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10-03-2018, 12:49 PM
Library parts: Devices (Part-1)
The DEVICE is what we actually look up in the library when we are dropping parts onto the schematic. Once we have the symbol and the package we can create the device. Open the library as described above, then left-click on the Device icon (group of four logic gates) and a window will open with a list of the devices already in the library.
In the window labelled New, type in the name of the device you wish to create, then OK. Eagle will ask "Create new device (name you typed in)?"; click OK and a Device editor opens. In the left-hand toolbar, left-click on the ADD icon (logic gate) and a window opens with the symbols available in the library. Scroll down to the symbol you created; left-click; the symbol is on the cursor; cursor to the origin on the symbol field and then left-click where you want it to be. It is preferred not to have the origin of the symbol aligned with any of the pins of the symbol, but sometimes that is how it must be if the symbol is very small.
The default grid for the symbol window is 0.1" and this may not provide the resolution required to accurately drop the symbol. While the virtual symbol is on the cursor, you can change the grid and/or ZOOM in closer, as needed.
REMEMBER: The pins of the symbol MUST fall on the 0.1" grid or the schematic editor will not be able to connect to them.
While the virtual part is on the cursor, you can right-click to rotate it. Left-click to drop the symbol. If the device is actually comprised of multiple sections, you can drop multiple symbols with each left-click. Left-click on the STOP sign to end the ADD function. Left-click on the NEW button on the right side of the Device editor. This will open a window of available packages. Scroll down and select the package you created for this device; left-click and the package name appears in the Package window. Beside its name is a quotation mark under the word "Variant", then there is an exclamation mark in a yellow circle.
Right-click on the package name and then select RENAME; left-click. A text box opens called "Rename package variant"; type in the name of the package. here, you normally type in the name that is already used, but if there are variations you wish to use, type in this alternate name; left-click on OK and the rename appears beside the original name in the list of packages for this device.
Click on the CONNECT button and the Connect window opens. There are three columns showing the Pins of the symbol, the Pads of the package, and the Pin-Pad connections The first Pin is highlighted and the first pad has a virtual highlight. Click on the pad that you want to connect to the highlighted pin. Then left-click on CONNECT. If it happens that all the Pins and Pads are in the order they should be connected to each other, then simply click on CONNECT and each Pin-Pad pairing will appear in the Pin-Pad column.
You can use the DISCONNECT button to change any of the pairings made. Left-click on DISCONNECT, and the highlighted pairing will disappear from the Pin-Pad column and the Pin and Pad will reappear in their respective columns.. Once you are finished connecting the Pins and pads, left-click on OK.
On the schematic, the symbol must have a geographical designation, called its "name". The name for different component types should have a unique prefix letter or letters, as in "R" for resistors, "L" for coils, etc. Left-click on PREFIX and enter the letter that you wish to be the beginning of the geographic designator for this type of component. The prefix can be more than one letter, for example "SMPS" for switch-mode-power-supply modules.
The DEVICE is what we actually look up in the library when we are dropping parts onto the schematic. Once we have the symbol and the package we can create the device. Open the library as described above, then left-click on the Device icon (group of four logic gates) and a window will open with a list of the devices already in the library.
In the window labelled New, type in the name of the device you wish to create, then OK. Eagle will ask "Create new device (name you typed in)?"; click OK and a Device editor opens. In the left-hand toolbar, left-click on the ADD icon (logic gate) and a window opens with the symbols available in the library. Scroll down to the symbol you created; left-click; the symbol is on the cursor; cursor to the origin on the symbol field and then left-click where you want it to be. It is preferred not to have the origin of the symbol aligned with any of the pins of the symbol, but sometimes that is how it must be if the symbol is very small.
The default grid for the symbol window is 0.1" and this may not provide the resolution required to accurately drop the symbol. While the virtual symbol is on the cursor, you can change the grid and/or ZOOM in closer, as needed.
REMEMBER: The pins of the symbol MUST fall on the 0.1" grid or the schematic editor will not be able to connect to them.
While the virtual part is on the cursor, you can right-click to rotate it. Left-click to drop the symbol. If the device is actually comprised of multiple sections, you can drop multiple symbols with each left-click. Left-click on the STOP sign to end the ADD function. Left-click on the NEW button on the right side of the Device editor. This will open a window of available packages. Scroll down and select the package you created for this device; left-click and the package name appears in the Package window. Beside its name is a quotation mark under the word "Variant", then there is an exclamation mark in a yellow circle.
Right-click on the package name and then select RENAME; left-click. A text box opens called "Rename package variant"; type in the name of the package. here, you normally type in the name that is already used, but if there are variations you wish to use, type in this alternate name; left-click on OK and the rename appears beside the original name in the list of packages for this device.
Click on the CONNECT button and the Connect window opens. There are three columns showing the Pins of the symbol, the Pads of the package, and the Pin-Pad connections The first Pin is highlighted and the first pad has a virtual highlight. Click on the pad that you want to connect to the highlighted pin. Then left-click on CONNECT. If it happens that all the Pins and Pads are in the order they should be connected to each other, then simply click on CONNECT and each Pin-Pad pairing will appear in the Pin-Pad column.
You can use the DISCONNECT button to change any of the pairings made. Left-click on DISCONNECT, and the highlighted pairing will disappear from the Pin-Pad column and the Pin and Pad will reappear in their respective columns.. Once you are finished connecting the Pins and pads, left-click on OK.
On the schematic, the symbol must have a geographical designation, called its "name". The name for different component types should have a unique prefix letter or letters, as in "R" for resistors, "L" for coils, etc. Left-click on PREFIX and enter the letter that you wish to be the beginning of the geographic designator for this type of component. The prefix can be more than one letter, for example "SMPS" for switch-mode-power-supply modules.
