1. correspondence between
Element attributes in the PCB Footprint in orcad
OrCAD correspond Pads
PCB Footprint <================>Part Type
In Pads in:
① add a new device is a part type.
② a part type may correspond to a plurality of packages (such as a line and patch 74ls138 have two packages);
And ③ a plurality of packages may generally correspond part type, such as packages 1206 may correspond to the capacitance of the pcb part type, may also correspond to the resistance part type
Our package component specified in OrCAD schematic Pads in fact corresponds to part type,
A plurality of packages can be specified part type, generated in Figure netlist import principle, the part type corresponding to the first package is loaded into a package design
Description:
Of course, the first package part type may be selected when the corresponding edit part type,
Below,
the use of moving up and down the package can choose which preferentially used when importing Schematic
2. Why does it correspond
Why a part type can correspond to multiple package it?
In fact, this makes sense, for example, we usually use the at24c16 eeprom chip,
Chip manufacturers in the production time may be provided in two packages, such as a packaging two rows of spacing 300mil, another package two rows spacing 100mil
For example, we use the design principles to FIG AT24C16 the chip, the package is set to be AT24C16,
When introduced into the pads, this schematic is AT24C16 package and pads corresponding to the part type at24c16,
The pads in the at24c16 part type corresponding to the two packages (100mil and 300mil),
If we do have 100mil chips in the pads that can be
selected to be 100mil, and part type of package
if only 300mil, you can use this part type of package selected as 300mil! ! !
Elements placed manually pads (strictly speaking, the first part or placing a part type corresponding to the package type):
Eco Toolbar> Add Component to open the following dialog box:
Select the desired
part type
and click the add to put it into your design
If this part type corresponding to a plurality of packages, you can select a suitable package therein (another attribute may be selected for the specified part type package)
When the error type is specified as a part PCB package, the number of package pads need to specify the part number is greater than or equal to the pin type, otherwise it will pop up as follows:
