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LX1970 Datasheet(PDF) 4 Page - Microsemi Corporation

Part # LX1970
Description  Visible Light Sensor
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

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Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright
© 2002
Rev. 1.4b, 2005-08-10
LX1970
Visible Light Sensor
PRODUCTION DATA SHEET
I N T E GRA T ED
PR ODUC T S
MEASUREMENT CIRCUIT CONF IGURATIONS
A
A
VDD
VS
ISNK
ISRC
White
LED
Current
Source
LX1970
A
VDD
SRC
IR LED
910nm
LX1970
White
LED
Current
Sources
%
Figure 1 –
Light Current Measurement Circuit
Figure 2 –
IR sensitivity Measurement Circuit
APPLICATION NOTES
LIGHT UNITS
In converting from µW/cm2 to Nits it is necessary to
define the light source. Nits are units for a measurement
of luminance, which is the apparent brightness of an
illuminated flat surface. µW/cm2 is a measurement of
irradiance or the measurement of electromagnetic
radiation flux both visible and invisible. The first step in
the conversion process is to convert irradiance to
illuminance, which essentially involves running the
irradiant flux through a photopic filter. In normal ambient
a photopic curve is used and in dark ambient a scotopic
curve (dark adapted eye) is used. If the light is composed
of only one wavelength, a conversion chart will tell the
conversion factor to convert µW/m2 to lux (lumens/m2).
If more than one wavelength is used, the light spectrum
of the irradiance must be applied to the photopic filter to
determine the resultant illuminance. The most sensitive
wavelength for the normal light adapted human eye is
555nm. At 555nm, the conversion factor is 683 Lux =
1W/m2 = 100µW/cm2. Therefore 14.6µW/cm² = 100 lux
at 555nm.
The next step in the conversion process is to convert
illuminance to luminance. The units for illuminance are lux or
lumens/m2.
The
units
for
luminance
are
Nits
or
lumens/m2/steradian.
Assuming the illuminance falls on a
Lambertian surface which has perfect dispersion and total
reflection, the conversion from lux to nits is 3.14 lux falling on
a Lambertian reflector produces 1 Nit. Therefore 100 Lux will
produce 31.4 Nits.
If the photo sensor had a truly photopic response, it would
produce the same output current for the same number of nits or
lux, regardless of the color of the light. However, because the
match is not perfect, there is still wavelength dependency
particularly at the ends of the visible spectrum.
In the case of the LX1970 the peak photo response is at
520nm, however depending on the light source, what the
human eye perceives as ‘white’ light may actually be composed
of peak wavelengths of light other than 520nm. For instance a
typical fluorescent lamp includes dominant light not only near
550nm but also at 404 and 435nm. Incandescent light sources
such as standard tungsten lights generate substantial IR
radiation out beyond 2000nm.


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