Altium Annotate Schematics: A Comprehensive Guide

In Altium's schematic editor, annotating schematics is an essential step to ensure clarity and precision in circuit designs. The 'Annotate Schematics' command allows users to configure annotation schemes, set scope of annotation, and assign designators to components in a systematic manner. This article will delve into the process of annotating schematics using Altium's Annotate dialog.

Designator Reference

The first step in annotating schematics is to specify the reference for component locations when determining processing order. This is done by selecting the 'Designator' option from the drop-down list in the Schematic Annotation Configuration region. The associated graphical representation will dynamically update, illustrating how components will be annotated based on the chosen method.

Positional Annotation Methods

Altium provides several methods of positional annotation to choose from, including:

Each method has its own unique benefits and limitations. For instance, 'As You Go' annotation allows users to annotate components as they are added to the schematic, while 'Netlist-Based' annotation uses the netlist to determine component positions.

Proposed Change List

The Proposed Change List region lists the changes that will occur once accepted and executed using an Engineering Change Order (ECO). This feature helps designers track proposed changes and ensures that all designators are updated accordingly.

Schematic Annotation Configuration

The Schematic Annotation Configuration region is where users configure the annotation scheme and scope of annotation. The dialog is partitioned into two primary regions:

* Schematic Annotation Configuration: This region allows users to set Index and Suffix options, as well as Reset Schematic Designators (including any duplicate designators).

* Proposed Change List: This region lists the proposed changes that will occur once accepted and executed using an ECO.

Configuring Annotation Options

Annotation options can be configured to package multi-part components, set Index and Suffix options, and Reset Schematic Designators. Users can also choose to systematically assign designators to all (or selected parts) in selected schematic sheets of a project, ensuring that designators are unique and ordered based on their position.

In conclusion, annotating schematics using Altium's Annotate dialog is a crucial step in ensuring the accuracy and clarity of circuit designs. By specifying the reference for component locations, choosing a method of positional annotation, and configuring annotation options, designers can streamline the annotation process and ensure that designators are unique and ordered correctly.

Altium annotate schematics