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