Selecting Parts from the Library

Basic Schematic Entry:

We’ll start the tutorial by familiarizing ourselves with the basics of schematic design; picking components from the libraries, placing them on the schematic and wiring them together.

The design in question is relatively large and there is therefore a reasonable amount of drawing involved. We provide a completed schematic at the end of this section so, if you feel that you have mastered the basics at any point, there is no need to continue with drawing the remainder of the circuitry. We do however urge you to read through the full contents of the documentation as we introduce important features throughout.

The first thing we need to do is to get the parts from the libraries that we need in our schematic.

Selecting Parts from the Library:

You can select parts from the library in one of two ways :

  1. Click on the P button at the top left of the Object Selector as shown below. You can also use the Browse Library icon on the keyboard shortcut for this command (by default this is the P key on the keyboard).

 

 

Selecting Parts from the Library

  1. Right click the mouse on an empty area of the schematic and select Place – Component – From Libraries  from the resulting context menu as shown below :

Place – Component

Either of these two methods will cause the Device Library Browser dialogue form to appear.

For reference, the following is a list of all the components we will need for our design:

27N002

24LC64

AVX0805NP022P

AVX0805X7R1N

AVX08055X7R10N

AVX0805X7R100N

B82432T1103K000

BAS40

CHIPRES1k

CHIPRES10K

CHIPRES20K

CHIPRES68K

CHIPRES100K

CHIPRES100R

CHIPRES200K

CONN-H2

CONN-SIL4

CONN-SIL6

CRYSTAL

DSPIC33FJ12GP201

JUMPER

LED-RED

LM285-2V5

LM358

MAX1724

MPX4115

SHT15

TAWD106M025R0600

There are several ways in which we can find and import components from the libraries into the schematic. In the case of parts where you would know the part name its usually best to start the search with that. Try entering ’2N7002’ into the Keywords field on the Device Library Browser dialogue form. This gives a direct result and we can then simply double click on the part in the results list to import it into the schematic. When you do this you should notice that the part now populates the Object Selector as in the following screenshot.

Picking the 2N7002 from the Pick Device form
Picking the 2N7002 from the Pick Device form

Given that we know the names of all the parts we want we could simply proceed by using this technique to bring in all the components we need. However, this may not always be the case and ISIS provides several methods for finding parts in the component libraries. One of the most intuitive is to use the library browser a little like an internet search engine, typing in descriptive keywords and then browsing the results to find a specific part. Try this now with the resistors, typing in ‘1k resistor’ in the keywords field of the library browser dialogue to locate the CHIPRES1K component (double click on the part in the results list to import into the schematic).  We could similarly search for ‘10k SMT resistor’ to find and insert the CHIPRES10k component and so on.

Picking the CHIPRES10K Device form
Picking the CHIPRES10K Device form

You can customize the information displayed in the Library Browser’s results list by right clicking the mouse on the results list. The context menu provides you with options to display Categories, Sub-Categories, Manufacturer and Library alongside each result.

It may be that we simply want to browse for a specific type of part and/or one available from a specific manufacturer. To take an example, clear out the contents of the keyword field and then select the Capacitors Category. In our design we are looking for some Nickel Barrier caps from AVX so we can further filter the results set by selecting Nickel Barrier from the sub-category field and AVX from the Manufacturer field. There are still a large number of caps available so we might type in ‘22p’, ‘1N’, etc. in the keywords field to isolate and select the particular components we require (AVX0805NP022P, AVX0805X7R1N and so on).

Whilst this exercise is a little contrived given that we are starting from a preset list of parts, the techniques described are flexible enough to allow you to locate any library part quickly. Work through the full parts list for the design (as provided above) now using one or more of these methods to find and select the parts into your design. When you are finished you should have all of the required components in the Object Selector as shown in the following screenshot.

List of the components required for the schematic
List of the components required for the schematic

While not directly relevant to this design, an important extension to the standard library techniques discussed above is that you can customize the information displayed in the Library Browser’s results list by right clicking the mouse on the results list. The context menu provides you with options to display Categories, Sub-Categories, Manufacturer, Stockcode and Library alongside each result. This is significant as the keyword search engine will only search through all visible columns.

For example, if you wanted to search for a specific stockcode you would need to make sure that the stockcode column was enabled (right click on results list) and then type something like ‘digi <stockcode>’ to locate the digikey stockcode.

Similarly, if you want to search through only your own library parts, you can simple enable the library field and then type something like ‘user <partname>’; the user term will filter the results to the USERDVC library thus reducing the search range to your own libraries.

 

#collected from the proteus>>help>> tutorial page

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