Inductive touch and magnetic dial contactless user-interface reference design


Design files


This reference design uses inductive and Hall-effect sensing technologies to provide a human-machine interface. The inductive sensing devices create eight different touch buttons on a seamless surface while the Hall-effect sensor is used to create a magnetic dial that can rotate and be used as an additional button.

Using an inductive sensing touch button provides a robust solution that uses the force of the press to determine a button press. This allows for touch buttons to be used with gloves on while also ignoring environmental factors like dirt or damages to the button surface. The Hall-effect sensor dial creates a contactless rotation that has improved wear and tear over traditional contact-based implementations such as potentiometers or rotary encoders.

  • Seamless touch surface
  • Force touch buttons
  • Contactless magnetic dial
  • Push and rotate dial with one device
  • Integrated CORDIC algorithm

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.

TIDUC26.PDF (1522 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

TIDMAB2.ZIP (2551 K)

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

TIDCG60.ZIP (4947 K)

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

TIDMAB1.PDF (1194 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Inductive sensor AFEs

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Haptic motor drivers

DRV2605Haptic driver for ERM/LRA with waveform library & auto-resonance tracking

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I2C general-purpose I/Os (GPIOs)

TCA9534A8-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, & config registers

Data sheet document-pdfAcrobat PDF open-in-new HTML
I2C switches & multiplexers

PCA9543A2-channel 2.3- to 5.5-V I2C/SMBus switch with interrupt, reset & voltage translation

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TLV755P500-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

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Multi-axis linear & angle position sensors

TMAG5273Low-power linear 3D Hall-effect sensor with I²C interface

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Technical documentation

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* Design guide Inductive Touch and Magnetic Dial Contactless User Interface Reference Design PDF | HTML Apr. 07, 2022

Related design resources

Hardware development

TI-SCB Sensor control board (SCB) for evaluation modules

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