Automotive Capacitive Kick-to-Open Reference Design


Design files


This reference design uses capacitive sensing to detect a kicking motion indicating the user's desire to activate a power lift-gate, power trunk, or power sliding door on an automobile.  Capacitive sensing allows flexible sensor placement and a large kick-sensitive zone. The high-resolution and low power dissipation make this design applicable to automotive hands-free closure systems where gesture detection and low current from the battery are critical.

  • Two high-resolution capacitive sensors
  • Operates from 12V automotive battery
  • Detects kicks for distances up to 50cm
  • Low quiescent current
  • Simple microcontroller interface
  • This reference design is tested and includes hardware, test results, and a getting started guide
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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.

TIDUD21.PDF (3881 K)

Reference design overview and verified performance test data

TIDRS49.PDF (2226 K)

Detailed schematic diagram for design layout and components

TIDRS50.PDF (26 K)

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

TIDRS51.PDF (101 K)

Detailed overview of design layout for component placement

TIDRS53.ZIP (682 K)

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


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

TIDRS52.PDF (485 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Inverting buffers & drivers

SN74LVC1G04-Q1Automotive single 1.65-V to 5.5-V inverter

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

TPS7B69-Q1Automotive 150-mA, off-battery (40-V), high-PSRR, low-IQ, low-dropout voltage regulator

Data sheet: PDF | HTML
Signal conditioners

FDC2212-Q12-Ch, 28-bit, automotive capacitance to digital converter

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Automotive Capacitive Kick-to-Open Reference Design Aug. 09, 2017
Technical article Comparing capacitive and ultrasonic kick-to-open sensing PDF | HTML Sep. 06, 2017

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