SI1102 Datasheet, PDF (1/16 Pages) Silicon Laboratories – OPTICAL PROXIMITY DETECTOR

Si1102
OPTICAL PROXIMITY DETECTOR
Features
 High-performance proximity
 High EMI immunity without
detector with a sensing range of up shielded packaging
to 50 cm
 2 to 5.25 V power supply
 Single-pulse sensing mode for low  Operating temperature range:
system power
–40 to +85 °C
 Adjustable detection threshold and  Typical 10 µA current consumption
strobe frequency
and ultra-low power of 1 mA typical
 Proximity (PRX) status latch
 Current driven (400 mA) or
enables controlling devices to
saturated LED driver output
avoid missing a detection
 Small outline: 3x3 mm (ODFN)
Pin Assignments
Si1102
ODFN
PRX 1
TXGD 2
TXO 3
DNC 4
8 VSS
7 FR
6 SREN
5 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
Product
Case
Infrared
emitter
Reflectance-Based Proximity Detection
IR
FR
VDD
Signal
processing
PRX
SREN
Hi-Lo
Threshold
Output
Oscillator
Shutdown
control
LED
Drive
TXO
VSS
Rev. 1.0 11/10
Copyright © 2010 by Silicon Laboratories
Si1102