
60.0| 34.0| 34.0| 3.0| 3.0| 40.0
Num
of |Rows in| Pad Width | Pad Length |Pitch | Num of Pads
Packages|Package|
min | max | min | max | Size | in Package
-----------------------------------------------------------------
1
| 1 |50.0 |50.0 |70.0 |70.0 |70.0 | 6
1
| 1 |30.0 |30.0 |50.0 |50.0 |50.0 | 8
1
| 1 |35.0 |35.0 |45.0 |45.0 |75.0 | 16
1
| 1 |46.0 |46.0 |60.0 |60.0 |100.0 | 16
1
| 1 |46.0 |46.0 |60.0 |60.0 |100.0 | 18
1
| 1 |11.7 |11.7 |50.0 |50.0 |19.7 | 24
1
| 1 |11.7 |11.7 |50.0 |50.0 |19.7 | 25
1
| 1 |11.0 |11.0 |60.0 |60.0 |19.7 | 27
1
| 1 |11.0 |11.0 |60.0 |60.0 |19.7 | 28
1
| 1 |30.0 |30.0 |105.0 |105.0 |50.0 | 30
1
| 1 |11.7 |11.7 |50.0 |50.0 |19.7 | 50
1
| 1 |30.0 |30.0 |105.0 |105.0 |50.0 | 100