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.
|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|
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.
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.
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.
Visualize your coil
Visualize all of the layers of the PCB coil before exporting the coil to your CAD tool.
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.
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. Select the Coil Shape
Based on need select the coil shape - choices include Square, Circular, Hexagonal and Octagonal shapes.
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.
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.
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.