LDC1612: Sensing distance, resolution and coil shape

Hi Key,

Thanks for reaching out, a rectangular shaped sensing coil is typically used for linear position measurement along a track. Its not clear to me in what axis your target will be moving. You can use the design calculator in the product folder linked below with the given distances and sensor shape to calculate you required sensor design to give you best results in your application.

https://www.ti.com/product/LDC1612-Q1

1. Is this enough sensing distance considering the coil size?

• This can be calculated in the excel design calculator.

2. Does the thickness of the steel plate affect the distance?

• Yes, recommendation is to have at least 3 skin depths target thickness for a good LDC measurement. This can be calculated based on material type in "SkinDepth" tab of the excel calculator. Further explained in section "1.2.2 Skin Effect" of the Sensor design file linked below.

3. I think you do not provide a design option in a rectangular shape, so would I just stretch the square shape to the side?

• Genreal design guidelines are given here: https://www.ti.com/lit/an/snoa930b/snoa930b.pdf?ts=1597684627403&ref_url=https%253A%252F%252Fwww.google.com%252F
• The excel calculator tool can be changed to "Racetrack" for a rectangular sensing coil in "Sensor Shape field"