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S i 1102
O PTICAL P ROXIMITY D ETECTOR
Features
Pin Assignments
?
High-performance proximity
detector with a sensing range of up
?
High EMI immunity without
shielded packaging
to 50 cm
?
2 to 5.25 V power supply
Si1102
?
Single-pulse sensing mode for low ?
system power
Operating temperature range:
–40 to +85 °C
ODFN
?
Adjustable detection threshold and ?
Typical 10 μA current consumption
PRX
1
8
VSS
?
strobe frequency
Proximity (PRX) status latch
enables controlling devices to
avoid missing a detection
?
?
and ultra-low power of 1 mA typical
Current driven (400 mA) or
saturated LED driver output
Small outline: 3x3 mm (ODFN)
TXGD
TXO
DNC
2
3
4
7
6
5
FR
SREN
VDD
Applications
?
?
?
Proximity sensing
Photo-interrupter
Occupancy sensing
?
?
?
?
Touchless switch
Object detection
Handsets
Intrusion/tamper detection
U.S. Patent 5,864,591
U.S. Patent 6,198,118
U.S. Patent 7,486,386
Other patents pending
Description
The Si1102 is a high-performance (0–50 cm) active proximity detector.
Because it operates on an absolute reflectance threshold principle, it avoids
the ambiguity of motion-based proximity systems.
The Si1102 consists of a patented, high-EMI immunity, differential photodiode
and a signal-processing IC with LED driver and high-gain optical receiver.
Proximity detection is based on measurements of reflected light from a
strobed, optically-isolated LED. The standard package for the Si1102 is an 8-
pin ODFN.
Functional Block Diagram
Reflectance-Based Proximity Detection
Hi-Lo
Infrared
Signal
processing
PRX
Threshold
Output
emitter
IR
SREN
Product
Case
FR
VDD
Oscillator
LED
Shutdown
control
TXO
Drive
VSS
Rev. 1.0 11/10
Copyright ? 2010 by Silicon Laboratories
Si1102
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