SI1102-A-GM Silicon Labs

Si1102 OPTICAL PROXIMITY DETECTOR Features Pin Assignments High-performance proximity High EMI immunity without detector with a sensing range of up shielded packaging Si1102 to 50 cm 2 to 5.25 V power supply Single-pulse sensing mode for low Operating temperature range: ODFN system power 40 to +85 C Adjustable detection threshold and Typical 10 A current consumption PRX 1 8 VSS strobe frequency and ultra-low power of 1 mA typical TXGD 2 7 FR Proximity (PRX) status latch Current driven (400 mA) or TXO 3 6 SREN enables controlling devices to saturated LED driver output avoid missing a detection DNC 4 5 VDD Small outline: 3x3 mm (ODFN) Applications U.S. Patent 5,864,591 Proximity sensing Touchless switch U.S. Patent 6,198,118 Photo-interrupter Object detection U.S. Patent 7,486,386 Occupancy sensing Handsets Other patents pending Intrusion/tamper detection Description The Si1102 is a high-performance (050cm) 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 Threshold PRX Output Signal processing Infrared SREN emitter IR FR Product Oscillator Shutdown Case control TXO LED VDD Drive VSS Rev. 1.0 11/10 Copyright 2010 by Silicon Laboratories Si1102 Not Recommended for New DesignsSi1102 2 Rev. 1.0 Not Recommended for New Designs