Inductive Sensing ICs For Metal Detection

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Detect metallic objects without touching is now made simpler with new inductive sensing IC from TI. Since these sensors do not require any physical contact, it is particularly suitable for applications in metal detectors, traffic lights, car washes and a host of automated industrial processes.

As the company claims, the four newly launched LDC1614, LDC1612, LDC1314 and LDC1312 are the world’s first multi-channel LDC converters. According to the press release, “The LDC1612 and LDC1614 are 2- and 4-channel, 28-bit LDCs for inductive sensing solutions, whereas LDC1312 and LDC1314 are 2- and 4-channel, 12-bit LDCs. By integrating up to four channels in a single IC, the LDC1614 family allows designers to distribute sensors throughout a system, while centralising electronics on fewer printed circuit boards (PCBs) while enabling the performance and reliability benefits of inductive sensing to be realised at minimal cost and power.”

TI sensor2

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According to TI, each device in the LDC1614 family comes in 4mm x 4mm size and is easily configured via its I2C interface. The unit price for 1000 quantities order starts from US$ 2.38 (LDC1312) to US$ 4.75 (LDC1614) globally.

The specifications and features for the LDC series is mentioned below:

  • Easy-to-use and minimal configuration required
  • Measure upto four sensors with one IC
  • Multiple channels support environmental and aging compensation
  • Multi-channel remote sensing provides lowest system cost
  • Pin-compatible medium and high-resolution options
    • LDC1312/4: 2/4-ch 12-bit LDC
    • LDC1612/4: 2/4-ch 28-bit LDC
  • Sensing range beyond two coil diameters
  • Supports wide sensor frequency range of 1kHz – 10MHz
  • Power consumption:
    • 35µA Low Power Sleep Mode
    • 200nA Shutdown Mode
  • 3V operation
  • Support internal or external reference clock
  • Immune to DC magnetic fields and magnets
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