SNOAA76 August   2021 LDC3114 , LDC3114-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Benefits of Inductive Proximity Sensing
    2. 1.2 Common Applications
    3. 1.3 Human-Machine Interface Design Guide
  3. 2System Considerations
    1. 2.1 Target Properties
    2. 2.2 Sensing Distance
    3. 2.3 LDC3114 Device Features
  4. 3Design
    1. 3.1 Sensor Size and Frequency
    2. 3.2 Linear Sensing Region
  5. 4Measured Raw Data Output
    1. 4.1 Measured Response of LDCCOILEVM Sensor N
    2. 4.2 Measured Response of LDCCOILEVM Sensor R
  6. 5Observed Effects of Ambient Temperature
  7. 6References

4.2 Measured Response of LDCCOILEVM Sensor R

To present a wide range of sensor resonant frequencies, an additional sensor that was used to prototype with the LDC3114EVM was Sensor R. The inductance of this sensor is a midpoint between the EVM sensor and Sensor N, at 1.026 μH with no target present. Sensor R has the following physical properties:

  • Outer diameter: 4 mm
  • Number of turns (per layer): 3
  • Number of layers: 6
  • Trace spacing: 4 mil
  • Trace width: 4 mil

Figure 4-3 shows the raw data and frequency response of Sensor R. After the target reaches 20% of the sensor diameter, 0.8 mm, the frequency response begins to level off.

GUID-C24D6BE2-896E-41DB-BCCC-CCFF3BBE2EC6-low.png Figure 4-3 Measured Raw Data of LDC3114 With Sensor R