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LDC0851: Inductor Sensor Board

Umang Butani
Prodigy 160 points
Part Number: LDC0851
Other Parts Discussed in Thread: LDC1614

Tool/software:

Hello Team, 
I am developing one inductor sensor board and by looking at ref  LDC0851 is look promming. 

But instead of PCB type trace coil we are considering to use Through hole inductor like 22R474C. 
Does this type of mechanism will work? 
Do you have any application note for same? 
Please let us know your response. 

Regards, 
Umang

  • 0
    TI__Mastermind 18545 points

    Hello Umang, 

    This concept is discussed in the following E2E thread but I will also give you a summary of the implications here. 

    https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/538468/surface-mount-smt-inductor-with-ldc0851

    You can get a stable oscillation with a wire wound inductor but the following factors need to be considered: 

    • Tolerance of the inductors
      • If you have variation in the inductor value, then different boards of the LDC0851 may not act the same after production. 
    • Target motion/range
      • The range of the LDC0851 is mostly dependent on the coil diameter so you may see a decreased sensor range when using a through hole inductor. 
      • You may also want to ensure that your target motion interacts with the top of the inductor rather than one of the sides to get the best performance out of it. 

    Best Regards, 
    Justin Beigel

  • 0 in reply to Justin Beigel
    Prodigy 160 points

    Thanks for the link. 
    It helps to get clear idea, 
    However we have requirements of sensing distance around 2-3 CM (~1 Inch) . Is it achievable by LDC0851? 


  • +1 in reply to Umang Butani
    TI__Mastermind 18545 points

    Hello Umang, 

    For the LDC0851, the max switching distance is around 40% of the coil diameter and to have a coil large enough to get a 2-3cm switching distance would a difficult design. To use inductive sensing with that large of a sensing range, I would recommend using the LDC1614 with a 50mm sensor coil diameter. You will have to monitor the data with an MCU since the LDC1614 gives a high resolution digital value based on the sensor coil rather than a switched output. 

    Best Regards, 

    Justin Beigel

  • 0 in reply to Justin Beigel
    Prodigy 160 points

    Hello Justin
    Thanks, we are looking for controller less design, so this may not work for us. 
    So as say 40% of coil diameter, does this mean to scene metal from 1 cm of distance our inductor/coil must be ~2.5cm wide? Interesting! 
     
    We have on potential project and want to design using LDC0851, can you email me at umang.b@aimtron.com 
    i want to discuss some confidential ideas with you to validate our plane before making prototype. 

    Regards, 
    umang

  • 0 in reply to Umang Butani
    TI__Mastermind 18545 points

    Hello Umang, 

    If you have information to share directly, I have sent you a friendship request on this platform. Once you accept it, you can direct message me with your ideas on this site. 

    Best Regards, 
    Justin Beigel