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LDC0851: Query regarding design in multiple layers.

Part Number: LDC0851

Hi,

I want to used LDC0851HDSGR in our design with 2 sense coil in our 22 layers PCB design. Reference coil and sense coil are not stacked and sense coil to be made at the diagonal end on the PCB. I have some query which are as follows:-

1) For 22 layers PCB, we will make coils in top and bottom layers only and remove the copper plane and traces from all in between layers. Please let us know if it is OK or it will have any issue?

2) If it is OK then please let us know how to design coil and what should be the minimum separation of sense coil / trace between sense coil  to all other traces.

Regards

Santosh Kr. Singh

  • Hello Santosh, 

    You can use our LDC Calculator Tool to see the impact of having a larger space between the coils of a sensor. Just input your coil design as a 2 layer design and set the PCB thickness between the two layers to the thickness of your PCB. 

    There are no issues with having additional layers between them as long as the layers don't have any components or traces between the coils and the sensor design is still valid for the device. In general, we recommend keeping other components a distance of 30% of the coil diameter away from the sensors. 

    See the Sensor Design for Inductive Sensing Applications Using LDC (Rev. C) app note for more information on coil design. 

    Best Regards, 

    Justin Beigel