Inductive Touch Stainless Steel Keypad Reference Design for Waterproof/Noise Immune HMI Applications


Design files


This 16-button stainless steel keypad, which utilizes TI's inductive touch technology, demonstrates highly sensitive buttons on a single piece of 0.6mm thick stainless steel metal.  The design utilizes a MUXed approach to implement many buttons with a single LDC1614. The design is applicable to any metal or non-metal surface completely enclosing the system, enabling a sleek waterproof (IP67) design.

  • Completely enclosed design with 0.6mm thick stainless steel panel as the button interface
  • High sensitivity to measure metal movement in the sub-micrometer resolution
  • Measures force applied to implement multiple functions on a single button
  • Robust contactless design immune to water, dirt, dust, and other environmental contaminants
  • Low-cost design using PCB coils as the sensor
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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.

TIDUCR1.PDF (6183 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

TIDRRX2.ZIP (1443 K)

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


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


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


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

TIDRRX1.PDF (2312 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog switches & muxes

TS3A50173.3-V, 4:1, 2-channel general-purpose analog multiplexer

Data sheet: PDF | HTML
ESD protection diodes

TPD4E004Quad 1.6-pF, 5.5-V, ±8-kV ESD protection diode with VCC pin for High Speed Interfaces

Data sheet: PDF | HTML
Haptic motor drivers

DRV2605LHaptic driver for ERM/LRA with 2-V operation, waveform library & auto-resonance tracking

Data sheet: PDF | HTML
Inductive sensor AFEs

LDC16144-Ch, 28-bit, high-resolution Inductance to digital converter

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

LP2985-N150-mA, 16-V, 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

Technical documentation

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Type Title Date
* Design guide Inductive Touch Stainless Steel Keypad Reference Design Jul. 26, 2017
Certificate TIDA-01102 EC Declaration of Conformity (DoC) Oct. 25, 2017

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