Smart Backlight Control by White LED Driver, Ambient Light, and Proximity Sensor Reference Design


Design files


This reference design conserves power and extends LCD backlight life by dynamically adjusting the LCD backlight brightness relative to the environment's 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
  • Human eye spectral response matching with strong infrared (IR) rejection (<1%)
  • Dynamically adjusts backlight brightness on logarithmic scale based on how the human eye perceives brightness
  • Even LED illumination controlled through white-LED driver PWM without calibration
  • Integrated backlight UV filter enables good performance in 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.

TIDUCG5.PDF (8629 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

TIDROW5.ZIP (1082 K)

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

TIDCCY1.ZIP (1768 K)

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

TIDROW4.PDF (1812 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Backlight LED drivers

TPS61165High brightness white LED driver in 2mm x 2mm QFN Package

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

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

Data sheet: PDF | HTML
Light sensors

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

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

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Technical documentation

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Type Title Date
* Design guide Smart Backlight Control by White LED Driver, Ambient Light, and Proximity Sensor Nov. 22, 2016

Related design resources

Reference designs

TIDA-00373 Backlight and Smart Lighting Control by Ambient Light and Proximity Sensor Reference Design TIDA-00754 Smart lighting & backlight control by ambient light & noise-immune proximity sensor reference design

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