Design your sensor coil and start your system design in seconds

 

If you know axial distance and resolution for your application use Inductive Sensing Designer

 

If you know the inductance required for a fully-custom PCB coil, use Coil Designer

WEBENCH® Inductive Sensing

WEBENCH® Inductive Sensing design tools support TI’s ground-breaking family of inductance-to-digital converter (LDC) products and provide two methods for PCB coil design. LDCs use coils and springs as inductive sensors to deliver higher resolution, increased reliability, and greater flexibility than traditional sensing solutions at a lower system cost. The WEBENCH LDC design tools consist of Inductive Sensing Designer and Coil Designer to enable quick and easy generation of custom PCB coils for your inductive sensing applications. Both tools allow you to export your custom coil into your preferred PCB CAD environment.

Use Inductive Sensing Designer for axial position sensing applications and to generate PCB coils with your specific measurement and resolution needs. Use the interactive Coil Designer for additional coil customization with input parameters such as shape, size, and number of turns to directly compute performance parameters such as inductance and Q.

Which tool is right for you?

Feature WEBENCH® Inductive Sensing Designer WEBENCH® Coil Designer
Enter max sensing distance  
Enter desired resolution  
Enter coil shape  
Helps you select the best sensing IC  
Export coil to CAD tools
Automatically designs coil and calculates resolution  
Enter coil diameter, trace width and trace spacing  
Generates inductance  

Step by Step: Inductive Sensing Designer

Axial sensing made easy!

  • SELECT the appropriate LDC configuration and sensing coil design based on your needs
    • Use the Visualizer to see tradeoffs for resolution, size, number of PCB layers, and distance
  • CREATE a design including the PCB coil in seconds
  • ANALYZE your design's behavior for resolution, inductance, and impedance right in the tool
  • EXPORT your optimized PCB coil design directly into your CAD program

Design your coil

Input your design requirements into the tool to obtain a list of PCB coil solutions tailored to your resolution requirements at a pecified distance. These coil solutions have different diameters resulting in varying inductance values, thus making it possible to achieve a wide range of resolutions for the selected coil solution. All the necessary parameters to choose the appropriate coil are listed in the solutions table.

Advanced Charting on the left provides a way to visualize the trade-offs between these solutions. For example, when X axis represents Resolution @ Distance, Y axis represents Footprint of coil and Bubble size represents Number of layers of PCB coil, it is apparent that as resolution requirements get more stringent, the solution footprint would increase, (top left corner of the chart) and vice versa. Its also clear that a solution with 4 layers (larger bubble size) uses a significantly smaller footprint to achieve the same resolution as a 2-layer solution -- a 4-layer solution has 4 PCB inductor coils in series while a 2-layer solution has only 2 coils in series.

Design your coil

Create your coil

Create the PCB coil design by clicking the "open design" button corresponding to your selected coil solution. The design includes a bill of materials, a list of parameters, charts to help you analyze the solution, PCB coil image, and finally the ability to export the PCB coil to your CAD tool of choice.

Create your coil

Analyze your coil

Analyze the coil solution by interpreting the inductance vs distance, resolution vs distance, and Rp (impedance) vs distance graphs. Analysis provides an understanding of how the inductance and impedance of the coil vary as the distance changes between the target metal and the coil itself. It also provides an estimate of resolution of measurement in microns that you could expect at a given distance.

Analyze your coil

Visualize your coil

Visualize all of the layers of the PCB coil before exporting the coil to your CAD tool.

Visualize your coil

Export your coil design

Export the coil into one of 5 popular CAD tools shown here and you're ready to generate your gerber files.

Export your coil design

Step by Step: Coil Designer

Design your sensor coil, calculate inductance, and export the PCB

Coil Designer is an interactive design tool in which the coil size, shape, number of turns and other parameters can be adjusted to optimize the sensor design to fit a specific need. Select your desired coil shape in the top left pull-down menu – circular, square, hexagonal, or octagonal. Enter and adjust sensor parameters on the lower left section of the screen. See the sensor characteristics change based on your adjustments in the middle of the screen. Your customized sensor design can be exported to a variety of output formats on the right.

General design sequence:

  1. Determine the maximum size inductor that can physically be used in the application, and set the Dout value to that size.
  2. Based on the PCB manufacturing rules, set:
    • Trace width and space to the minimum permitted, typically 4mils (0.1mm) or 6mils (0.15mm)
    • Copper thickness, typically 1oz-cu (~35µm). Thicker is better.
  3. Set the number of layers to match the number of board layers in your design.
  4. Set the Capacitance – the range of 500pF to 2nF is typically near the optimum unless a specific sensor frequency is needed. Adjust the capacitance as needed if your sensor frequency is not within the device limits.
  5. Set the number of turns so that the ratio of Din/Dout is >0.3.
  6. Export custom design into your desired format.

Step by Step: Coil Designer

1. Select the Coil Shape

Based on need select the coil shape - choices include Square, Circular, Hexagonal and Octagonal shapes.

Select coil shape

2. Select the Coil Geometry

Change the coil parameters such as layers, turns, shape, trace width and more. Use the text box to enter your required values or adjust the step increment options.

Select coil geometry

3. Analyze Coil Design Output

Analyze coil output parameters such as coil inductance, diameter, Q factor and more, as shown in the grid for corresponding input values. The Graph between different parameters provides an understanding of how the inductance and other parameters vary with different inputs.

Click on ‘More Data’ to see more output and input parameters and use for deeper coil analysis.

Analyze coil design output

4. Export Coil Design

Export the coil in one of 5 popular CAD tools then you can generate your Gerber files. Export coil option is currently supported for 2 and 4 layers.

Export coil design