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參數(shù)資料
| 型號： | TSL2550 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | AMBIENT LIGHT SENSOR WITH SMBus INTERFACE |
| 中文描述： | 常溫與SMBus接口光傳感器 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 147K |
| 代理商： | TSL2550 |
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029 – SEPTEMBER 2002
12
Copyright 2002, TAOS Inc.
The LUMENOLOGY Company
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:
Light Level (lux)
(Ch0 Counts)
(0.46)
(e
(
3.13R)
)
where:
R = (Ch1 Counts) / (Ch0 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.
Table 5 contains a summary of the typical sensor outputs for several common light sources.
Table 5. Sensor Output Summary
LIGHT SOURCE
ILLUMINANCE
(LUX)
CHANNEL 0
(COUNTS)
CHANNEL 1
(COUNTS)
RATIO:
CH1/CH0
LUX per CH0
COUNT
Fluorescent
300
831
68
0.082
0.36
Daylight (shade)
100
895
343
0.38
0.11
Incandescent
50
959
671
0.7
0.052
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
LSB.
Power Supply Decoupling
The power supply lines must be decoupled with a 0.1
μ
F 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSL2550D | 功能描述:環(huán)境光傳感器 Ambient Light Sensor SMBus RoHS:否 制造商:Vishay Semiconductors 工作電源電壓: 峰值波長:570 nm 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:T-1 封裝:Bulk |
| TSL2550D | 制造商:TAOS Inc 功能描述:PHOTODIODE SENSOR AMBIENT LIGHT 制造商:TAOS Inc 功能描述:PHOTODIODE, SENSOR, AMBIENT LIGHT 制造商:TAOS Inc 功能描述:PHOTODIODE; Output Current:10mA; Sensor Output:Digital; Supply Voltage DC Min:2.7V; Supply Voltage DC Max:5.5V; External Depth:4.0mm; External Width:5.3mm; Lead Spacing:1.27mm; Operating Temperature Max:85C; Output Current Max:10mA ;RoHS Compliant: Yes |
| TSL2550D-NON JEDEC | 制造商:TAOS Inc 功能描述:SENSOR AMBIENT LIGHT. SMD |
| TSL2550D-TR | 功能描述:IC AMBIENT LIGHT SENSOR 8-SOIC RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 光學(xué) - 光電探測器 - 環(huán)境光傳感器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 產(chǎn)品變化通告:Product Discontinuation 25/Jun/2012 標(biāo)準(zhǔn)包裝:2,500 系列:- 帶接近傳感器:無 波長:- 電源電壓:1.7 V ~ 2 V 電流 - 暗（標(biāo)準(zhǔn)）:- 電流 - 光（典型值）:- 輸出類型:數(shù)字 - I²C 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UDFN 裸露焊盤 包裝:帶卷 (TR) |
| TSL2550D-TR-CUT TAPE | 制造商:AMS 功能描述:TSL2550 Series 100 kHz 5.5 V Ambient Light Sensor w/ SMBus Interface - SOIC-8 |
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