Sunday, April 5, 2009

Digital Light Sensor ICs


Block Diagram

The ISL29001 is an integrated ambient light sensor with
ADC and I2C interface. With a spectral sensitivity curve
matched to that of the human eye, the ISL29001 provides
15-bit effective resolution while rejecting 50Hz and 60Hz
flicker caused by artificial light sources.

In normal operation, the ISL29001 consumes less than
300µA of supply current. A software power-down mode
controlled via the I2C interface disables all but the I2C
interface. A power-down pin is also provided, which reduces
power consumption to less than 1µA.

The ISL29001 includes an internal oscillator, which provides
100ms automatic integration periods, or can be externally
timed by I2C commands. Both the internal timing and the
illuminance resolution can be adjusted with an external

Designed to operate on supplies from 2.5V to 3.3V, the
ISL29001 is specified for operation over the -40°C to +85°C
ambient temperature range. It is packaged in a clear 6 Ld
ODFN package.

• Human Eye Response
• Temperature Compensated
• IR Rejection
• 15-bit Effective Resolution
• Adjustable Resolution: 3 Counts to 15 Counts per lux
• Simple Output Code, Directly Proportional to lux
• 0.3 lux to10,000 lux Range
• 50Hz/60Hz Rejection
• I2C Interface
• 2.5V to 3.3V Supply
• 6 Ld ODFN (2.1mmx2mm)
• Pb-Free (RoHS compliant)
ISL29001 datasheet pdf


The TSL2550 is a digital light sensor with a two-wire, SMBus
serial interface. It combines two photodiodes and a companding
analog-to-digital converter (ADC) on a single CMOS integrated
circuit to provide light measurements over an effective 12-bit
dynamic range.

The TSL2550 is designed for use with broad wavelength light
sources. One of the photodiodes (Channel 0) is sensitive to
visible and infrared light, while the second photodiode
(Channel 1) is sensitive primarily to infrared light. An integrating
ADC converts the photodiode currents to Channel 0 and
Channel 1 digital outputs. Channel 1 digital output is used to
compensate for the effect of the infrared component of ambient
light on Channel 0 digital output. The ADC digital outputs of the
two channels are used to obtain a value that approximates the
human eye response in the commonly used unit of Lux.

_ Converts Light Intensity to Digital Signal
_ Infrared Compensation to Approximate
Human Eye Response
_ Companding A/D for Wide Dynamic Range
_ Rejects 50 Hz/60 Hz Lighting Ripple
_ Two-Wire SMBus Serial Interface
_ Single Supply Operation (2.7 V to 5.5 V)
_ Low Active Power (1 mW typ)
_ Power Down Mode
_ Low-Profile Surface-Mount Package
TSL2550 datasheet pdf

Ultra-compact Ambient Light Sensor
BH1720FVC (Digital Output)

a digital output type (BH1720FVC) integrating a 16bit A/D
converter for direct digital output that eliminates the need for
external processing. The advanced features, combined with
a compact package size and shutdown function that limits
power consumption, make them ideal for high performance,
energy-saving backlight adjustment in portable devices of all
types, including compact LCD TVs, mobile phones, portable
gaming consoles, and notebook PCs.
1.Ultra-compact WSOF5 package (1.6mm×1.6mm×0.55mm)
2.Spectral sensitivity close to that of the human eye (peak
sensitivity waveform: 560nm)
3.Sensitivity variability: +/−15%
4.Built-in shutdown function
5.Compatible with 1.8V logic input interface
6.Three output current gain switching levels: 0.57µA/100lx,
5.7µA/100lx, 57µA/100lx (BH1620FVC)
7.Broad light measurement range: 0–100,000+lx (BH1620FVC),
0-65,528lx (BH1720FVC)
8.Wide operating voltage range: 2.4–5.5V (BH1620FVC)
9.Output proportional to brightness
10.I2C bus compatibility (F/S mode)
11.Integrated 16bit A/D converter eliminates the need for
external processing
12.50Hz/60Hz optical noise removal function ensures stable
measurement (BH1720FVC)

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