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LDC1101: Improved sensing distance.

ERNESTO GALIANO
Prodigy 140 points
Part Number: LDC1101
Other Parts Discussed in Thread: LMP91300, LDC0851,

Hi.
I need to make an inductive proximity switch,with a value Sn of 5mm in M12 standar,flush mode.
I was started with LMP91300,until I saw that it is practically obsolete.
I was continued with LDC0851,I have not a good sensing distance, 3mm over a 9mm ferrite.and less if I put the two ferrites in the inoxidable m12 tube.
I will continue with the investigaton with LDC1101,but in this situation I must to do the question.
From the Sn and  reliability point of view. Wich is better; LDC1101, standar LC tank oscillator with operational amplifier,or simple LC oscillator with transistor and two bobbins?

  • 0
    TI__Genius 17440 points

    Hello,

    In general, using the LDC1101 (or any LDC device) will be more reliable than a discrete solution. This is because the devices are trimmed in production to reduce part-to-part variation and reduce error due to tolerances from various sources, which are not controlled in discrete solutions. Does this answer your question?

    Best Regards,

  • 0 in reply to Kristin Jones93
    TI__Genius 17440 points

    Hello,

    I haven't heard from you in a while, so I'm assuming you were able to resolve your issue. If this is not the case please feel free to reply to this thread or post a new question.

    Best Regards,

  • 0 in reply to Kristin Jones93
    Prodigy 140 points

    Hi Kristin:

    The reliability is one of the problem that we have, the other is the Sn distance, we need 6mm of Sn,in M12 sensor.

    In this moment we have to buy LDC1101 kit,to make prototypes of coils,and to verify the Sn result.

    Where we can see ferrite coil designs for LDC1101,and validation methods of Sn?

    Thank you.

  • 0 in reply to ERNESTO GALIANO
    TI__Genius 17440 points

    Hello,

    The sensing distance is primarily based on the coil design and the target. In general, the LDC devices can sense targets at about 50% of the outer diameter of the sensing coil. Targets that are not highly conductive or that are significantly smaller than the sensor coil will have reduced responses. I highly recommend reading the following two app notes to get started:

    We don't have any ferrite coil designs for the LDC devices. We recommend using PCB coils because they are much easier to customize for a variety of targets. In addition to the two application notes above, we also have the LDC COIL EVM for experimentation and the LDC calculator to aid with sensor design.

    Please note that our LDC devices are not a direct alternative to many industrial inductive sensors. These inductive sensors guarantee a sensing distance for a given module, which we do not do. Our LDC portfolio is meant to be more flexible and work for a wide variety of inductive sensing applications (such as button replacement, encoders, and event counting), not just for proximity detection. We have tools to guide customers to the sensing distance that they need for their custom target and application.

    Best Regards,