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LDC1612: Coils design question

GaryC
Expert 3385 points
Part Number: LDC1612
Other Parts Discussed in Thread: LDC1614

What’s the maximum distance that the sensor will reliably work from.

Will the sensor detect a bolt through plastic (in addition to its own housing).

What’s the smallest size the sensor can be (can we go to a smaller battery size).

BR, Gary

  • 0
    TI__Mastermind 18545 points

    Hello Gary, 

    The maximum distance that can be sensed by the LDC1614 is determined by the outer diameter of the inductive sensor coil. For highest resolution, we recommend keeping the target distance between 3% and 20% of the diameter but you can reliably sense all the way to 100% of the coil diameter. Beyond 100% of the coil diameter, noise can become a larger concern and getting an accurate measurement can be difficult. For more information, please see the LDC Introduction TIPL. 

    Yes the sensor can detect metal through plastic. The size of the bolt in comparison to the size of the sensor will also have an impact on how well the sensor will work. See the following post for more information: https://e2e.ti.com/blogs_/b/analogwire/posts/inductive-sensing-target-size-matters. 

    The smallest sensor size is dependent on the sensor frequency. The LDC1614 has a 10MHz limit so you could likely go as low as 3 or 4mm depending on the sensor coil parameters and paired capacitor. 

    Best Regards, 
    Justin Beigel