• Resolved

LDC1312-Q1: Layout Query

Part Number: LDC1312-Q1

Is it ok to make a 4 layer board, with two layers of coil, one layer for ground and one layer for LDC1312 and other components. I want to keep size of the board not more than the size of coil. Is this approach ok? Or do I have to make two separate 2 layer boards and connect the PCB inductor from one board to another using connectors?  

Naveen Bevara

Analog Application Engineer,

Texas Instruments (India) Pvt. Ltd.

  • Hello Naveen,
    Can you post your layout for review? It sounds like you are suggesting covering your coil area with a ground layer and components, which will decrease the sensitivity of the coil.
    Regards,
    Luke
  • In reply to Luke LaPointe:

    Hi Luke, 

    Customer not yet made the layout. He want to understand whether it can be done this way. Two layers of coil facing towards target and rest two layers of traces and components.

     

    Naveen Bevara

    Analog Application Engineer,

    Texas Instruments (India) Pvt. Ltd.

  • In reply to Naveen Bevara:

    Hello Naveen,

    It sounds like the customer wants to do something like:

    This design has many limitations and is far from optimal. The ground plane under the sensor will greatly reduce the Rp and sensitivity. These issues are most pronounced with small sensors (<15mm diameter). It is better to design a PCB where  the sensor is physically offset from LDC and ground plane:

    Regards,

    ChrisO