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Digital Output, Low Power, Red, Green, and Blue Color
Light Sensor
ISL29120
The ISL29120 is a low power, high sensitivity, integrated red,
green, and blue light sensor with an I 2 C (SMBus Compatible)
interface. Its state-of-the-art photodiode array provides an
accurate red, green and blue spectral response. The ADC is
capable of rejecting 50Hz and 60Hz flicker caused by artificial
light sources. A selectable range allows the user to optimize
sensitivity suitable for the specific application.
ISL29120 is optimized for sensing red, green and blue light
components in an non-infrared environment (fluorescent and
LED lighting). When operating in infrared rich environments, an
external IR blocking filter should be used for accurate
measurements.
In normal continuous operation, the ISL29120 power
consumption is 70μA, which reduces to 0.3μA in power down
mode. In polling mode, the auto-power-down function shuts down
most of the device after each ADC conversion.
The ISL29120 supports both hardware and software interrupts.
The interrupt thresholds are user programmable. The Interrupt
persistency feature reduces false trigger notification.
Designed to operate on supplies from 2.25V to 3.3V and I 2 C supply
Features
? 70μA Operating Current, 0.3μA Shutdown Current
? I 2 C (SMBus Compatible) Output
? Programmable 4, 8, 12 or 16-bits ADC Resolution
? Programmable Interrupt Windows
? Two Optical Sensitivity Ranges
? 2.25 to 3.63V Operating Power Supply
? 1.7V to 3.6V Supply for I 2 C Interface
? 2.0mmx2.1mmx0.7mm 6 Ld ODFN Package
Applications
? Smart Phone, PDA, GPS, Tablet PCs, LCD-TVs, Digital Picture
Frames, Digital Cameras
? Dynamic Display Color Balancing
? Printer Color Enhancement
? Industrial/Commercial LED Lighting Color Management
? Ambient Light Color Detection/Correction
? OLED Display Aging Compensation
from 1.7V to 3.6V, the ISL29120 is specified for operation over the
-40°C to +85°C ambient temperature range.
0.5
RED SENSOR
0.4
BLUE SENSOR
VDD_PULLUP
SMBMaster
VDD
R2
100 ?
0.3
INT
VDD
REXT
SDA
GND
SCL
ISL29120
INT
SDA
SCL
PULL-UP RESISTORS
2.7k ? TO 10k ?
4
6
5
1
3
2
R1
499k ?
C1
1μF
0.2
0.1
0
300
400
500
GREEN SENSOR
600 700 800
900
1000
1100
WAVELENGTH (nm)
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. RELATIVE SPECTRAL SENSITIVITY FOR RED, GREEN AND
BLUE SENSE MODES
May 29, 2012
FN8314.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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