PCA and PCB

This lesson covers queries specific to printed circuit assemblies (PCAs) and bare printed circuit boards (PCBs).

Distinguishing PCA from PCB

In AP 210 data:

PCB (bare board) - The laminated substrate with copper layers, no components
PCA (populated board) - The PCB with all components assembled

public boolean isBareBoard(E_product product) throws SdaiException {
    String category = getProductCategory(product);
    return category.contains("bare board") || category.contains("pcb");
}

public boolean isAssembly(E_product product) throws SdaiException {
    String category = getProductCategory(product);
    return category.contains("assembly") || category.contains("pca");
}

Board Dimensions

public double[] getBoardDimensions(E_product board) throws SdaiException {
    E_shape_definition_representation sdr = getShapeRepresentation(board);
    E_advanced_brep_shape_representation shape =
        (E_advanced_brep_shape_representation) sdr.getUsed_representation(null);

    // Find the bounding box
    double[] bounds = calculateBoundingBox(shape);
    // Returns [min_x, min_y, min_z, max_x, max_y, max_z]
    return bounds;
}

public double getBoardArea(E_product board) throws SdaiException {
    double[] dims = getBoardDimensions(board);
    double width = dims[3] - dims[0];
    double height = dims[4] - dims[1];
    return width * height;
}

Component Summary

public Map<String, Integer> getComponentSummary(E_product assembly)
        throws SdaiException {
    Map<String, Integer> summary = new LinkedHashMap<>();
    List<E_product> components = getComponentProducts(assembly);

    for (E_product component : components) {
        String type = getComponentType(component);
        summary.merge(type, 1, Integer::sum);
    }
    return summary;
}

Output:

{resistor: 12, capacitor: 8, IC: 3, connector: 2, LED: 4}

Net Statistics

public NetStatistics getNetStatistics(E_product assembly)
        throws SdaiException {
    List<E_physical_connectivity_definition> nets = getNets(assembly);
    NetStatistics stats = new NetStatistics();
    stats.totalNets = nets.size();
    stats.powerNets = 0;
    stats.signalNets = 0;

    for (E_physical_connectivity_definition net : nets) {
        int pinCount = getPinCount(net);
        if (isPowerNet(net)) {
            stats.powerNets++;
            stats.maxPowerPins = Math.max(stats.maxPowerPins, pinCount);
        } else {
            stats.signalNets++;
            stats.maxSignalPins = Math.max(stats.maxSignalPins, pinCount);
        }
    }
    return stats;
}

Board Density Analysis

public double getComponentDensity(E_product assembly) throws SdaiException {
    double boardArea = getBoardArea(getBareBoard(assembly));
    int componentCount = getComponentProducts(assembly).size();
    return componentCount / boardArea; // components per mm²
}