mirror of
git://projects.qi-hardware.com/eda-tools.git
synced 2024-11-05 06:49:42 +02:00
141 lines
3.7 KiB
Plaintext
141 lines
3.7 KiB
Plaintext
*** This is an older draft of the concept - differs sometimes from the way
|
|
things are done in gta02-core. ***
|
|
|
|
|
|
BOM matching
|
|
============
|
|
|
|
BOMs are matched with inventories in the following way:
|
|
|
|
- a .lst file with the BOM is generated by KiCad
|
|
|
|
- using a ruleset, component characteristics are translated to a
|
|
canonical format and default values may be used for unspecified
|
|
characteristics
|
|
|
|
- part catalogs are searched for matches with the canonical component
|
|
descriptions. This yields a list of supplier-specific part numbers
|
|
for each component.
|
|
|
|
Parts can be characterized by either specifying their properties or
|
|
by equating them to another part. E.g., a Digi-Key part may be
|
|
defined as an NXP part which in turn is equivalent to a TI part.
|
|
|
|
- this list is then matched against inventories, using a suitable
|
|
optimization strategy (e.g., prioritize inventories and try to
|
|
pick as many suitable components as possible higher priority ones
|
|
before moving to lower priority ones)
|
|
|
|
E.g., local stock could be the first-level inventory, followed by
|
|
more distant warehouses, followed by distributors, followed by
|
|
manufacturers.
|
|
|
|
Inventories could also include pricing information.
|
|
|
|
- TBD: it would be good if parameters gathered in the matching process
|
|
could be fed back into KiCad (as some sort of annotations, similar
|
|
to the expanded view of schematic symbols), such that under-specifed
|
|
parts yielding mismatches can be spotted by manual review.
|
|
|
|
|
|
Catalog
|
|
=======
|
|
|
|
A catalog contains part characteristics and the reference number(s)
|
|
assigned to them.
|
|
|
|
|
|
Basic syntax
|
|
------------
|
|
|
|
Catalog entries consist of "words" in the sense that each word does
|
|
not contain any whitespace and words are separated from each other by
|
|
whitespace. Whitespace can be included in a word if it is enclosed in
|
|
double quotes.
|
|
|
|
Each entry begins in the first column of a line. If an entry needs
|
|
more than one line, the words on the continuation line(s) must be
|
|
indented by whitespace.
|
|
|
|
Trailing whitespace is ignored, and so are comments beginning with a
|
|
hash mark. Blank lines end any entry and are also ignored.
|
|
|
|
Each catalog entry begins with the part number followed by a part type
|
|
designator.
|
|
|
|
Characteristics have the form <field>=<value>, where
|
|
the fields follow the pattern outlined below. The value is some
|
|
description of the value of that characteristic, typically a number
|
|
and a unit (e.g., 4.7uF) or a name (e.g., X5R).
|
|
|
|
Numbers use a decimal point where necessary. Mantissas are normalized
|
|
such that they fall into the range 1 <= n < 1000. E.g., instead of
|
|
0.1uF, write 100nF. There is no space between number and unit. The
|
|
Omega of Ohm is written as "R".
|
|
|
|
|
|
Fields
|
|
------
|
|
|
|
Each
|
|
|
|
General fields
|
|
- - - - - - -
|
|
|
|
FP Footprint
|
|
H Height (overrides any height implied by footprint)
|
|
TOL Tolerance, with percent sign. Split tolerances are indicated as n/m%
|
|
DSC Free-format description
|
|
|
|
|
|
Resistors
|
|
- - - - -
|
|
|
|
RES Part type designator
|
|
R Resistance, with unit
|
|
P Maximum power dissipation
|
|
V Maximum volatage
|
|
|
|
|
|
Capacitors
|
|
- - - - -
|
|
|
|
CAP Part type designator
|
|
C Capacitance, with unit
|
|
M Material, e.g., TANT, NP0, X5R, etc.
|
|
V Maximum voltage
|
|
ESR ESR, with unit
|
|
|
|
|
|
Inductors
|
|
-- - - -
|
|
|
|
Diodes
|
|
- - -
|
|
|
|
DIODE Regular diode
|
|
STKY Schottky diode
|
|
|
|
Vf Maximum forward voltage
|
|
Vr Maximum reverse voltage
|
|
If Maximum forward current
|
|
Ir Maximum reverse current
|
|
C Capacitance
|
|
|
|
LED Ligh-emitting diode
|
|
|
|
COL Color, multiple colors are separated by /, e.g., blue/red
|
|
ARRAY If multiple diodes form an array, this parameter describes
|
|
its structure: CA = common anode, CC = common cathode,
|
|
SEQ = tap-A-C-tap-A-C-tap sequence
|
|
|
|
ZENER Zener diode
|
|
|
|
Vz Zener voltage
|
|
|
|
TVS Transient voltage suppressor
|
|
|
|
Vac Working voltage, AC
|
|
Vdc Working voltage, DC
|
|
E Energy
|