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LDC0851: About　using　of　LDC_coil_evm

HIROAKI YOSHIDA
Intellectual 290 points
Part Number: LDC0851
Other Parts Discussed in Thread: LDC1612, LDCCOILEVM, ,

Thank you very much for your help.
There are coils with the same specifications (coils B and C, coils D and F) in LDC_COIL_EVM, but please tell me how to use them.

What I imagine is that the same coils can be used in multiple ways to detect a large object.

In this case, do we use a LDC1612 or similar device that supports 2-channel sensors as an LDC device, or do we connect two coils in series to increase the inductance for the purpose?

I would appreciate it if you could give me some examples of use.

Thank you very much.
Hiroaki Yoshida

  • 0
    TI__Mastermind 18545 points

    Hello, 

    Coils B, C, D, and F of the LDCCOILEVM board are design for linear sensing applications where the target slides along the length of these coils. See the LDC1612 LDC1614 Linear Position Sensing (Rev. A) app note for more information on these coil designs. 

    Running two channels of a sensor with the same coil is great if you need to compare the value between a sensing coil and a reference, but does not add to the sensing range. This can also be beneficial for a large target if you are concerned about the target not always being parallel to the coils. 

    What are you trying to achieve by putting the two coils in series? Is it additional coverage of the target or are you trying to improve sensing range? We don't have any examples of using two inductors in series like this but you could simulate them using FEMM to see the impact on the magnetic field: Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) (Rev. A). 

    What is the motion and distance you are trying to detect on the large object? 

    Best Regards, 

    Justin Beigel

  • 0
    Intellectual 290 points

    Mr. Mekre

    Thank you very much for your answer.
    I have a basic question: Does the LDC0851EVM assume that there are two sensor coils?
    In that case, two LDC_COIL_EVM boards are required.　In that case, do I need two LDC_COIL_EVM boards?
    Does it require two LDC_COIL_EVM boards?

    Or, even if there is only one sensor coil, is it possible to use an LSENSE side inductive converter and a LREF side inductive converter?
    Or, even if there is only one sensor coil, the LSENSE side inductive converter and the LREF side inductive converter operate in time sharing.
    Or, even if there is one sensor coil, the LSENSE side inductive converter and the LREF side inductive converter operate in time division, so can the sensor coil be shared?

    Please let me know about the operation of LDC0851EVM.
    Thank you very much.

    H. Yoshida

  • 0 in reply to HIROAKI YOSHIDA
    TI__Mastermind 18545 points

    Hello, 

    The LDC0851 does need two identical coils to operate. The LDC0851 performs a comparison between the two sensor values to determine whether a digital output should be high or low. If you were to share a coil between SENSE and REF, the output would never switch since their values would always be the same. This E2E post talks about using two coils from the LDCCOILEVM with the LDC0851EVM and can be used as a reference for this. 

    Best Regards, 

    Justin Beigel