Inductive sensing is a non-contact technology that enables the measurement of position, motion, and the properties of metal or conductive materials. It can also detect changes in springs, such as compression, expansion, and deformation. Texas Instruments (TI) has introduced the industry’s first inductive-to-digital converter (LDC), marking a significant advancement in sensor technology. According to Jon Baldwin, product line manager for TI’s sensor signal path, this new class of data converters uses coils and springs as inductive sensors, offering higher resolution at a lower system cost compared to traditional solutions. The LDC also improves reliability, provides greater flexibility, and reduces power consumption.
The LDC1000 model brings several key technical advantages. First, it offers high resolution, with 16-bit resonant impedance and 24-bit inductance level sensing, suitable for sub-micron precision applications. Second, it ensures high reliability by using non-contact sensing, which is not affected by non-conductive contaminants like oil or dust, thereby increasing the lifespan of the equipment. Third, it provides greater flexibility, allowing the sensor to be placed away from the electronics—ideal for areas where PCBs cannot be used. Fourth, it lowers system costs and power consumption, as it uses low-cost sensors and conductive targets without requiring magnets. The LDC1000 consumes less than 8.5mW during normal operation and under 1.25mW in standby mode. Finally, it opens up new possibilities for system designers, enabling unlimited design options. The sensor can be a winding, a PCB coil, a flexible conductive ink coil, or even a spring, while the target can be an existing conductor, compressed foil, or conductive ink on a patch. This versatility supports breakthrough applications in axial, lateral, and rotational sensing, as well as event counting, helping engineers solve complex system challenges creatively.
Designers can now leverage TI’s latest WEBENCH inductive sensing design tool to quickly create custom sensor coils. This online tool streamlines the design process, automatically configuring settings based on the coil’s characteristics, application needs, and system performance requirements. Once optimized, the design can be easily integrated into various CAD platforms, making it simple to incorporate the sensor into the overall system layout. This powerful tool accelerates development and enhances the efficiency of inductive sensing projects.
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