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PDF TSL2550 Data sheet ( Hoja de datos )

Número de pieza TSL2550
Descripción AMBIENT LIGHT SENSOR WITH SMBus INTERFACE
Fabricantes ETC 
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No Preview Available ! TSL2550 Hoja de datos, Descripción, Manual

t
t
D Converts Light Intensity to Digital Signal
D Infrared Compensation to Approximate
Human Eye Response
D Companding A/D for Wide Dynamic Range
D Rejects 50 Hz/60 Hz Lighting Ripple
D Two-Wire SMBus Serial Interface
D Single Supply Operation (2.7 V to 5.5 V)
D Low Active Power (1 mW typ)
D Power Down Mode
D Low-Profile Surface-Mount Package
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029 – SEPTEMBER 2002
PACKAGE D
8-LEAD SOIC
(TOP VIEW)
VDD 1
NC 2
NC 3
GND 4
8 SMBData
7 NC
6 NC
5 SMBCLK
Description
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.
This device is intended primarily for use in applications in which measurement of ambient light is used to control
display backlighting such as laptop computers, PDAs, camcorders, and GPS systems. Other applications
include contrast control in LED signs and displays, camera exposure control, lighting controls, etc. The
integrating conversion technique used by the TSL2550 effectively eliminates the effect of flicker from
AC-powered lamps, increasing the stability of the measurement.
Functional Block Diagram
VDD = 2.7 V to 5.5 V
Channel 0
Photodiode
Channel 1
Photodiode
Integrating
A/D Converter
Control Logic
Output Registers
Two-Wire Serial Interface
SMBCLK
SMBData
The LUMENOLOGYr Company
t
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205 S Plano, TX 75074 S (972t) 673-0759
www.taosinc.com
Copyright E 2002, TAOS Inc.
1

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TSL2550 pdf
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029 – SEPTEMBER 2002
PARAMETER MEASUREMENT INFORMATION
SMBCLK
t(BUF)
SMBDATA
t(LOW)
t(R)
VIH
VIL
t(HDSTA)
t(HDDAT)
VIH
VIL
t(F)
t(HIGH) t(SUSTA)
t(SUDAT)
t(SUSTO)
P
Stop
Condition
S
Start
Condition
S
Start
Stop
t(LOWSEXT)
SMBCLKACK
SMBCLKACK
t(LOWMEXT)
t(LOWMEXT)
t(LOWMEXT)
SMBCLK
P
SMBDATA
Figure 1. SMBus Timing Diagrams
SMBCLK
1
91
9
SMBDATA
A6 A5 A4 A3 A2 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Start by
Master
ACK by
TSL2550
Frame 1 SMBus Slave Address Byte
Frame 2 Command Byte
ACK by Stop by
TSL2550 Master
Figure 2. SMBus Timing Diagram for Send Byte Format
SMBCLK
1
91
9
SMBDATA
A6 A5 A4 A3 A2 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Start by
Master
ACK by
TSL2550
Frame 1 SMBus Slave Address Byte
NACK by Stop by
Master Master
Frame 2 Data Byte From TSL2550
Figure 3. SMBus Timing Diagram for Receive Byte Format
The LUMENOLOGYr Company
t
www.taosinc.com
t
Copyright E 2002, TAOS Inc.
5

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TSL2550 arduino
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029 – SEPTEMBER 2002
Operation
After applying VDD, the device will initially be in the power down state. To operate the device, issue an SMBus
Send Byte protocol with the device address and the appropriate command byte to read ADC channel 0 or ADC
channel 1 (see Table 2). To obtain the conversion result, issue an SMBus Receive Byte protocol with the device
address. The data byte received will correspond to the value in the ADC register (0 or 1) specified by the previous
command. If a conversion has not been completed since power up (either through VDD or ADCEN/PON), the
valid bit will be 0, and the data will not be valid. If there is a valid conversion result available, the valid bit will
be set (1), and the remaining 7 bits will represent valid data from the previously selected ADC register. Data
may be read repeatedly from the currently selected ADC register, and although it will remain valid, the ADC
register will not be updated until a new conversion completes for that channel (800 ms total since there are two
serial 400 ms per channel conversion times). Note also that the command register itself may be read, as a check
to be sure that the device is communicating properly.
To power down the device for reduced power consumption, issue an SMBus Send Byte protocol with the device
address followed by 0 to clear the ADCEN and PON bits.
The LUMENOLOGYr Company
t
www.taosinc.com
t
Copyright E 2002, TAOS Inc.
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