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Original question:

LDC2112: LDC 2112 detect distance、material、coil design

LDC2112: Resolution at Different Target Distances

Alex Wu2
Intellectual 260 points
Part Number: LDC2112


Hi Kristin

1. The table is shown to select air for no target, which means that there is no aluminum or copper in the middle? 

If no target(copper and aluminum), does means metal button detect deflection?

2. I saw that the detection distance affects the resolution. Does the number of turns of the coil also affect it? 

3. You suggest using aluminum or copper, so I need to pay attention that the sensor frequency with target interaction cannot exceed 30MHz.

can I ignore sensor operating frequency with no target? because I use copper as a target.

thanks.

  • 0
    TI__Genius 17440 points

    Hi Alex,

    1. Correct, if "Air" is selected as the target then you are simulating the coil's parameters in free space. This is not applicable to your application because you will always have a target above your coil. Without the metal target it's impossible to detect button deflection. Some other applications may have a metal target that moves completely out of the sensing range of the coil.

    2. For button applications, the inner turns of the coil do affect the sensing resolution. For very tiny coils it's recommended to use a large number of turns so that the inductance is large enough for the LDC device to effectively drive.

    3. Yes, you can ignore the sensor frequency without a target. You only need to focus on the sensor frequency when the target is at its maximum distance and the sensor frequency when the button is pressed.

    Best Regards,