TSL2550 datasheet(4/21 Pages) AMSCO

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TSL2550

AMBIENT LIGHT SENSOR

WITH SMBus INTERFACE

TAOS029L − OCTOBER 2007

The LUMENOLOGY r Company

www.taosinc.com

Electrical Characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SMBus output low voltage

IO = 50 μA

0.01

VOL

SMBus output low voltage

IO = 4 mA

0.4

Supply current

Active, VSMBCLK and VSMDATA = VDD,

VDD = 3.3 V ± 5%

0.35

0.6

IDD

Supply current

Power down, VSMBCLK and VSMDATA =

VDD, VDD = 3.3 V ± 5%

μA

IIH

High level input current

VI = VDD

μA

IIL

Low level input current

VI = 0

−5

μA

Operating Characteristics, VDD = 3.3 V, TA = 255C (unless otherwise noted) (see Notes 2, 3, 4)

PARAMETER

TEST CONDITIONS

CHANNEL

MIN

TYP

MAX

UNIT

Ch0

Ee = 0

Ch1

ADC count value standard mode

λp = 640 nm

Ch0

639

799

959

counts

ADC count value, standard mode

λp = 640 nm

Ee = 72 μW/cm2

Ch1

counts

λp = 940 nm

Ch0

511

799

1039

λp = 940 nm

Ee = 140 μW/cm2

Ch1

703

Ch0

Ee = 0

Ch1

ADC count value extended mode

λp = 640 nm

Ch0

155

counts

ADC count value, extended mode

λp = 640 nm

Ee = 72 μW/cm2

Ch1

counts

λp = 940 nm

Ch0

155

λp = 940 nm

Ee = 140 μW/cm2

Ch1

139

ADC count value ratio: Ch1/Ch0,

λp = 640 nm, Ee = 72 μW/cm2

0.070

0.106

0.175

ADC count value ratio: Ch1/Ch0,

standard mode

λp = 940 nm, Ee = 140 μW/cm2

0.70

0.88

1.20

λp = 640 nm

Ch0

11.1

Irradiance responsivity standard mode

λp = 640 nm

Ee = 72 μW/cm2

Ch1

1.2

counts/

(μW/

Irradiance responsivity, standard mode

λp = 940 nm

Ch0

5.7

(μW/

cm2)

λp = 940 nm

Ee = 140 μW/cm2

Ch1

cm2)

Fluorescent light source: 300 Lux

Ch0

2.8

Illuminance responsivity standard mode

Fluorescent light source: 300 Lux

Ch1

0.23

counts/

Illuminance responsivity, standard mode

Incandescent light source: 50 Lux

Ch0

counts/

lux

Incandescent light source: 50 Lux

Ch1

(Sensor Lux) / (actual Lux), standard mode

Fluorescent light source: 300 Lux

0.65

1.35

(Sensor Lux) / (actual Lux), standard mode

(Note 5)

Incandescent light source: 50 Lux

0.5

1.5

NOTES: 3. Optical measurements are made using small-angle incident radiation from light-emitting diode optical sources. Visible 640 nm LEDs

and infrared 940 nm LEDs are used for final product testing for compatibility with high volume production.

4. The 640 nm irradiance Ee is supplied by an AlInGaP light-emitting diode with the following characteristics: peak wavelength

λp = 640 nm and spectral halfwidth Δλ

½ = 17 nm.

5. The 940 nm irradiance Ee is supplied by a GaAs light-emitting diode with the following characteristics: peak wavelength

λp = 940 nm and spectral halfwidth Δλ

½ = 40 nm.

6. The sensor Lux is calculated using the empirical formula shown on p. 11 of this data sheet based on measured Ch0 and Ch1 ADC

count values for the light source specified. Actual Lux is obtained with a commercial luxmeter. The range of the (sensor Lux) / (actual

Lux) ratio is estimated based on the variation of the 640 nm and 940 nm optical parameters. Devices are not 100% tested with

fluorescent or incandescent light sources.

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