Smart lighting & backlight control by ambient light & noise-immune proximity sensor reference design


Design files


This reference design demonstrates a proximity sensor implementation for HMI applications. The design can be used for backlight control that dynamically adjusts LCD backlight brightness relative to environment ambient light levels. A capacitive proximity sensor saves power and increases LCD backlight life by waking up the system from sleep or standby mode when a person approaches.

  • Demonstrates EMI-resistant proximity detection using copper PCB material
  • Excellent human-eye spectral response matching a strong IR rejection (<1%)
  • Dynamically adjusts backlight brightness on a logarithmic scale based on how the human eye perceives brightness
  • Integrated UV filter enables good performance for outdoor applications
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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.

TIDUB42B.PDF (8635 K)

Reference design overview and verified performance test data

TIDRJ28B.PDF (690 K)

Detailed schematic diagram for design layout and components


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

TIDRJ30B.PDF (263 K)

Detailed overview of design layout for component placement

TIDRJ31A.PDF (448 K)

Detailed overview of design layout for component placement

TIDRJ33B.ZIP (692 K)

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


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

TIDRJ32B.PDF (2128 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Light sensors

OPT3001Digital ambient light sensor (ALS) with high-precision human-eye response

Data sheet: PDF | HTML
Backlight LED drivers

LM3630ALM3630A high-efficiency dual-String white LED driver

Data sheet: PDF | HTML
ESD protection diodes

TPD2E2U06Dual 1.5-pF, 5.5-V, ±25-kV ESD protection diode with 5.5-A 8/20-uS surge rating for USB 2.0

Data sheet: PDF | HTML
Humidity sensors

HDC1000Low Power, 3% Accuracy Digital Humidity Sensor with Integrated Temperature Sensor

Data sheet: PDF | HTML
Humidity sensors

HDC1010±2% low-power digital humidity and temperature sensor in WCSP

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

TLV713P150-mA, capacitor-free low-dropout voltage regulator with active output discharge & enable

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR596916 MHz MCU with 64KB FRAM, 2KB SRAM, AES, 12-bit ADC, comparator, DMA, UART/SPI/I2C, timer

Data sheet: PDF | HTML
Signal conditioners

FDC22122-Ch, 28-bit, capacitance to digital converter

Data sheet: PDF | HTML

Start development


Support software

TIDCCJ0 TIDA-00754 Ambient Light Sensing

Technical documentation

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Type Title Date
* Design guide Smart Lighting Control by Ambient Light and Noise-Immune Proximity Design Guide (Rev. B) May 20, 2016

Related design resources

Reference designs

TIDA-00220 Capacitive-Based Human Proximity Detection for System Wake-Up & Interrupt Reference Design TIDA-00373 Backlight and Smart Lighting Control by Ambient Light and Proximity Sensor Reference Design TIDA-00466 Noise-immune Capacitive Proximity Sensor System Reference Design TIDA-01364 Smart Backlight Control by White LED Driver, Ambient Light, and Proximity Sensor Reference Design

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