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TSL2550 Datasheet(PDF) 11 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

Part No. TSL2550
Description  AMBIENT LIGHT SENSOR WITH SMBus INTERFACE
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Manufacturer  TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]
Direct Link  http://www.taosinc.com
Logo TAOS - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

TSL2550 Datasheet(HTML) 11 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029L − OCTOBER 2007
11
The LUMENOLOGY r Company
r
r
Copyright E 2007, TAOS Inc.
www.taosinc.com
APPLICATION INFORMATION
The TSL2550 is intended for use in ambient light detection applications, such as display backlight control, where
adjustments are made to display brightness or contrast based on the brightness of the ambient light, as
perceived by the human eye. Conventional silicon detectors respond strongly to infrared light, which the human
eye does not see. This can lead to significant error when the infrared content of the ambient light is high, such
as with incandescent lighting, due to the difference between the silicon detector response and the brightness
perceived by the human eye.
This problem is overcome in the TSL2550 through the use of two photodiodes. One of the photodiodes
(channel 0) is sensitive to both 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 light on the
channel 0 digital output. The ADC digital outputs from the two channels are used in a formula to obtain a value
that approximates the human eye response in the commonly used Illuminance unit of Lux. For standard mode:
Light Level (lux) + (Ch0 * Ch1)
0.39
e(*0.181R
2 )
where:
R = Ch1 Counts / (Ch0 Counts − Ch1 Counts)
The formula above was obtained by optical testing with fluorescent and incandescent light sources. The light
level calculated from the formula will be slightly higher than the actual light level for sunlight and will be slightly
lower than the actual light level for composite fluorescent and incandescent light sources.
NOTE:
Please see TAOS application notes for additional information, including implementing a display
brightness control system with the TSL2550, and for a simple implementation of the equation shown
above suitable for use in embedded microcontrollers.
Table 4 contains a summary of the typical sensor outputs for several common light sources.
Table 4. Sensor Output Summary (Standard Mode)
LIGHT SOURCE
ILLUMINANCE
(LUX)
CHANNEL 0
(COUNTS)
CHANNEL 1
(COUNTS)
RATIO:
CH1/CH0
LUX per CH0
COUNT
Fluorescent
297
831
68
0.082
0.36
Daylight (shade)
201
895
343
0.383
0.22
Incandescent
42
959
671
0.7
0.04
Light from 50 or 60 Hz sources, and especially fluorescent lighting, has a high harmonic content. Since the
TSL2550 integrates the ambient light over an approximately 400 millisecond interval (per channel), this light
ripple is typically reduced to less than ¼ LSB.
Power Supply Decoupling
The power supply lines must be decoupled with a 0.1 μF capacitor placed as close to the device package as
possible. The bypass capacitor should have low effective series resistance (ESR) and effective series
inductance (ESI), such as the common ceramic types, which provide a low impedance path to ground at high
frequencies to handle transient currents caused by internal logic switching.


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