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LDC1612: Confirm some features

Dillen Chen
Intellectual 2820 points
Part Number: LDC1612

Hi Team,

Customer want to know some features about LDC1612. Could you please give us some comment?

1. The relationship between coil size and test distance. The relationship between distance, coil radius and precision. 

2. If there is a heat source around, will it affect the normal operation of the sensor?

3.Need the sensor be used to fixed by plastic screws and can it be fixed with metal screws?

4.Will the metal around the coil cause interference?

  • 0
    TI__Mastermind 18545 points

    Hello, 

    1. The sensing distance is based on the sensor coil's outer diameter. For a larger coil size, you will be able to sense farther. Additionally, for a given coil size, you will have more resolution closer to the coil than you do farther away from it. As a general rule, we recommend keeping your target distance between 3% and 20% of the coil diameter for high resolution applications, between 20%-50% for medium resolution, and between 50% and 100% of the coil diameter for low resolution applications
    2. Temperature changes can cause drift in the sensor measurement. One way to mitigate this is to use a C0G capacitor which is more stable of temperature. Additionally, if you have an unused channel in the device, you can use that channel to implement a reference sensor that shows only the change due to the environment instead of the normal sensor being impacted by the environment and the intended target. 
    3. It depends on where the screws are in relation to the sensor. If there is enough space between the sensor coil and the screws, then there is not any issue. If you have metal screws, be sure to place them a distance of at least 30% of the sensor coil away from the edge of the coil. 
    4. Metal directly behind the sensor can decrease your ability to detect the intended target. If the intended target is closer than the metal behind the sensor, then there is generally not an issue. If your metal is just off to the side like the screws you mentioned above, then it does not have as much of an impact. 

    Best Regards, 

    Justin Beigel

  • 0 in reply to Justin Beigel
    Prodigy 80 points

    Hello Justin,

      could you give a specific absolute accuracy for the high/medium/low resolution. 

      For example, I use LDC1612 to measure the distance of an object, what are the corresponding values of these three precisions?

      looking forward to your reply.

  • 0 in reply to max chen
    TI__Mastermind 18545 points

    Hello, 

    The exact numbers depend on the sensor coil design and device register settings. I would recommend starting with how much space is available to create a sensor coil or how much accuracy is needed in the system to help design the coil. Our LDC devices can be optimized to achieve um levels of accuracy with the right coil design/implementation but that kind of accuracy is not always required. We have our LDC calculation spreadsheet available to assist with designing a coil and generating recommended device settings for specific devices. 

    Best Regards, 
    Justin Beigel