Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC1312/LDC1314


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
  • Minimum 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.

TIDUBG4.PDF (3508 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement


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

TIDCBV4.ZIP (3208 K)

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

TIDRKL7.PDF (1406 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Digital demultiplexers & decoders

CD74HC4511High Speed CMOS Logic BCD-to-7 Segment Latch/Decoder/Driver

Data sheet: PDF | HTML
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

LDC13122-Ch, 12-bit, general purpose inductance to digital converter

Data sheet: PDF | HTML
Inductive sensor AFEs

LDC13144-Ch, 12-bit, general purpose inductance to digital converter

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

MSP430F552825 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier

Data sheet: PDF | HTML

Start development



TIDCBV5 TIDA-00615 Firmware

Technical documentation

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Type Title Date
* Design guide LDC1312 Incremental Encoder Knob Design Guide Jan. 28, 2016
Application brief 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

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