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S i 1120
P ROXIMITY / A MBIENT L IGHT S ENSOR W I T H PWM O UTPUT
Features
Pin Assignments
?
Typically 50 cm meter proximity ? High EMI immunity without
?
range with single pulse
Seven precision optical
measurement modes:
?
?
shielded packaging
Power supply: 2.2–3.7 V
Operating temperature range:
Si1120
ODFN
?? 3 proximity ranges
?? 3 dc ambient ranges
?? 1 calibration mode
?
–40 to +85 °C
Typical 10 μA current
consumption
PRX
TXGD
1
2
8
7
VSS
MD
?
?
?
Low-noise ambient cancelling
circuit allows maximum
sensitivity with 8–12 bit resolution
ALS works in direct sunlight
(100 klux)
Minimum reflectance sensitivity
?
?
?
Programmable 400/50 mA LED
constant current driver output
Allows independent LED supply
voltage
Small outline 3 x 3 mm (ODFN)
TXO 3
STX 4
U.S. Patent #5,864,591
U.S. Patent #6,198,118
6
5
SC
VDD
<1 μW/cm 2
Applications
Other patents pending
?
?
?
?
Handsets
Touchless switches
Occupancy sensors
Consumer electronics
?
?
?
?
Notebooks/PCs
Industrial automation
Display backlighting control
Photo-interrupter
Description
The Si1120 is a low-power, reflectance-based proximity and ambient light
sensor with advanced analog signal processing and analog PWM output.
It includes an integrated differential photodiode, signal processor, and
LED driver. Proximity sensing is based on the measurement of reflected
light from an external, optically-isolated, strobed LED. A separate visible
light photodiode is used for ambient light sensing. The standard package
for the Si1120 is an 8-pin ODFN.
Rev. 1.0 8/10
Copyright ? 2010 by Silicon Laboratories
Si1120
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