Wide-range (120° FoV at 1.6 meters) proximity sensing reference design with immunity to sunlight


Design files


Proximity sensing with wide field-of-view (FoV) is getting more and more popular and important for people detection in many applications. This reference design uses optical time-of-flight (ToF) techniques to build small and cost-effective proximity sensor systems. A single proximity and distance sensor AFE (OPT3101) with three external NIR LEDs, and one photodiode covers a total 120° wide FoV and outputs accurate distance of people activity.

  • 3 NIR emitters support up to 3 zones of detection with a single OPT3101
  • Total system field-of-view (FoV) of 120° is covered by three LED emitters and one photodiode
  • Detection range up to 1.5 meters without lens
  • Adaptive HDR allows measurement insensitive to object color and reflectivity and supports operation under high ambient condition (outdoor and indoor conditions)
  • Proximity sensing and direct distance measurement output with accuracy of ±10% 
  • Exempt group lamp classification LED as emitter
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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.

TIDUEH5.PDF (2562 K)

Reference design overview and verified performance test data

TIDRY72.ZIP (600 K)

Detailed schematic diagram for design layout and components

TIDRY73.ZIP (102 K)

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

TIDRY74.ZIP (142 K)

Detailed overview of design layout for component placement

TIDRY76.ZIP (993 K)

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

TIDCF47.ZIP (4352 K)

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

TIDRY75.ZIP (714 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

TLV702300-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR243316 MHz MCU with 16KB FRAM, 4KB SRAM, 10-bit ADC, UART/SPI/I2C, timer

Data sheet: PDF | HTML
Proximity sensors

OPT3101ToF-based long-range proximity and distance sensor analog front end (AFE)

Data sheet: PDF | HTML
RGB LED drivers

TLC5928316 channel constant current LED driver with pre-charge FET

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide Wide-Range (120° FoV at 1.6 Meters) Proximity Sensing Ref. Des. Sunlight Immunit Dec. 19, 2018

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