DDCEE KiCAD project template

DDCEE KiCAD Library

Name	Path
KICAD_DDCEE_LIBRARIES	/KiCAD_DDC_Library
KICAD_USER_TEMPLATE_DIR	/KiCAD_DDC_Library/templates

Nickname	Library Path	Library Format		Options	Description
DDCEE	${KICAD_DDCEE_LIBRARIES}/symbols/	KiCad			DDC Custom Symbols

Nickname	Library Path	Library Format		Options	Description
DDCEE	${KICAD_DDCEE_LIBRARIES}/footprints	KiCad			DDC Custom Footprints

	Use
TT	type (see table below)
n	Number of pins
fp	Footprint (not required in symbol name)
value	Component value (passives)
mfgr pn	Manufacturer Part Number

Symbol types include but are not limited to:

The DDCEE KiCAD symbol library symbol template has the following default fields defined:

These fields are in addition to the standard KiCAD symbol fields.

These fields are defined in the Ennnn_NAME_PCBA.kicad_sch template file

A PCBA has four design ouputs that completely define the board. These outputs are

Schematic
- The schematic defines all of the components on the bord and how the components are interconnected. This is done in an abstrac way with notional symbols representing components and component connections. The Bill of Material (BoM) is directly tied to the schematic.
PCB layout artwork
- The layout defines the physical implementation of the electronic components and their interconnections on a specific board geometry.
PCB fabrication diagram
- The fabrication diagram defines the manufacturing board. These parameters can include but are not limited to -
  - Layer stackup (including thickness)
  - Copper weight
  - Materials
  - Solder mask color
  - Testing requirements
  - Controlled impedance requirements
PCBA assembly diagram
- The assembly diagram defines specific assembly steps and proceedures. These steps and proceedures can include but are not limited to -
  - Mechanical Parts that need to be installed on the board
  - Coatings
  - Packaging
  - Cuts and jumps
  - ESD handling requirements

Each of these design outputs should be versioned independently.

Schematic
- Component values can be changed and pin compatible direct replacement parts can be substituted without affecting the artwork, fabrication, or assembly requirements.
PCB Layout artwork
- Components can be re-arranged on the board and still adhere to the same schematic, fabrication and assembly parameters.
- If changes in schematic, fabrication, or assembly require a layout change then the layout artwork revision should be incrimented.
PCB Fabrication Diagram
- Fabrication requirements can change without a change in schematic, artwork, or assembly. For instance core materials and thickness can be changed.
- If changes in schematic, layout artwork, or assembly diagram require changes in the fabrication diagram then the fabrication diagram revision should be incrimented.
PCBA Assembly Diagram
- Assembly requirements can change without a change in schematic, layout artwork, or fabrication diagram. For instance a conformal coating could be added or removed or a wave solder process could be changed to a hand solder process.

A change log should be kept for the various design outputs https://keepachangelog.com/en/1.1.0/

Output	Part No	PCB Layer	Revision	Comment
Schematic	Ennnn_SCH	Silk	Variable	Schematic can be changed without spin
Artwork	Ennnn_ART	Etch	Fixed	Artwork change requires spin
PCB Fab Diagram	Ennnn_FAB	Solder Mask	Fixed	PCB fab requires spin
PCBA Assembly Diagram	Ennnn_ASY	Silk	Variable	PCBA can be reworked without spin