Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC0851


Design files


An inductive sensing based incremental encoder knob design can provide a robust and low-cost interface for control inputs.  It can reliably operate in environments which have dirt, moisture, or oil which would pose issues for alternate sensing technologies. This solution requires no magnets.

  • High reliability, contactless, encoder implementation suitable for dirty, wet, and other challenging environments
  • Scalable to support multiples of 4 positions/rotation
  • Minimal MCU requirements
  • No permanent magnets required; operates effectively even with magnetic or electrical environmental interference
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUBG5.PDF (2281 K)

Reference design overview and verified performance test data

TIDRL08.PDF (282 K)

Detailed schematic diagram for design layout and components

TIDRL09.PDF (215 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRL10.PDF (178 K)

Detailed overview of design layout for component placement

TIDRL12.ZIP (554 K)

Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDRL11.PDF (1195 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

ESD protection diodes

TPD2E001Dual 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

Data sheet: PDF | HTML
Inductive sensor AFEs

LDC0851Differential inductive switch for MCU-less applications

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

LP5951150-mA, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430F550025 MHz MCU with 8KB Flash, 4KB SRAM, comparator, DMA, UART/SPI/I2C, USB, timer, HW multiplier

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide LDC0851 Incremental Rotary Encoder Design Guide Jan. 28, 2016
Application note Incremental Rotary Encoders (Rev. B) PDF | HTML Dec. 02, 2021

Related design resources

Reference designs

TIDA-00508 1-Degree Dial Reference Design Using the LDC1314 Inductance-to-Digital Converter TIDA-00615 Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC1312/LDC1314

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