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MAX44007
Low-Power Digital Ambient Light Sensor
with Enhanced Sensitivity
Detailed Description
The MAX44007 is an ambient light sensor with integrated
photodiode and ADC with an I 2 C digital interface. To
measure ambient light, the die is placed inside an opti-
cally transparent (UTDFN-Opto) package. A photodi-
ode inside the IC converts the light to a current that is
then processed by low-power circuitry into a digital bit
stream. This is digitally processed and stored in an out-
put register that is read by an I 2 C interface. An on-chip
programmable interrupt function eliminates the need for
continually polling the device for data and results in sig-
nificant power saving.
A package-level optical filter prevents ultraviolet
and infrared from reaching the photodiode. Its opti-
cal response is also designed to match the spectral
response of the human eye. A second photodiode array,
sensitive primarily to the infrared spectrum, is then used
to match flourescent and incandescent light response
from the part.
Two key features of the IC analog design are its ultra-low
current consumption (typically 0.65μA) and an extremely
wide dynamic light range that extends from 0.025 lux to
104,448 lux—more than a 4,000,000 to 1 range. The on-
chip autoranging scheme requires no user intervention
for the gain-range setting.
As darkened glass or translucent materials can be trans-
parent to IR wavelengths while attenuating visible light
by 20–50 times or more, the IC dual-photodiode archi-
tecture can be utilized to compensate for the increased
IR component of incoming light. By allowing the user to
adjust the internal gain settings to compensate for the
dark glass’ profile, the IC excels in challenging low-light
level applications. contact the factory for more details.
The default integration time of the ADC is 100ms, giving
it inherent rejection of 50Hz and 60Hz ripple common in
certain line-powered light sources.
Human Eye CIE Curve and
Different Light Sources
The IC is designed to detect brightness in the same way
as human eyes do. To achieve this, the sensor needs to
have a spectral sensitivity that is similar to that of human
eyes. Figure 1 shows the spectral sensitivity of the IC
and the human eye (CIE curve).
As can be seen, the human eye has its peak sensitivity
at 555nm (green), while that of blue (~470nm) and red
(~630nm) is much lower. The human eye also is blind to
infrared (> 700nm) and ultraviolet (< 400nm) radiation.
Light sources can have similar visible brightness (lux), but
different IR radiation content (because the human eye is
blind to it). The differences in the light spectra affect bright-
ness measurement because some of this infrared radiation
is picked up by silicon photodiodes. For example, light
sources with high IR content, such as an incandescent
bulb or sunlight, would suggest a much brighter environ-
ment than our eyes would perceive them to be. Other light
sources, such as fluorescent and LED-based systems,
have very little infrared content. The IC exhibits good IR
rejection and internal IR compensation scheme to minimize
these effects and give an accurate lux response.
120
100
MAX44007 RESPONSE
80
60
40
20
0
CIE
300
400
500
600
700
800
900
1000
WAVELENGTH (nm)
Figure 1. Spectral Sensitivity of the MAX44007 and Human Eye
6
Maxim Integrated
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