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Panasonic Semiconductor HomeSemiconductor > Products > Opto Electronic Devices > Photo Detectors > Ambient Light Sensors

Ambient Light Sensors

Product Overview

Analog ambient light sensors with built-in photodiode and current amplifier circuit, which controls the display luminosity depending on ambient brightness and so is ideal for mobile equipments requiring low-power consumption. In addition, it has wavelength characteristics close to human relative spectral sensitivity, enabling control close to human eye response.


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Image Sample

PNJ4K01F, PNJ4K11F Image Sample

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Features

  • A single chip integrating photodiode and current-amp. circuits, achieving significant cost reduction and high reliability
  • Minimum operating supply voltage supporting 1.4 V and 1.8 V power supplies
  • Peak sensitivity wavelength: 560nm
  • Output ratio of incandescent lamp/Fluorescent lamp: 1.1(typ.)
  • Small output fluctuation

PNJ4K01F Package

PNJ4K11F Package

PNJ4K01F, PNJ4K11F Packages

Spectral sensitivity independent of ambient environment

This product's spectral sensitivity (e.g., the level to recognize brightness) features the peak value (560 nm) and reaction range (400 nm to 800 nm), which are almost the same as those of typical human spectral sensitivity. These sensitivities don't match in the shape of waveform, however, this sensor is designed not to make difference between incandescent and fluorescent lamps, achieving the spectral sensitivity independent of ambient environment.

Spectral sensitivity graph
Spectral sensitivity graph

Stable output independent of the type of light source.

This product is designed to have almost the same output current values even in either incandescent or fluorescent light source (e.g., the output ratio of incandescent lamp/fluorescent lamp is 1:1) and therefore provides a stable output independent of the type of light source.

Output current vs Illuminance characteristics
Output current vs Illuminance characteristics

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Block Diagram

PNJ4K01F, PNJ4K11F Block Diagram

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Applications

▪ Automatic dimming function for digital TV screen:
Controls the screen brightness according to ambient brightness.


Ambient light sensors: Application for digital TV




▪ Automatic lighting function for lighting equipments:
Turns on/off the lighting according to ambient brightness.


Ambient light sensors: Application for lighting




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Panasonic Semiconductor HomeSemiconductor > Products > Opto Electronic Devices > Photo Detectors > Ambient Light Sensors