Si1102 Optical Proximity Detector Description Features The Si1102 is a high-performance (0-40 cm) active proximity detector. Because it operates on an absolute reflectance threshold principle, it avoids the ambiguity of motion-based proximity systems. To achieve maximum performance, high optical isolation (less than 10-6 coupling) is required between two millimeter-sized light ports, one for the transmit LED and the other for the Si1102. For reduced-range applications (~10 cm), existing holes with high optical loss in a product case may be reused as optical ports, such as display windows, illumination light piping, camera windows, infrared receiver windows, or headphone/microphone holes. The detector even works without a dedicated window if a semi-opaque plastic case is used. 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 measuring the reflected light from a strobed, optically isolated LED. The standard package for the Si1102 is an 8-pin ODFN. - High-performance proximity detector with a sensing Human Interface Products range of up to 40 cm - Threshold reflectance principle overcomes ambiguity associated with motion-based systems - Adjustable detection threshold and strobe frequency - Proximity (PRX) status latched between consecutive - strobes High EMI immunity without shielded packaging Power supply: 2.0-5.5 V Operating temperature range: -40 to +85 C Typical 10 A current consumption Current driven (400 mA) or saturated LED driver output Cancels dc ambient of at least 100 klux (direct sunlight). Small outline: 3 x 3 mm (ODFN) U.S. Patents 5,864,591 and 6,198,118 (others pending) Applications - Proximity sensing Photo-interrupter Occupancy sensing Touchless switch Object detection Handsets Copyright (c) 2009 by Silicon Laboratories 5.18.09 Si1102 Optical Proximity Detector Selected Electrical Specifications (TA = -40 to +85 C unless otherwise specified) Parameter Supply Voltage Conditions Min Typ Max Units -40 to +85 C, VDD to VSS 2.0 3.3 5.5 V -40 -- 85 C Operating Temperature Peak to Peak power supply noise rejection VDD = 3.3 V, 1 kHz-10 MHz no spurious PRX or less than 20% reduction in range 50 mVPP on VDD DC Ambient light (Edc) VDD = 3.3 V 100 klux 1.0 A IDD Shutdown SREN = VDD, FR = 0, VDD = 3.3 V 0.1 IDD average current SREN = 0 V, FR = 0, VDD = 3.3 V 120 A IDD average current SREN = 0 V, FR = open, VDD = 3.3 V 3 A VDD = 3.3 V, 880 nm source 1 W/cm2 Min. Detectable Reflectance Input Pin Assignments 8-Pin ODFN Package Si1102 ODFN-8 PRX 1 8 VSS TXGD 2 7 FR TXO 3 6 SREN NC 4 5 VDD Symbol A b D D2 e E E2 L aaa bbb ccc ddd Min 0.55 0.25 1.40 2.20 0.30 Millimeters Typ 0.65 0.30 3.00 BSC. 1.50 0.65 BSC. 3.00 BSC. 2.30 0.35 0.10 0.10 0.08 0.10 Max 0.75 0.35 1.60 2.40 0.40 Product Family Part Number Pkg LED Drivers LED Drive Methods Range Rate Control Sensitivity Control Si1102-A-GM ODFN-8 1 Current Driven (400 mA), Saturated 40 cm External resistor External resistor Human Interface Products Copyright (c) 2009 by Silicon Laboratories Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders. 5.18.09